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Parasite
- organism living in or on another organism from which it obtains food
Pectoral fins
- located just behind the gill openings (head of the fish)
Pelvic fins
- pair of fins on the lower body of a fish; also called ventral fins
Pharynx
- part of the gut between the mouth and the esophagus into which open gill slits
Physiological
- the processes which operate in an organism
Population
- a single species; for example: a population of walleye
Predatory fish
- any fish that prey on other living animals, particularly other fish
Protozoan
- a protist with animal-like characteristics
Pyloric caeca - finger-like projections at the upper end of the intestine and close to the stomach; aid in the absorption of food in the intestine and serve as a temporary storage space
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