Changes in oxygen consumption and ammonia output in young Siberian sturgeon (Acipenser baeri)
2000
Szczepkowski, M. | Szczepkowska, B. (Inland Fisheries Inst. Pieczarki (Poland). Experimental Hatchery "Dgal") | Kolman, R.
Studies on changes in oxygen consumption and ammonia output were carried out during Siberian sturgeon (Acipenser baeri) fry rearing in water recirculation system. Fish weight increased from 0.8 to about 450 g. It was found that fed fish usually showed two peaks of oxygen consumption and ammonia output within a day. Maximal levels of these parameters were usually observed in the afternoon, between 17.00 and 18.30 hours, and by night, between 23.00 and 3.30 hours. Starving fish, on the other hand, showed increased oxygen consumption (from 5.9 to 37.5 %) and more intensive ammonia output (from 1.5 to 26.5 times higher) by night. As the fish grew, mean oxygen consumption by the fry decreased, from 756.2 to 154.2 mg/kg/h, and so did the intensity of ammonia output, from 67.7 to 1.7 mg/kg/h. Mean oxygen consumption by starving fish was lower by 40-60 % compared to fed fish, and ammonia excretion by 60-80 %.
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