1) Studies plants and animals living in water, and environmental conditions affecting them: Investigates salinity, temperature, acidity, light, oxygen content, and other physical conditions of water to determine their relationship to aquatic life.
2) Examines various types of water life, such as plankton, worms, clams, mussels, and snails.
3) May specialize in study of salt water aquatic life and be designated Marine Biologist; or fresh water aquatic life and be designated Limnologist.
4) May specialize in culture, breeding, and raising of aquatic life, such as shrimp, lobsters, clams, oysters, or fish, and commercial fish farm operations and be designated Aquaculturist.
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