Question

fish can ventilate in denser water with limited oxygen

Answer 1

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Here is ur answer..

Fish reacted to low oxygen concentration with wider expansion of opercula (but not with increasing beat rate), leading to an increase in ventilation volume. As expected, the intensity of infection increased with decreasing oxygen saturation—probably due to a higher exposure to cercariae caused by increased ventilation under low oxygen concentrations.

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Answer 2

Fish reacts to low oxygen concentration with wider expansion of opercula (but not with increasing beat rate)which, leading to an increase in ventilation volume. As expected, the intensity of infection increased with decreasing oxygen saturation— due to a higher exposure to cercariae caused by increased ventilation under low oxygen concentrations.