Dec 21, 2025 · A fish is any of approximately 34,000 species of vertebrate animals (phylum Chordata) found in the fresh and salt waters of the world. Living fish species range from the …

A fish is an aquatic, anamniotic, gill -bearing vertebrate animal with swimming fins and a hard skull, but lacking limbs with digits. Fish can be grouped into the more basal jawless fish and …

Learn all about Fishes - what is a fish, their evolution, anatomy, characteristics, life cycle, adaptations, and much more - with pictures.

Sep 25, 2025 · Fishes (class Pisces) are an incredibly diverse superclass of cold-blooded, aquatic vertebrates distinguished by a streamlined body, fins for propulsion and steering, and gills for …

Fishes have a wide range of diets, including plankton, algae, fish, seals, and turtles. Some fishes are parasites, some are blind, some are venomous, and some can even produce electricity.

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...

There are more than 32,000 described species of fishes, more than all the amphibians, reptiles, birds, and mammals combined. Fishes are an important food resource worldwide, and fishing …