Aeration of lab cultures of this organism is sometimes inadvisable as bubbles will force them to float. For 10 points each:
[10h] What tiny crustacean is often used as a test organism in water quality testing? The transparency of these water fleas allows the observation of ephippia that may develop in adverse conditions.
ANSWER: Daphnia magna [or Daphnia magna]
[10e] Daphnia magna primarily inhabit this kind of water that is less saline than seawater or brackish water, seen in lakes and rivers. The American paddlefish lives in this kind of water.
ANSWER: freshwater
[10m] These invasive fish in North America have prompted the use of electrification of waterways to stop their spread to the freshwater Great Lakes. A large species of these fish has a tendency to leap out of the water when startled.
ANSWER: Asian carp [accept bighead carp or black carp or grass carp or silver carp]
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