FISH INTRODUCTION

FISH INTRODUCTION

DESCRIPTION

FISH

A fish is an aquatic, 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 the more common jawed fish, the latter including all living cartilaginous, and bony fish. In a break to the long tradition of grouping all fish into a single class (Pisces). Most fish are cold-blooded, their body temperature varying with the surrounding water, though some large active swimmers like white shark and tuna can hold a higher core temperature.