Fish Species Guide
Gill-breathing aquatic creatures with fins, water-dynamic scales, and streamlined swimming bodies.
Did You Know?
"No two tigers have the exact same stripe pattern — their stripes are as unique as human fingerprints!"
Fish Encyclopedia & Field Guide
Fish constitute the most diverse group of vertebrates on Earth, encompassing over 34,000 documented species. Divided primarily into cartilaginous fish (sharks, rays, chimaeras) and bony ray-finned fish, they possess hydrodynamically streamlined bodies, gill filaments for dissolved oxygen extraction, and sensitive lateral line organs for detecting pressure waves.
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What Fish Is This?
Featured species. Click a card to open the species guide.
Orange Clownfish
Amphiprion percula
🦈Great White Shark
Carcharodon carcharias
🐟Giant Oceanic Manta Ray
Mobula birostris
🐠Palette Surgeonfish (Blue Tang)
Paracanthurus hepatus
🐟Largemouth Bass
Micropterus nigricans
🐟Rainbow Trout
Oncorhynchus mykiss
🐟Channel Catfish
Ictalurus punctatus
🐟Northern Pike
Esox lucius
🐟Yellow Perch
Perca flavescens
Fish Species to Explore
Directory labels for future encyclopedia pages. Use the upload tool or featured cards above for live identification.
Freshwater fish
- •Bass
- •Trout
- •Salmon
- •Catfish
- •Carp
- •Pike
- •Perch
- •Cichlids
Aquarium fish
- •Betta
- •Guppy
- •Goldfish
- •Koi
- •Angelfish
- •Discus
- •Tetra
- •Gourami
Marine fish
- •Clownfish
- •Blue Tang
- •Lionfish
- •Pufferfish
- •Seahorse
- •Mackerel
- •Tuna
Unusual fish
- •Oarfish
- •Anglerfish
- •Blobfish
- •Flying Fish
- •Archerfish
- •Mudskipper
Commonly Confused Fish Pairs
Fish Species Guide
Showing 21 species
Orange Clownfish
Amphiprion percula
A popular vibrant orange tropical reef fish marked by three vertical white stripes outlined in black, famous for its symbiotic relationship with stinging sea anemones.
Great White Shark
Carcharodon carcharias
The world’s largest predatory fish, equipped with serrated triangular teeth, a torpedo-shaped body, and keen electromagnetic sense.
Giant Oceanic Manta Ray
Mobula birostris
The world's largest ray species with wingspans up to 7 meters, possessing the largest brain of any cold-blooded fish, filter-feeding on clouds of zooplankton.
Palette Surgeonfish (Blue Tang)
Paracanthurus hepatus
A vibrant coral reef fish famous for its royal-blue disc body, bright yellow triangle tail, black artist's palette marking, and sharp defensive tail scalpel.
Largemouth Bass
Micropterus nigricans
A deep-bodied freshwater predator with a large mouth that extends past the eye, olive-green sides, and a dark lateral stripe.
Rainbow Trout
Oncorhynchus mykiss
A streamlined freshwater salmonid with black spots on the back and a pink-to-red lateral band along the sides.
Channel Catfish
Ictalurus punctatus
A whiskered freshwater catfish with a deeply forked tail, smooth skin, and scattered dark spots on younger fish.
Northern Pike
Esox lucius
A long, torpedo-shaped freshwater predator with duckbill jaws, light oval spots on a green body, and a rear-set dorsal fin.
Yellow Perch
Perca flavescens
A yellowish freshwater panfish with bold vertical dark bars, two dorsal fins, and orange-tinted lower fins.
Common Carp
Cyprinus carpio
A hardy freshwater carp with large scales, barbels near the mouth, and a deep bronze-to-olive body.
Betta
Betta splendens
A popular aquarium fish known for vivid colors and long flowing fins, especially in male show forms.
Guppy
Poecilia reticulata
A tiny colorful livebearing aquarium fish; males often show elaborate tail patterns while females are plainer.
Goldfish
Carassius auratus
A classic ornamental freshwater fish with rounded body forms ranging from common comet shapes to fancy double-tail varieties.
Koi
Cyprinus carpio
An ornamental carp bred for bold color patches, often kept in outdoor ponds rather than small aquariums.
Freshwater Angelfish
Pterophyllum scalare
A tall, laterally compressed South American cichlid with triangular fins, popular in tropical freshwater aquariums.
Neon Tetra
Paracheirodon innesi
A small Amazon schooling fish with a glowing blue-green lateral stripe and a bright red lower rear body.
Discus
Symphysodon aequifasciatus
A round, laterally compressed Amazon cichlid prized in aquariums for bold vertical bars and vivid cultivated color forms.
Red Lionfish
Pterois volitans
A striking reef fish with zebra-like bands and elaborate venomous spines; invasive in parts of the Atlantic.
Lined Seahorse
Hippocampus erectus
An upright saltwater fish with a horse-like head, prehensile tail, and armored bony rings instead of typical scales.
White-Spotted Puffer
Arothron meleagris
A rounded reef puffer often covered in white spots; can inflate its body when threatened.
Reef Stonefish
Synanceia verrucosa
A master of rock-and-coral camouflage whose dorsal spines can deliver extremely potent venom — widely cited as the most venomous fish.
