Main category in which fish and shell fish are divided?
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Most vertabrate fish -- salmon, trout, tuna and so on -- are of Class Teleostomi, Phylum Chordata -- these are the bony fishes.

Shark and rays are of class chondricthyes, in that their skeletal systems aren't bone -- they're cartilege instead.

Shellfish generally refers two different phyla: Arthropoda (crabs, lobsters, crawfish, etc -- characterized by a hard exoskeleton) and Mollusca (clams, mussels, abalone, etc.)

The primary distinctions are that chordates (fish and shark) have a notochord or spinal chord and an endoskeleton. Arthropods do not have a notochord, have an exoskeleton, and also have striated as well as smooth musculatur. Molluscs often have shells (but not all -- consider the octopus or squid), do not have a notochord, and do not have striated muscles.

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