Fish
Fish are the most diverse group of vertebrates, with tens of thousands of species living in fresh water and the sea. These profiles cover popular aquarium and freshwater fish alongside ocean fish, with a consistent reminder that aquarium fish are living animals with real needs — not effortless decorations — and that wild fish are wildlife, not pets.
Freshwater & Aquarium Fish
Popular aquarium and pond fish. Each profile distinguishes responsible aquarium keeping from wild fish and links to the relevant care basics.
Betta Fish
Betta splendens — the labyrinth-breathing Siamese fighting fish.
Goldfish
Carassius auratus — a long-lived domesticated carp-family fish.
Guppy
Poecilia reticulata — a small, colourful livebearer.
Angelfish
Pterophyllum scalare — a tall-finned South American cichlid.
Tetra
Small schooling characins, using the neon tetra as a reference.
Koi
Ornamental varieties of the common carp, kept in ponds.
Carp
Cyprinus carpio — a widespread, often introduced freshwater fish.
Catfish
Order Siluriformes — barbel-bearing fish, using the channel catfish.
Marine & Ocean Fish
Ocean fish covered as wildlife, with cautious conservation notes and clear distinction from aquarium pets. Several of these are group-level overviews.
Clownfish
Anemonefish (Amphiprion) famous for their anemone partnership.
Salmon
Migratory fish that return to fresh water to spawn.
Tuna
Fast, powerful open-ocean fish of the mackerel family.
Seahorse
Upright reef fish where the male carries the young.
Ray
Flattened cartilaginous fish related to sharks.
Eel
Elongated true eels (Anguilliformes), using the moray eel.
Pufferfish
Tetraodontidae — inflating fish, many of them highly toxic.
About Fish Profiles
Fish profiles on FaunaHub cover classification, appearance, habitat, diet, and behaviour, with cautious, source-reviewed wording. Where a common name spans many species — such as "tetra", "catfish", "ray", or "pufferfish" — the page is a group-level overview rather than a single-species account, and a representative reference species is named. Conservation status varies by species and should be checked against current authoritative sources.