This document discusses different types of fish and their composition. It begins by outlining three learning objectives about distinguishing fish types, understanding their composition, and knowing market forms of fish. It then defines different types of fish like bony fish, jawless fish, and cartilaginous fish. The document outlines the structure of fish and identifies parts like the mouth, eyes, fins, and scales. It details the composition of fish including protein, fat, vitamins, minerals, and carbohydrates. Characteristics of fresh and stale fish are provided. Finally, different market forms of fish are defined like whole, fillet, steak, and various new fishery products and byproducts are listed.