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To determine the ability of the king angelfish Holacanthus passer to digest algae, three algal species were immersed in acidic conditions similar to that found in the stomach of fish. Only one of them was not susceptible to acidic lysis; two were affected after 40 and 60min at pH2.0. King angelfish have an expanded region of the intestine called here the hindgut chamber (HC) containing populations...
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