Marine Life Koh Chang (ASIAN PACIFIC)

Discover Koh Chang’s marine life, coral reefs and dive sites we offer daily diving and snorkelling trips to the most popular sites in Mu Koh Chang National Park. There are about 21,000 species of fish on our planet. To classify all these creatures into categories one usually uses the characteristics of the animals. In order to discover as much of the underwater world as possible, we dive slowly and calmly with good buoyancy along the coral reef. At our dive sites, we find different fish families, to distinguish them we have to catalogue the different characteristics of the animals like shape, colour, size, etc. If we can’t identify a fish, we make a sketch and compare it in reference books or ask a specialist. It is important as a snorkeler or diver to note the different changes and report them accordingly. We have compiled an overview of the marine life in Koh Chang for you here.


Mammals include humans and all other animals that are warm-blooded vertebrates (vertebrates have backbones) with hair. They feed their young with milk and have a more well-developed brain than other types of animals.

Dugong Dugon, Koh Chang, Thailand

Dugong Dugon

SIZE: 4m / RARITY: Rare / BEHAVIOR: Indifferent / AGE: 73 Years

hinese white Dolphin, Koh Chang, Thailand

Chinese white Dolphin

SIZE: 3,2m / RARITY: Uncommon / BEHAVIOR: Fearfull / AGE: 50 Years

Irrawaddy Dolphin, Koh Chang, Thailand

Irrawaddy Dolphin

SIZE: 2,8m / RARITY: Rare / BEHAVIOR: Curious / AGE: 28 Years

Spinner Dolphin, Koh Chang, Thailand

Spinner Dolphin

SIZE: 2,4m / RARITY: Uncommon / BEHAVIOR: Fearful / AGE: 50 Years

Sharks & Rays

Sharks and rays are some of the most enigmatic and misunderstood creatures of the ocean. They are crucial for the health of our planet. Sharks and rays help the world, from fighting climate change to sharing food with their neighbors to growing phytoplankton.

Whale Shark, Koh Chang, Thailand

Whale Shark

SIZE: 18m / RARITY: Rare / BEHAVIOR: Indifferent / AGE: 100 Years

Grey Reef Shark, Koh Chang, Thailand

Grey Reef Shark

SIZE: 2,6m / RARITY: Common / BEHAVIOR: Curious / AGE: 25 Years / DANGEROUS: Bite

Blacktip Reef Shark, Koh Chang, Thailand

Blacktip Reef Shark

SIZE: 2m / RARITY: Uncommon / BEHAVIOR: Curious / AGE: 12 Years / DANGEROUS: Bite

Tawny Nurse Shark, Koh Chang, Thailand

Tawny Nurse Shark

SIZE: 3,2m / RARITY: Uncommon / BEHAVIOR: Curious / AGE: Years / DANGEROUS: Bite

Eagle Ray, Koh Chang, Thailand

Eagle Ray

SIZE: 1,5m / RARITY: Rare / BEHAVIOR: Indifferent / AGE: Years

Blue spottet maskray, Koh Chang, Thailand

Blue spottet maskray

SIZE: 0,7m / RARITY: Rare / BEHAVIOR: Indifferent / AGE: Years

Crevalle jack

The crevalle jack (Caranx hippos), also known as the common jack, black-tailed trevally, couvalli jack, black cavalli, jack crevale, or yellow cavalli is a common species of large marine fish classified within the jack family, Carangidae. The crevalle jack is distributed across the tropical and temperate waters

Giant Travally, Koh Chang, Thailand

Giant Travally

SIZE: 1,7m / RARITY: Rare / BEHAVIOR: Fearful / AGE: 20 Years

Golden Travally, Koh Chang, Thailand

Golden Travally

SIZE: 1,2m / RARITY: Uncommon / BEHAVIOR: Curious / AGE: 20 Years

Batfishes & Coastal Fishes

Coastal fish, also called inshore fish or neritic fish, inhabit the sea between the shoreline and the edge of the continental shelf. Since the continental shelf is usually less than 200 metres deep, it follows that pelagic coastal fish are generally epipelagic fish, inhabiting the sunlit epipelagic zone. Coastal fish can be contrasted with oceanic fish or offshore fish, which inhabit the deep seas beyond the continental shelves.

Longfin Batfish, Koh Chang, Thailand

Longfin Batfish

SIZE: 0,7m / RARITY: Uncommon / BEHAVIOR: Curious

Great Baracuda, Koh Chang, Thailand

Great Baracuda

SIZE: 1,7m / RARITY: Uncommon / BEHAVIOR: Indifferent / DANGEROUSNESS: Bite

Longfin Batfish, Koh Chang, Thailand

Yellow Tail Baracuda

SIZE: 1,4m / RARITY: Uncommon / BEHAVIOR: Curious

Chevron Barracuda, Koh Chang, Thailand

Chevron Barracuda

SIZE: 1,2m / RARITY: Uncommon / BEHAVIOR: Indifferent

Keeltail Needlefish, Koh Chang, Thailand

Keeltail Needlefish

SIZE: 0,6m / RARITY: Common / BEHAVIOR: Fearful

Redbelly Yellowtail Fusilier, Koh Chang, Thailand

Redbelly Yellowtail Fusilier

SIZE: 0,6m / RARITY: Uncommon / BEHAVIOR: Fearful

Coral Reef Fish’s

Coral reef fish are fish which live amongst or in close relation to coral reefs. Coral reefs form complex ecosystems with tremendous biodiversity. Among the myriad inhabitants, the fish stand out as colourful and interesting to watch. Hundreds of species can exist in a small area of a healthy reef, many of them hidden or well camouflaged. Reef fish have developed many ingenious specialisations adapted to survival on the reefs.

Coral Rabbitfish, Koh Chang, Thailand

Coral Rabbitfish

SIZE: 0,4m / RARITY: Uncommon / BEHAVIOR: Indifferent

Clarks Anemonefish, Koh Chang, Thailand

Clarks Anemonefish

SIZE: 0,15m / RARITY: Common / BEHAVIOR: Indifferent AGE: 14 Years

Fire Clownfish, Koh Chang, Thailand

Fire Clownfish

SIZE: 0,15m / RARITY: Common / BEHAVIOR: Indifferent

Skunk Clownfish, Koh Chang, Thailand

Skunk Clownfish

SIZE: 0,15m / RARITY: Common / BEHAVIOR: Indifferent AGE: 14 Years


Damselfishes comprise the family Pomacentridae except those of the genera Amphiprion and Premnas, which are the anemonefishes. The largest can grow up to 36 cm (14 in) long, but most species are much smaller. While most are marine, a few species inhabit the lower stretches of rivers in fresh water. Most damselfish species have bright colors or strongly contrasting patterns.

Scissortail Sergeant, Koh Chang, Thailand

Scissortail Sergeant

SIZE: 0,2m / RARITY: Plentiful / BEHAVIOR: Indifferent

Domino Damselfish, Koh Chang, Thailand

Domino Damselfish

SIZE: 0,14m / RARITY: Uncommon / BEHAVIOR: Aggressive

Sapphire Damsel, Koh Chang, Thailand

Sapphire Damsel

SIZE: 0,11m / RARITY: Uncommon / BEHAVIOR: Indifferent

Black-bar Chromis, Koh Chang, Thailand

Black-bar Chromis

SIZE: 0,06m / RARITY: Uncommon / BEHAVIOR: Fearful

Anthias and Cardinalfishes

Cardinalfishes are a family, Apogonidae, of ray-finned fishes found in the Atlantic, Indian, and Pacific Oceans; they are chiefly marine, but some species are found in brackish water and a few (notably Glossamia) are found in fresh water. A handful of species are kept in the aquarium and are popular as small, peaceful, and colourful fish. The family includes about 370 species.

Stocky Anthias, Koh Chang, Thailand

Stocky Anthias

SIZE: 0,2m / RARITY: Plentiful / BEHAVIOR: Indifferent

Purple Anthis, Koh Chang, Thailand

Purple Anthis

SIZE: 0,12m / RARITY: Common / BEHAVIOR: Indifferent

Yellow-striped cardinalfish, Koh Chang, Thailand

Yellow-striped cardinalfish

SIZE: 0,11m / RARITY: Uncommon / BEHAVIOR: Indifferent

Pajama Cardinalfish, Koh Chang, Thailand

Pajama Cardinalfish

SIZE: 0,08m / RARITY: Rare / BEHAVIOR: Indifferent


The squirrelfish is a silvery red, sea fish with orange-gold body stripes. There are about 150 species of squirrelfish, their most distinguishing characteristics are their large eyes and the long third spine of the anal fin. It lives in coral reefs in tropical and warm temperate seas and eats zoobenthos.

Blackfin Squirrelfish, Koh Chang, Thailand

Blackfin Squirrelfish

SIZE: 0,35m / RARITY: Uncommon / BEHAVIOR: Indifferent

Doubletooth Soldierfish, Koh Chang, Thailand

Doubletooth Soldierfish

SIZE: 0,3m / RARITY: Common / BEHAVIOR: Indifferent

Threespot Squirrelfish, Koh Chang, Thailand

Threespot Squirrelfish

SIZE: 0,27m / RARITY: Common / BEHAVIOR: Indifferent

Crown Squirrelfish, Koh Chang, Thailand

Crown Squirrelfish

SIZE: 0,17m / RARITY: Common / BEHAVIOR: Indifferent


The wrasses are a family, Labridae, of marine fish, many of which are brightly colored. The family is large and diverse, with over 600 species in 81 genera, which are divided into 9 subgroups or tribes. They are typically small fish, most of them less than 20 cm long, although the largest, the humphead wrasse, can measure up to 2.5 m. They are efficient carnivores, feeding on a wide range of small invertebrates.

Triplrtail Wrasse, Koh Chang, Thailand

Triplrtail Wrasse

SIZE: 0,45m / RARITY: Uncommon / BEHAVIOR: Fearful

African Coris, Koh Chang, Thailand

African Coris

SIZE: 0,4m / RARITY: Uncommon / BEHAVIOR: Fearful

Sling-jaw Wrasse, Koh Chang, Thailand

Sling-jaw Wrasse

SIZE: 0,54m / RARITY: Common / BEHAVIOR: Indifferent

Pastel Ringwrasse, Koh Chang, Thailand

Pastel Ringwrasse

SIZE: 0,5m / RARITY: Uncommon / BEHAVIOR: Fearful


Snappers are a family of perciform fish, Lutjanidae, mainly marine, but with some members inhabiting estuaries, feeding in fresh water. The family includes about 113 species. Some are important food fish. One of the best known is the red snapper.

Emperor Red Snapper, Koh Chang, Thailand

Emperor Red Snapper

SIZE: 1,16m / RARITY: Uncommon / BEHAVIOR: Fearful / AGE: 35 Years

Mangrove Red Snapper, Koh Chang, Thailand

Mangrove Red Snapper

SIZE: 1,2m / RARITY: Uncommon / BEHAVIOR: Fearful / AGE: 35 Years

Sailfin Snapper, Koh Chang, Thailand

Sailfin Snapper

SIZE: 0,6m / RARITY: Rare / BEHAVIOR: Indifferent

Bluestripe Snapper, Koh Chang, Thailand

Bluestripe Snapper

SIZE: 0,4m / RARITY: Common / BEHAVIOR: Indifferent


Plectorhinchus chaetodonoides, the harlequin sweetlips, is a species of grunt native to the Indian Ocean and the western Pacific Ocean. It is a denizen of coral reefs found at depths of from 1 to 30 m.

Harlequin Sweetlips, Koh Chang, Thailand

Harlequin Sweetlips

SIZE: 0,7m / RARITY: Uncommon / BEHAVIOR: Indifferent

Oriental Sweetlips, Koh Chang, Thailand

Oriental Sweetlips

SIZE: 0,7m / RARITY: Common / BEHAVIOR: Indifferent

Yellowbanded Sweetlips, Koh Chang, Thailand

Yellowbanded Sweetlips

SIZE: 0,7m / RARITY: Common / BEHAVIOR: Indifferent

Dory Snapper, Koh Chang, Thailand

Dory Snapper

SIZE: 0,35m / RARITY: Common / BEHAVIOR: Indifferent AGE: 23 years


The Lethrinidae are a family of fishes in the order Perciformes commonly known as emperors, emperor breams, and pigface breams. These fish are found in tropical waters of the Pacific and Indian Oceans, and Lethrinus atlanticus is also found in the eastern Atlantic Ocean.

Longface Emporor, Koh Chang, Thailand

Longface Emporor

SIZE: 1,00m / RARITY: Uncommon / BEHAVIOR: Fearful

Sweetlip Emporor, Koh Chang, Thailand

Sweetlip Emporor

SIZE: 0,90m / RARITY: Uncommon / BEHAVIOR: Fearful

Thumbprint Emporor, Koh Chang, Thailand

Thumbprint Emporor

SIZE: 0,50m / RARITY: Uncommon / BEHAVIOR: Fearful AGE: 15 Years

Striped large-eye bream, Koh Chang, Thailand

Striped large-eye bream

SIZE: 0,30m / RARITY: Common / BEHAVIOR: Indifferent

Soapfishes and Dottybacks

The Serranidae (Soapfishes and Dottybacks) are a large family of fishes belonging to the order Perciformes. The family contains about 450 species in 65 genera, including the sea basses and the groupers (subfamily Epinephelinae).

Firetail Dottyback, Koh Chang, Thailand

Firetail Dottyback

SIZE: 0,20m / RARITY: Uncommon / BEHAVIOR: Fearful

Royal Dottyback, Koh Chang, Thailand

Royal Dottyback

SIZE: 0,07m / RARITY: Common / BEHAVIOR: Indifferent


The Serranidae are a large family of fishes belonging to the order Perciformes. The family contains about 450 species in 65 genera, including the sea basses and the groupers (subfamily Epinephelinae). Although many species are small, in some cases less than 10 cm, the giant grouper (Epinephelus lanceolatus) is one of the largest bony fishes in the world, growing to 2.7 m in length and 400 kg in weight. Representatives of this group live in tropical and subtropical seas worldwide.

Brown-marbled Grouper, Koh Chang, Thailand

Brown-marbled Grouper

SIZE: 1,20m / RARITY: Rare / BEHAVIOR: Indifferent

Malabar Grouper, Koh Chang, Thailand

Malabar Grouper

SIZE: 1,20m / RARITY: Uncommon / BEHAVIOR: Fearful / AGE: 32 Years

Highfin Coralgrouper, Koh Chang, Thailand

Highfin Coralgrouper

SIZE: 0,75m / RARITY: Rare / BEHAVIOR: Indifferent

Humpback Grouper, Koh Chang, Thailand

Humpback Grouper

SIZE: 0,70m / RARITY: Rare / BEHAVIOR: Fearful

Peacock hind, Koh Chang, Thailand

Peacock hind

SIZE: 0,75m / RARITY: Rare / BEHAVIOR: Fearful

Tomato hind, Koh Chang, Thailand

Tomato hind

SIZE: 0,58m / RARITY: Uncommon / BEHAVIOR: Indifferent


Marine angelfish are perciform fish of the family Pomacanthidae. They are found on shallow reefs in the tropical Atlantic, Indian, and mostly western Pacific Oceans. The family contains seven genera and about 86 species. They should not be confused with the freshwater angelfish, tropical cichlids of the Amazon Basin.

Bluering Angelfish, Koh Chang, Thailand

Bluering Angelfish

SIZE: 0,45m / RARITY: Rare / BEHAVIOR: Indifferent

Sixbar Angelfish, Koh Chang, Thailand

Sixbar Angelfish

SIZE: 0,45m / RARITY: Uncommon / BEHAVIOR: Fearful

Yellowface Angelfish, Koh Chang, Thailand

Yellowface Angelfish

SIZE: 0,38m / RARITY: Rare / BEHAVIOR: Fearful

Royal Angelfish, Koh Chang, Thailand

Royal Angelfish

SIZE: 0,25m / RARITY: Uncommon / BEHAVIOR: Indifferent / AGE: 15 Years


The butterflyfish are a group of conspicuous tropical marine fish of the family Chaetodontidae; the bannerfish and coralfish are also included in this group. The approximately 129 species in 12 genera[1] are found mostly on the reefs of the Atlantic, Indian, and Pacific Oceans. A number of species pairs occur in the Indian and Pacific Oceans, members of the huge genus Chaetodon.

Pennant Coralfish, Koh Chang, Thailand

Pennant Coralfish

SIZE: 0,25m / RARITY: Common / BEHAVIOR: Indifferent

Lined Butterflyfish, Koh Chang, Thailand

Lined Butterflyfish

SIZE: 0,30m / RARITY: Rare / BEHAVIOR: Fearful / AGE: 10 Years

Chopperband Butterflyfish, Koh Chang, Thailand

Chopperband Butterflyfish

SIZE: 0,38m / RARITY: Rare / BEHAVIOR: Fearful

Redtail Butterflyfish, Koh Chang, Thailand

Redtail Butterflyfish

SIZE: 0,18m / RARITY: Uncommon / BEHAVIOR: Indifferent


Parrotfishes are a group of about 95 fish species regarded as a family (Scaridae), or a subfamily (Scarinae) of the wrasses. With about 95 species, this group’s largest species richness is in the Indo-Pacific. They are found in coral reefs, rocky coasts, and seagrass beds, and can play a significant role in bioerosion.

Steephead Parrotfish, Koh Chang, Thailand

Steephead Parrotfish

SIZE: 0,70m / RARITY: Uncommon / BEHAVIOR: Indifferent

Daisy Parrotfish, Koh Chang, Thailand

Daisy Parrotfish

SIZE: 0,40m / RARITY: Common / BEHAVIOR: Indifferent


Triggerfishes are about 40 species of often brightly colored fish of the family Balistidae. Often marked by lines and spots, they inhabit tropical and subtropical oceans throughout the world, with the greatest species richness in the Indo-Pacific. Most are found in relatively shallow, coastal habitats, especially at coral reefs, but a few, such as the oceanic triggerfish (Canthidermis maculata), are pelagic. While several species from this family are popular in the marine aquarium trade, they are often notoriously ill-tempered.

Titan Triggerfish, Koh Chang, Thailand

Titan Triggerfish

SIZE: 0,85m / RARITY: Common / BEHAVIOR: Agressive

Picasso Triggerfish, Koh Chang, Thailand

Picasso Triggerfish

SIZE: 0,30m / RARITY: Uncommon / BEHAVIOR: Agressive


The filefish (Monacanthidae) are a diverse family of tropical to subtropical tetraodontiform marine fish, which are also known as foolfish, leatherjackets or shingles. They live in the Atlantic, Pacific and Indian Oceans. Filefish are closely related to the triggerfish, pufferfish and trunkfish.

Scrawled Filefish, Koh Chang, Thailand

Scrawled Filefish

SIZE: 1,10m / RARITY: Uncommon / BEHAVIOR: Fearful

Prickly Leatherjacket, Koh Chang, Thailand

Prickly Leatherjacket

SIZE: 0,31m / RARITY: Rare / BEHAVIOR: Indifferent


The Tetraodontidae are a family of primarily marine and estuarine fish of the order Tetraodontiformes. The family includes many familiar species which are variously called pufferfish, puffers, balloonfish, blowfish, blowies, bubblefish, globefish, swellfish, toadfish, toadies, honey toads, sugar toads, and sea squab.

Black-blothed Porcupinefish, Koh Chang, Thailand

Black-blothed Porcupinefish

SIZE: 0,65m / RARITY: Uncommon / BEHAVIOR: Indifferent

Blackspotted Pufferfish, Koh Chang, Thailand

Blackspotted Pufferfish

SIZE: 0,33m / RARITY: Common / BEHAVIOR: Indifferent

Goatfishes and other bottom Fishes

Goatfishes are characterized by a pair of chin barbels (or “goatee”), which contain chemosensory organs and are used to probe the sand or holes in the reef for food. Their bodies are deep and elongated, with forked tails and widely separated dorsal fins.

Dash-and-Dot Goatfish, Koh Chang, Thailand

Dash-and-Dot Goatfish

SIZE: 0,60m / RARITY: Common / BEHAVIOR: Indifferent

Doublebar Goatfish, Koh Chang, Thailand

Doublebar Goatfish

SIZE: 0,35m / RARITY: Common / BEHAVIOR: Indifferent

Striped eel Catfish, Koh Chang, Thailand

Striped eel Catfish

SIZE: 0,32m / RARITY: Uncommon / BEHAVIOR: Indifferent / Dangerousness: Lethal

Mandarinfish, Koh Chang, Thailand


SIZE: 0,07m / RARITY: Common / BEHAVIOR: Indifferent

Lengthened & Strange Fishes

The pipefish is widespread throughout the tropical waters of the Indo-Pacific region, Red Sea included. Its range includes Australia, Fiji, French Polynesia, Indonesia, Japan, the Marshall Islands, New Caledonia, Northern Mariana Islands, Papua New Guinea, the Philippines, Samoa, the Solomon Islands, South Africa, and Taiwan. It inhabits tide pools, lagoons, and outer reef slopes in tropical climates.

Seahorses range in size from 1.5 to 35.5 cm. They are named for their equine appearance, with bent necks and long snouted heads and a distinctive trunk and tail. Although they are bony fish, they do not have scales, but rather thin skin stretched over a series of bony plates, which are arranged in rings throughout their bodies.

Ringed Pipefish, Koh Chang, Thailand

Ringed Pipefish

SIZE: 0,19m / RARITY: Rare / BEHAVIOR: Indifferent AGE: 10 Years

Grooved Razor-fish, Koh Chang, Thailand

Grooved Razor-fish

SIZE: 0,15m / RARITY: Uncommon / BEHAVIOR: Indifferent

Spotted Seahorse, Koh Chang, Thailand

Spotted Seahorse

SIZE: 0,30m / RARITY: Rare / BEHAVIOR: Indifferent

Brown-banded Pipefish, Koh Chang, Thailand

Brown-banded Pipefish

SIZE: 0,10m / RARITY: Rare / BEHAVIOR: Indifferent

Blennies and Gobies

Generally benthic fish, blennies spend much of their time on or near the bottom. They may inhabit the rocky crevices of reefs, burrows in sandy or muddy substrates, or even empty shells. Generally found in shallow waters, some combtooth blennies are capable of leaving the water for short periods during low tide, aided by their large pectoral fins which act as “feet”. Small benthic crustaceans, mollusks, and other sessile invertebrates are the primary food items for most species; others eat algae or plankton.

Maiden Goby, Koh Chang, Thailand

Maiden Goby

SIZE: 0,20m / RARITY: Common / BEHAVIOR: Indifferent

GLeopard blenny, Koh Chang, Thailand

GLeopard blenny

SIZE: 0,15m / RARITY: Uncommon / BEHAVIOR: Fearful

Blackflap Blenny, Koh Chang, Thailand

Blackflap Blenny

SIZE: 0,30m / RARITY: Rare / BEHAVIOR: Indifferent

Linear Blenny, Koh Chang, Thailand

Linear Blenny

SIZE: 0,09m / RARITY: Uncommon / BEHAVIOR: Indifferent


Lizardfishes are generally small, although the largest species measures about 60 cm in length. They have slender, somewhat cylindrical bodies, and heads that superficially resemble those of lizards. The dorsal fin is located in the middle of the back, and accompanied by a small adipose fin placed closer to the tail. They have mouths full of sharp teeth, even on the tongue.

Variegated Lizardfish, Koh Chang, Thailand

Variegated Lizardfish

SIZE: 0,40m / RARITY: Common / BEHAVIOR: Indifferent

Speckled Sandperch, Koh Chang, Thailand

Speckled Sandperch

SIZE: 0,30m / RARITY: Common / BEHAVIOR: Indifferent

Spotted Sand-diver, Koh Chang, Thailand

Spotted Sand-diver

SIZE: 0,22m / RARITY: Uncommon / BEHAVIOR: Fearful

Fire goby, Koh Chang, Thailand

Fire goby

SIZE: 0,09m / RARITY: Common / BEHAVIOR: Fearful


The Scorpionfishes (Scorpaeniformes) are a diverse order of ray-finned fish, including the lionfish, but have also been called the Scleroparei. It is one of the five largest orders of bony fishes by number of species, with over 1,320. They are known as “mail-cheeked” fishes due to their distinguishing characteristic, the suborbital stay: a backwards extension of the third circumorbital bone (part of the lateral head/cheek skeleton, below the eye socket) across the cheek to the preoperculum, to which it is connected in most species

Scorpaena Scrofa (Dragon-head), Koh Chang, Thailand

Scorpaena Scrofa (Dragon-head)

SIZE: 0,30m / RARITY: Common / BEHAVIOR: Indifferent / Dangerousness: Spines/Lethal

Broadbarred Firefish, Koh Chang, Thailand

Broadbarred Firefish

SIZE: 0,20m / RARITY: Uncommon / BEHAVIOR: Indifferent / Dangerousness: Spines/Lethal

Red Lionfish, Koh Chang, Thailand

Red Lionfish

SIZE: 0,40m / RARITY: Common / BEHAVIOR: Indifferent / Dangerousness: Spines/Lethal


Reptiles are tetrapod animals in the class Reptilia, comprising today’s turtles, crocodilians, snakes, amphisbaenians, lizards, tuatara, and their extinct relatives. The study of these traditional reptile orders, historically combined with that of modern amphibians, is called herpetology.

Leatherback Turtle, Koh Chang, Thailand

Leatherback Turtle

SIZE: 2,00m / RARITY: Rare / BEHAVIOR: Indifferent

Green Turtles, Koh Chang, Thailand

Green Turtles

SIZE: 1,20m / RARITY: Uncommon / BEHAVIOR: Indifferent

Hawksbill Turtle, Koh Chang, Thailand

Hawksbill Turtle

SIZE: 1,00m / RARITY: Uncommon / BEHAVIOR: Fearful

Blue-lipped Sea Krait

Blue-lipped Sea Krait

SIZE: 1,10m / RARITY: Rare / BEHAVIOR: Indifferent / Dangerousness: Lethal


Shrimps play important roles in the food chain and are an important food source for larger animals ranging from fish to whales. The muscular tails of many shrimp are edible to humans, and they are widely caught and farmed for human consumption. Commercial shrimp species support an industry worth 50 billion dollars a year, and in 2010 the total commercial production of shrimp was nearly 7 million tonnes.

Harlequin Shrimp, Koh Chang, Thailand

Harlequin Shrimp

SIZE: 0,05m / RARITY: Rare / BEHAVIOR: Fearful

Dancing shrimp, Koh Chang, Thailand

Dancing shrimp

SIZE: 0,05m / RARITY: Uncommon / BEHAVIOR: Indifferent

Pine-cone-marbled shrimp, Thailand

Pine-cone-marbled shrimp

SIZE: 0,04m / RARITY: Rare / BEHAVIOR: Indifferent

Peacock-tail anemone shrimp

Peacock-tail anemone shrimp

SIZE: 0,04m / RARITY: Common / BEHAVIOR: Indifferent


Crabs are generally covered with a thick exoskeleton, composed primarily of highly mineralized chitin, and armed with a single pair of chelae (claws). Crabs are found in all of the world’s oceans, while many crabs live in fresh water and on land, particularly in tropical regions. Crabs vary in size from the pea crab, a few millimeters wide, to the Japanese spider crab, with a leg span up to 4 m.

Spotted-Reef Crab, Koh Chang, Thailand

Spotted-Reef Crab

SIZE: 0,17m / RARITY: Uncommon / BEHAVIOR: Indifferent

Splendid-Pebble Crab, Koh Chang, Thailand

Splendid-Pebble Crab

SIZE: 0,15m / RARITY: Uncommon / BEHAVIOR: Indifferent

Spanner Crab, Thailand

Spanner Crab

SIZE: 0,15m / RARITY: Common / BEHAVIOR: Fearful

Hairy-Yellow Hermit Crab

Hairy-Yellow Hermit Crab

SIZE: 0,12m / RARITY: Common / BEHAVIOR: Fearful


Bivalvia, in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of marine and freshwater molluscs that have laterally compressed bodies enclosed by a shell consisting of two hinged parts. Bivalves as a group have no head and they lack some usual molluscan organs like the radula and the odontophore. They include the clams, oysters, cockles, mussels, scallops, and numerous other families that live in saltwater, as well as a number of families that live in freshwater.

Giant Clam, Koh Chang, Thailand

Giant Clam

RARITY: Rare / Assosiation: Symbiosis / AGE: 100 years

Black-lip-Pearl Oyster, Thailand

Black-lip-Pearl Oyster

RARITY: Common

Coral Scallop, Thailand

Coral Scallop

RARITY: Common

Oriental-Fire Clam

Oriental-Fire Clam



The gastropods, commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda. This class comprises snails and slugs from saltwater, from freshwater, and from the land. There are many thousands of species of sea snails and slugs, as well as freshwater snails, freshwater limpets, and land snails and slugs.

Giant Clam, Koh Chang, Thailand

Giant Clam

SIZE: 0,40M / RARITY: Uncommon

Rose-branch-Murex, Thailand


SIZE: 0,13M / RARITY: Common

Textile-Crone Shell, Thailand

Textile-Crone Shell

SIZE: 0,15M / RARITY: Rare / DANGEROUSNESS: Spine/Lethal


Map Crowie

SIZE: 0,10M / RARITY: Rare


Nudibranchs are a group of soft-bodied, marine gastropod molluscs which shed their shells after their larval stage. They are noted for their often extraordinary colours and striking forms, and they have been given colourful nicknames to match, such as “clown,” “marigold,” “splendid,” “dancer,” “dragon,” or “sea rabbit.” Currently, about 3,000 valid species of nudibranchs are known.

Red-lined-Jorunna, Koh Chang, Thailand

Red-lined Jorunna

SIZE: 0,30M / RARITY: Rare

Black-and-Green-Sea-Slug, Thailand

Black and Green Sea-Slug

SIZE: 0,12M / RARITY: Unommon

Varicose Wart-Slug, Thailand

Varicose Wart-Slug

SIZE: 0,11M / RARITY: Rare

Annas Chromodoris

Annas Chromodoris

SIZE: 0,05M / RARITY: Uncommon


Most sea cucumbers, as their name suggests, have a soft and cylindrical body, more or less lengthened, rounded off and occasionally fat in the extremities, and generally without solid appendages. Their shape ranges from almost spherical for “sea apples” (genus Pseudocolochirus) to serpent-like for Apodida or the classic sausage-shape, while others resemble caterpillars.

Mimic Octopus, Koh Chang, Thailand

Mimic Octopus

SIZE: 0,60M / RARITY: Rare

Broadclub Cuttlefish, Thailand

Broadclub Cuttlefish

SIZE: 0,50M / RARITY: Unommon

Bigfin-Reef-Squidg, Thailand

Bigfin-Reef Squid

SIZE: 0,45M / RARITY: Common

Sea Cucambers

A cephalopod is any member of the molluscan class Cephalopoda (Greek plural κεφαλόποδες, kephalópodes; “head-feet”) such as a squid, octopus, or nautilus. These exclusively marine animals are characterized by bilateral body symmetry, a prominent head, and a set of arms or tentacles (muscular hydrostats) modified from the primitive molluscan foot. Fishermen sometimes call cephalopods “inkfish,” referring to their common ability to squirt ink.

Curryfish Sea-Cucumber, Koh Chang, Thailand

Curryfish Sea-Cucumber

SIZE: 0,60M / RARITY: Uncommon

Black-Spotted Sea-Cucumber, Thailand

Black-Spotted Sea-Cucumber

SIZE: 0,70M / RARITY: Unommon


Sea urchins, are typically spiny, globular animals, echinoderms in the class Echinoidea. About 950 species live on the seabed, inhabiting all oceans and depth zones from the intertidal to 5,000 metres. Their tests (hard shells) are round and spiny, typically from 3 to 10 cm across. Sea urchins move slowly, crawling with their tube feet, and sometimes pushing themselves with their spines. They feed primarily on algae but also eat slow-moving or sessile animals.

Diadem Urchin, Koh Chang, Thailand

Diadem Urchin

SIZE: 0,60m / RARITY: Common / DANGEROUSNESS: Spine

Flower-Urchin, Koh Chang, Thailand

Flower Urchin

SIZE: 0,15m / RARITY: Common / DANGEROUSNESS: Spine/Lethal

Sea Stars

Starfish or sea stars are star-shaped echinoderms belonging to the class Asteroidea. Common usage frequently finds these names being also applied to ophiuroids, which are correctly referred to as brittle stars or basket stars. Starfish are also known as Asteroids due to being in the class Asteroidea. About 1,500 species of starfish occur on the seabed in all the world’s oceans, from the tropics to frigid polar waters.

Crown-of-Thornes Starfish, Koh Chang, Thailand

Crown-of-Thornes Starfish

SIZE: 0,50m / RARITY: Uncommon / Dangerousness: Spine


Cushion Starfish

SIZE: 0,30m / RARITY: Uncommon


Pseudoceros ferrugineus can reach a length of about 18–48 mm. It has an enlarged oval shape. The upper surface of the body is fuchsia (hence the common name) with small white dots and two marginal bands red and orange without dots

Hymans-flatworm, Koh Chang, Thailand

Hymans flatworm

SIZE: 0,07m / RARITY: Uncommon


Brilliant flatworm

SIZE: 0,06m / RARITY: Uncommon

Lindas flatworm, Koh Chang, Thailand

Lindas flatworm

SIZE: 0,06m / RARITY: Uncommon

Fuchsa flatworm

Fuchsa flatworm

SIZE: 0,06m / RARITY: Uncommon

Flowers-flatworm, Koh Chang, Thailand

Flowers flatworm

SIZE: 0,04m / RARITY: Uncommon


Sabellidae, or feather duster worms, are a family of marine polychaete tube worms characterized by protruding feathery branchiae. Sabellids build tubes out of a tough, parchment-like exudate, strengthened with sand and bits of shell. Unlike the other sabellids, the genus Glomerula secretes a tube of calcium carbonate instead. Sabellidae can be found in subtidal habitats around the world. Their oldest fossils are known from the Early Jurassic.

Feather-Duster-Worm, Koh Chang, Thailand

Feather-Duster Worm

SIZE: 0,04m / RARITY: Common


Red Fanworm

SIZE: 0,06m / RARITY: Common

Christmas-tree Worms, Koh Chang, Thailand

Christmas-tree Worms

SIZE: 0,04m / RARITY: Common

Branching Corals

Stony corals are members of the class Anthozoa and like other members of the group, do not have a medusa stage in their life cycle. The individual animals are known as polyps and have a cylindrical body crowned by an oral disc surrounded by a ring of tentacles. The base of the polyp secretes the stony material from which the coral skeleton is formed.

Great Staghorn Coral, Koh Chang, Thailand

Great Staghorn Coral

SIZE: 7,00m / RARITY: Common

Staghorn Coral

Staghorn Coral

SIZE: 1,50m / RARITY: Common / VULNERABILITY: Threatened

Robust Table-coral, Koh Chang, Thailand

Robust Table-coral

SIZE: 1,20m / RARITY: Common

Wide Star Acropora

Wide Star Acropora

SIZE: 0,80m / RARITY: Common

Finger Acropora, Koh Chang, Thailand

Finger Acropora

SIZE: 0,60m / RARITY: Common

Sandpaper Coral, Koh Chang, Thailand

Sandpaper Coral

SIZE: 2,50m / RARITY: Common

Antler Coral, Koh Chang, Thailand

Antler Coral

SIZE: 1,00m / RARITY: Common / VULNERABILITY: Threatened

Juweled Finger Coral, Koh Chang, Thailand

Juweled Finger Coral

SIZE: 1,00m / RARITY: Common / VULNERABILITY: Threatened

Finger Cora, Koh Chang, Thailand

Finger Coral

SIZE: 0,50m / RARITY: Common

Finger Coral, Koh Chang, Thailand

Finger Coral

SIZE: 0,30m / RARITY: Common

Massive- & Brain Corals

Knob Coral, Koh Chang, Thailand

Knob Coral

SIZE: 1,00m / RARITY: Common

Honeycomb Coral, Koh Chang, Thailand

Honeycomb Coral

SIZE: 1,50m / RARITY: Common / VULNERABILITY: Threatened

Head Coral, Koh Chang, Thailand

Head Coral

SIZE: 1,00m / RARITY: Common

Flexus Moon Coral, Koh Chang, Thailand

Flexus Moon Coral

SIZE: 1,20m / RARITY: Common / VULNERABILITY: Threatened

Columna Gonioppra, Koh Chang, Thailand

Columna Gonioppra

SIZE: 0,60m / RARITY: Common / VULNERABILITY: Threatened

Lobed Brain Coral, Koh Chang, Thailand

Lobed Brain Coral

SIZE: 5,00m / RARITY: Common

Bubble Coral, Koh Chang, Thailand

Bubble Coral

SIZE: 2,00m / RARITY: Uncommon / VULNERABILITY: Threatened

Net Brain Coral, Koh Chang, Thailand

Net Brain Coral

SIZE: 1,00m / RARITY: Common

Australian Brain Coral, Koh Chang, Thailand

Australian Brain Coral

SIZE: 2,00m / RARITY: Common

Closed Brain Coral, Koh Chang, Thailand

Closed Brain Coral

SIZE: 1,50m / RARITY: Common / VULNERABILITY: Threatened

Leaf-, Mushroom & Hydros-, Flower Corals

Rough pachyseris, Koh Chang, Thailand

Rough pachyseris

SIZE: 8,00m / RARITY: Common

Leafy Cub Coral, Koh Chang, Thailand

Leafy Cub Coral

SIZE: 3,00m / RARITY: Plenty / VULNERABILITY: Threatened

Head Coral, Koh Chang, Thailand

Elepant-skin Coral

SIZE: 2,00m / RARITY: Common

Mushroom Coral, Koh Chang, Thailand

Mushroom Coral

SIZE: 0,30m / RARITY: Common

Open brain Coral, Koh Chang, Thailand

Open brain Coral

SIZE: 0,20m / RARITY: Uncommon / VULNERABILITY: Threatened

Fire Coral, Koh Chang, Thailand

Fire Coral

SIZE: 1,00m / RARITY: Common

Anchor Coral, Koh Chang, Thailand

Anchor Coral

SIZE: 1,00m / RARITY: Uncommon / VULNERABILITY: Threatened

Orange Cup Coral, Koh Chang, Thailand

Orange Cup Coral

SIZE: 0,35m / RARITY: Uncommon

Yellow Commensal Anemon, Koh Chang, Thailand

Yellow Commensal Anemon

SIZE: 0,30m / RARITY: Uncommon

Mushroom Anemone, Koh Chang, Thailand

Mushroom Anemone

SIZE: m / RARITY: Common

Sea Fans & Anemones

Lyre Sea Fan, Koh Chang, Thailand

Lyre Sea Fan

SIZE: 1,50m / RARITY: Unommon

Giant Sea Fan, Koh Chang, Thailand

Giant Sea Fan

SIZE: 2,00m / RARITY: Uncommon

Knotted Fan Coral, Koh Chang, Thailand

Knotted Fan Coral

SIZE: 1,00m / RARITY: Uncommon

Black Coral, Koh Chang, Thailand

Black Coral

SIZE: 3,00m / RARITY: Rare

Spiral Wire Coral, Koh Chang, Thailand

Spiral Wire Coral

SIZE: 2,00m / RARITY: Common

Magnificient Sea Anemone, Koh Chang, Thailand

Magnificient Sea Anemone

SIZE: 1,00m / RARITY: Common

Giant Carpet Anemone, Koh Chang, Thailand

Giant Carpet Anemone

SIZE: 1,20m / RARITY: Common

Bulb-tentacle sea anemone, Koh Chang, Thailand

Bulb-tentacle sea anemone

SIZE: 0,40m / RARITY: Common

Pizza Sea Anemone, Koh Chang, Thailand

Pizza Sea Anemone

SIZE: 0,35m / RARITY: Uncommon

Stout Hells-fire Anemone, Koh Chang, Thailand

Stout Hells-fire Anemone

SIZE: 0,50m / RARITY: Rare

Soft Corals & Jellyfish

Organ Pipe Coral, Koh Chang, Thailand

Organ Pipe Coral

SIZE: 1,00m / RARITY: Uncommon

Leather Coral, Koh Chang, Thailand

Leather Coral

SIZE: 0,80m / RARITY: Plenty

Carnation Tree Coral, Koh Chang, Thailand

Carnation Tree Coral

SIZE: 0,70m / RARITY: Plenty

Flexible Leather Coral, Koh Chang, Thailand

Flexible Leather Coral

SIZE: 0,50m / RARITY: Plenty

Pulsing Coral, Koh Chang, Thailand

Pulsing Coral

SIZE: 0,20m / RARITY: Uncommon

Spotted Jelly, Koh Chang, Thailand

Spotted Jelly

SIZE: 3,00m / RARITY: Rare / DANGEROUSNESS: Urticant

Australian Spotted Jellyfish, Koh Chang, Thailand

Australian Spotted Jellyfish

SIZE: 0,70m / RARITY: Uncommon / DANGEROUSNESS: Urticant

Portoguese Man-of-War, Koh Chang, Thailand

Portoguese Man-of-War

SIZE: 0,20m / RARITY: Rare / DANGEROUSNESS: Urticant/Lethal

Upside-down Jellyfish, Koh Chang, Thailand

Upside-down Jellyfish

SIZE: 0,30m / RARITY: Uncommon / DANGEROUSNESS: Urticant

Australian Box-jellyfish, Koh Chang, Thailand

Australian Box-jellyfish

SIZE: 4,00m / RARITY: Rare / DANGEROUSNESS: Urticant/Lethal

Tube-, Vase-, Branching- & Massive Sponges

Liliac Tube-sponge, Koh Chang, Thailand

Liliac Tube-sponge

SIZE: 0,80m / RARITY: Unommon

Barrel Sponge, Koh Chang, Thailand

Barrel Sponge

SIZE: 2,00m / RARITY: Plenty

Large Tube-sponge, Koh Chang, Thailand

Large Tube-sponge

SIZE: 0,80m / RARITY: Uncommon

Prickly Tube-sponge, Koh Chang, Thailand

SIZE: 0,50m / RARITY: Uncommon

Elephant ear sponge, Koh Chang, Thailand

Elephant ear sponge

SIZE: 2,00m / RARITY: Common

Pink Puff Ball Sponge, Koh Chang, Thailand

Pink Puff Ball Sponge

SIZE: 0,10m / RARITY: Rare

Red Finger Sponge, Koh Chang, Thailand

Red Finger Sponge

SIZE: 0,70m / RARITY: Common

Vagabound Boring Sponge, Koh Chang, Thailand

Vagabound Boring Sponge

SIZE: 1,00m / RARITY: Common

Red Boring Sponge, Koh Chang, Thailand

Red Boring Sponge

SIZE: 1,00m / RARITY: Uncommon

Yellow Pot Sponge, Koh Chang, Thailand

Yellow Pot Sponge

SIZE: 0,30m / RARITY: Common

Knowledge Quest PDF

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