1. Blue dot grouper
   Clownfish
2. Marine beta
   Royal gramma

The clownfish, popularized by the movie "Finding Nemo," is usually orange or yellow with white bands around its body. Also called anemonefish, they live in reefs in the Pacific and Indian Oceans.

1. Royal gramma
   Dusky batfish
2. Spinyhead blenny
   Hawaiian blue puffer

The royal gramma is a small fish usually around 3 inches long and found in the Atlantic Ocean. The coolest thing about it is its radical color change, from purple at the head to gold at the tail.

1. Blue tang
   Helmet cowfish
2. Spotfin porcupinefish
   Redlip blenny

Also called a horseface blenny, the redlip blenny is very territorial and will bite enemies with its canine teeth. Redlip blennies, as the name suggest, have red lips and a brown body.

1. Regal blue tang
   Whitebelly puffer
2. Yellow boxfish
   Copperband butterflyfish

Its scientific name is Paracanthurus hepatus, but people commonly call it a blue tang, palette surgeonfish or hippo tang. The fish is flat, with a blue and black body and yellow tail.

1. Fragile cardinalfish
   Raccoon butterflyfish
2. Flamefish
   Barrier reef chromis

You can identify these oval-shaped fish by their raccoon markings around the eyes. Raccoon butterflyfish are nocturnal, reach about 8 inches in length and live in tiny groups.

1. Pajama cardinalfish
   Saddleback butterflyfish
2. Stars and stripes puffer
   Engineer goby

This fish is also called the polkadot cardinalfish, which gives you a hint about its most distinctive trait. Pajama cardinalfish appear in a wide variety of colors but typically have orange eyes.

1. True Percula
   Sunshine chromis
2. Four stripe damsel
   Tinker's butterflyfish

So named because of the four black stripes on its white body, the four stripe damsel is omnivorous and lives in the Pacific Ocean. Like most damsels, it is also aggressive in defending its territory.

1. Four-eyed butterflyfish
   Frostfin cardinalfish
2. Scissortail dartfish
   Spotted mandarin

The four-eyed butterflyfish gets its name because of the eyelike dots ringed with white appearing near the tail. This characteristic makes it easier for the fish to flee predators!

1. Zebra barred dartfish
   Fire fish
2. Mandarinfish
   Yellowtail damsel

The mandarinfish hails from the Pacific Ocean and is known for its vibrant colors. The fish has red eyes with black pupils, giving it a watchful appearance. Mandarinfish thrive in coral reefs.

1. Tuxedo damsel
   Tomato clownfish
2. Paletail chromis
   Elegant firefish

A type of dartfish, the elegant firefish thrives in tropical waters and dines on zooplankton. Also called a purple firefish, it has a light-colored body and a long tail with colorful stripes.

1. Striped blenny
   Orbiculate batfish
2. Starry toadfish
   Blue assessor

This light-colored fish has prickly skin and is covered all over with small black dots. Reaching a length of 47 inches, it protects itself from predators by inflating itself and with its toxicity.

1. Boops boops
   Annular seabream
2. Black musselcracker
   Red porgy

Yes, that's right — the red porgy is a protogynous hermaphrodite, which means all the fish start out as female and some later become male. Red porgies hang around the seabed to find food.

1. Brazilian gramma
   Lyretail grouper
2. Queen angelfish
   Stocky anthias

You can find queen angelfish around the Florida Keys and the Bahamas. They are possibly monogamous because they're commonly seen in pairs. The fish can live up to 15 years.

1. Humpback anglerfish
   Orangehead anthias
2. Pinnate spadefish
   Orange-lined triggerfish

The humpback anglerfish lives up to 4,000 meters below the sea, where the only light comes from bioluminescent organisms. Females of this species are vastly bigger than the males.

1. Common dentex
   Obtuse barracuda
2. Pacific hagfish
   Gilt-head bream

Hagfish are known for being slimy and jawless. Resembling eels, they can reach lengths of 25 inches. Their secret weapon lies in their ability to produce slime, which tastes quite icky.

1. Largehead hairtail
   Sand steenbras
2. Sargo
   Orangeback angelfish

Did the orange stripe from the head across the back give it away? This blue, omnivorous fish, also called the African pygmy angelfish, is typically no longer than 8 centimeters.

1. Cortez rainbow wrasse
   Scup
2. Sheepshead porgy
   Yellow tang

Appearing in the Pacific Ocean, the Cortez rainbow wrasse has blue, yellow and purple bands down its body. Reaching only 6 inches in length, the fish mostly eats fish eggs and plankton.

1. Sargassum trigger
   Blue-headed tilefish
2. Unicorn tang
   Christmas wrasse

This fish is common in the Indian and Pacific Oceans and reaches typically no more than 12 inches in length. Its most distinctive characteristic is its radiant colors, similar to Christmas tree lights!

1. Doctorfish
   Yellowback fusilier
2. Red Sea sailfin tang
   Emperor snapper

The colors on the Red Sea sailfin tang may vary from fish to fish, but it tends to have stripes on the body and fins and small spots on its face and tail. These tropical fish grow up to 16 inches.

1. Red emperor snapper
   Tasselled wobbegong
2. Bigeye soldierfish
   Scarlet squirrelfish

This large fish makes its home in the Pacific and Indian Oceans and has thick white and red bands along its body. The red emperor snapper feels most comfortable in coral reefs, where it can hide.

1. Lined seahorse
   Weedy scorpionfish
2. Stone fish
   Bigeye soldierfish

This orange and red fish has white stripes and big, black eyes. They enjoy eating worms and crustaceans and have an unusual habit of swimming upside down. They're common in the Atlantic.

1. Rogue scorpion
   Sea goblin
2. Bat ray
   Magnificent foxface

Also called a devil stinger, the venomous sea goblin is covered in sharp spines to keep predators at bay. This nocturnal fish buries itself in the sand and waits patiently to attack prey.

1. Red dottyback
   Dragonface pipefish
2. Foxface rabbitfish
   Bicolor parrotfish

Thanks to the foxface rabbitfish's venomous spines, other fish tend to leave it alone! The omnivorous fish normally has bright colors, but it can dull them to help it blend in.

1. Princess parrotfish
   Zebra lionfish
2. Yellowhead jawfish
   Golden trevally

Oddly, the zebra lionfish also goes by the name zebra turkeyfish — perhaps because of the way the fish spreads out its pectoral fins. Most fish leave it alone due to its venom, but grouper will eat it.

1. Pilot fish
   Moorish idol
2. Threadfin lookdown
   Golden trevally

The golden trevally (shown here with a dugong feeding on seagrass beds) thrives in the tropical waters of the Pacific and Indian Oceans. The striped fish with rubbery lips starts out a bold yellow but develops a silvery color as it gets older.

1. Moorish idol
   Indian threadfin
2. Twin spot hogfish
   Redspotted hawkfish

Like the character in the Pixar film, Moorish idols do not respond well to captivity, in part because they're hearty eaters. They are known for their yellow, white and black bands and long dorsal fin.

1. Coral hogfish
   Butter hamlet
2. Longnose hawkfish
   Spotted sweetlips

Reaching about 5 inches in length, the longnose hawkfish resides in tropical reefs and has a long, pointy snout. Its horizontal and vertical red stripes on a white body give it a distinct look.

1. Dogfish prientalis
   Porkfish
2. Crescent banded grunt
   Shy hamlet

The shy hamlet's head and fins are yellow, but the rest of its body is either blue or black. It can indeed be timid around other fish, especially in aquariums, but it adjusts due to its hardiness.

1. Banded pipefish
   Bicolor parrotfish
2. Bicolor pseudochromis
   Yellow blotch rabbitfish

This fish has a long, thin body with trails extending from its head that helps it blend in with reeds. The banded pipefish is common in the Indo-Pacific region and can reach lengths over 7 inches.

1. Shovelnose guitarfish
   Fiddler ray
2. Chilean round ray
   Decoy scorpionfish

Also called a banjo ray, the fiddler ray makes its home on the sandy floor off the coast of Australia. The ray has an oval shape and gray bands appearing in irregular patterns over its brown body.

1. Glass eye squirrelfish
   Striped squirrelfish
2. Blackbar soldierfish
   Pot-bellied seahorse

The pot-bellied seahorse, or big-belly seahorse, has a protruding stomach and grows up to 14 inches, making it one of the largest seahorses. This species is found around Australia and New Zealand.

1. Hawaiian squirrelfish
   Horn shark
2. Yellowback fusilier
   Achilles tang

A furtive fish found in Hawaii, the Hawaiian squirrelfish likes to hide in caves and reefs and peek out cautiously before emerging — much like their namesake. The fish is red with thin white stripes.

1. Purple tilefish
   Assasi trigger
2. Bird wrasse
   Clown tang

Also called a clown surgeonfish, the clown tang has blue horizontal stripes on a yellow body. The male fish is very territorial, keeping outsiders away from its feeding ground and its females.

1. Starry trigger
   Banana wrasse
2. Tomini tang
   Bonnethead shark

The females of this species are yellow as adults, but the males are bluish. Banana wrasses, or sunset wrasses, tend to be active and aggressive and are common in the Pacific and Indian Oceans.

1. Papuan scorpionfish
   Leopard torpedo ray
2. Thorny seahorse
   Princess parrotfish

The thorny seahorse, or spiny seahorse, as its name suggests, is covered with sharp spines. The seahorse has a particularly long, thin snout and it eats mostly plankton and crustaceans.

1. Bicolor parrotfish
   Dragonface pipefish
2. Volitan lionfish
   Yellowhead jawfish

Watch this long pipefish slither across the ocean floor, and you might mistake it for a snake! The dragonface pipefish has varying patterns down its body and a small, tube-like mouth.

1. Threadfin lookdown
   Red diana hogfish
2. Moustache jawfish
   Lyretail hawkfish

The moustache jawfish gets its name for the brown markings on its face that give the impression of facial hair. Like other jawfish, the fish creates elaborate burrows under the rocks and sand.

1. Indigo hamlet
   Flame hawkfish
2. Porkfish
   Yellow watchman goby

The flame hawkfish even looks like a superhero fish with its vibrant red body and black dorsal fin. However, the fish tends to hide out in coral when bigger fish swim by, so don't expect any heroics.

1. Neon goby
   Goldsaddle goatfish
2. Striated frogfish
   Banded sole

Found in the Atlantic Ocean, the neon goby has a distinctive pattern of light and dark blue stripes. The tiny fish does bigger fish a favor by picking off (and eating) parasites on their scales.

1. Flowery flounder
   Mimic filefish
2. Zebra moray
   Warty frogfish

For what some might consider an ugly fish, the warty frogfish is an expert at camouflage. It can even change colors to blend in better! And its mouth stretches wide enough to swallow large prey.