A fish is an aquatic, anamniotic, gill -bearing vertebrate animal with swimming fins and a tough cranium to protect the brain, but lacking limbs with digits.

Jan 31, 2026 · A fish is any of approximately 34,000 species of vertebrate animals found in the world’s fresh and salt waters. The term fish is applied to a variety of vertebrates of several evolutionary lines. …

Jul 28, 2022 · The ultimate guide to fishes & fish life, including definition of a fish, fish bodies, types of fish and the life-cycle of a fish. Read on for a complete guide to ichthyology…

All fish share two traits: they live in water and they have a backbone—they are vertebrates. Apart from these similarities, however, many of the species in this group differ markedly from one...

Jan 3, 2023 · Instead, there are 3 main classes, groups, or types of fish: bony fish (Osteichthyes), jawless fish (Agnatha), and cartilaginous fish (Chondrichthyes). Fish are the most diverse group …

Fish are diverse aquatic animals with various species, shapes, and sizes, inhabiting oceans, rivers, and lakes worldwide, and playing vital roles in ecosystems.

Fish are aquatic vertebrate animals that have gills but lack limbs with digits, like fingers or toes. Recall that vertebrates are animals with internal backbones.

Explore facts and photos about fish found in and around the United States. Learn about their range, habitat, diet, life history, and more.

May 21, 2024 · Fish are aquatic vertebrates that typically have gills, fins, and a streamlined body. They inhabit diverse environments, from freshwater rivers and lakes to salty oceans and deep seas.

There's plenty of fish in the sea, and scientists at NOAA Fisheries study a lot of them! Here we've gathered answers to some of the questions we get most frequently about the fish we study.