Comparison of Physiological Responses to Exposure to Chattonella marina in Yellow tail, Red Sea Bream and Japanese Flounder

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  • Comparison of Physiological Responses to Exposure to <i>Chattonella marina</i> in Yellowtail, Red Sea Bream and Japanese Flounder

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We compared tolerance of three aquaculture fishes (yellowtail, red sea bream and Japanese flounder) to Chattonella marina, and studied physiological responses to exposure to the alga. Resting oxygen uptake (Mo2) was also determined for the three species. All yellowtails were killed by exposure to C. marina, whereas mortality was 33% and 0% for bream and flounder, respectively. Arterial oxygen pressure (Pao2) declined rapidly in yellowtail and bream soon after the onset of the exposure. The Pao2 gradually fell and remained lower than the control values in two flounders, whereas it was close to the pre-exposure levels in the other four flounders at the end of the exposure. Ventilatory response during C. marina exposure was consistently intense in yellowtail, variable among individuals in bream while nearly absent in flounder. Resting Mo2 was highest in yellowtail, and lowest in flounder. We consider that the observed difference in tolerance to C. marina resulted from the different oxygen requirements of the species and their physiological responses in hypoxia (oxygen regulator/conformer). It appears that venous oxygen extraction as a means to maintain oxygen uptake during hypoxia does not function efficiently in fish with a higher oxygen requirement like yellowtail.

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