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Aquatic vertebrates which possess fins for appendages.  Make up the largest group of vertebrates. Are divided into two groups depending on the composition of their skeleton bony or cartilaginous. Bony fish have skeletons made of bones, such as trout and catfish. Cartilaginous fish have skeletons composed of cartilage such as sharks and rays.

Anatomy
Caudal fin
dorsal fin
lateral line
eye
mouth
operculum
pectoral fin
pelvic fin
scales
andal fin

Scales
Found on most fish, on bony fish are made of bone and resemble roof shingles, are called dermal denticles in sharks and re tiny tooth like structures found in the skin

Fins
Move to stabilized and protect fish. May be paired or unpaired. Are flexible in body fish and stiff in cartilaginous fish

Gills
Allow oxygen to enter the bloodstream. Are found alongside head. Usually bright red in color due to the large amount of blood present.

External Features
Relate to the fish's Style. Include the following, body shape, mouth location, tail shape.

Body Shapes
Includes the following, Fusiform, laterally compressed, depressed, and eel-like

Fusiform Fish
Swim very fast, live in open water, include the barracuda.

Laterally Compressed Fish
Possess bodies which are compressed from side to side. Do not swim very fast but are very maneuverable. Includes Flounders

Depressed Fish
Have Bodies which are depressed from top to bottom. Usually live on or near the bottom of the body of water. Include stingrays

Eel-Like Fish
Resemble snakes, Includes electric eels.

Mouth Location
Terminal: Located at the end of the head and are used for chasing or capturing.
Superior: Possesses a long, lower jaw and is located toward the top of the head; includes the tarpon
Sub-terminal: Located toward the bottom of the head and usually feed on the sea floor; including the bonefish
Specialized: mouths which do not fit these categories, such as a seahorse which possess a straw- like snout

Tail Shape
Crescent, forked, rounded

Crescent
Account for fast swimmers. Allows fish to be constantly active. Are Found on the swordfish

Forked Tails
May allow for fast or slow swimming. Determine speed based on the depth of the fork. Are Found on the striped bass

Rounded Tails
Usually cause fish to swim slowly. Allow for short burst of speed. Are found on angelfish.

Internal Anatomy
Spine
Brain
Lateral Line
Swim Bladder
Kidney
liver
Heart

Spine
Provides the primary structural framework. Connects the skull to the tail. Comprised of many vertebrae which house and protect the spinal cord

Brain

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Invertebrates, Soft bodied animals with a hard shell, includes scallops, clams, and oysters.

Hard outer shell. Divided into two body regions, The head-foot and the visceral
mass

Head Foot
The most easily seen, Most muscular organ covered in cilia and mucous cells. Normally consists in a tail at one end and a ahead the other. May be drawn up in the shell. Allows for movement

Visceral Mass
Accounts for the rest of the body. is entirely non-muscular. Contains organs used in digestion and reproduction, including, kidney, heart, and gonads.

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Encephalon: Where mental function takes place
Extensor Muscle: Extends the tail
Flexor Muscle: Bends tail
Heart: Pumps blood throughout body
Stomach: Houses and breaks down food
Ventral Nerve Cord: Collection of nerves in the abdomen

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Composed of 3 parts in crustaceans, head, thorax, and abdomen. Usually form a cephalothorax in adult crustaceans, meaning thorax and head are fused

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Used for walking and swimming. May be either uniramous or biramous

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Paired with appendages located at the front most segment of arthropods. Are uniramous in the first pair and biramous in the rest on crustacean.

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Hard external covering which provides protection and support for an organism.
It's made of chitin, a substance which forms hard, semi transparent material. Does not allow for continuous growth of the exoskeleton undergoes molting

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Exoskeleton, antennae, jointed legs, segmented bodies, and bilateral symmetry

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Crustaceans in the larvae stage.
Characterized by unsegmented body, median eye, and three part appendages.

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Chiefly Aquatic organisms which have a hard shell or crust covering their body. Belong to the phylum arthropoda and class crustacea. Includes Lobsters, crabs, shrimp, and barnacles