養殖ハマチの赤血球数と血色素量

概要

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In 1970 and 1971 the blood were sampled and tested soon after the fish were brought to the laboratory. In 1972 and 1973 the tests were carried out immediately after the fish were angled out from floating cages. The fish specimens were all cultured 0-year yellow-tail (Seriola quinqueradiata) fed on a diet of raw fish. The study revealed that erythrocyte count, hemoglobin level and color index (MCH) increased with growth, reaching a maximum in autumn and then decreasing inwinter. Between erythrocyte count, hemoglobin level, serum protein level, color index and ROHRER index, correlationships were or not observed depending on the combination of the parameters or the year. Higher values of erythrocyte count and hemoglobin level was recorded in 1970 and 1971 than in 1972 and 1973. This is ascribed to the handling of fish before blood sampling, without any parallelism with the other parameters such as body growth curve, growth rate, specific growth rate, ROHRER index or serum protein level. It is proposed that blood sampling should be made immediately after the fish is angled, without any handling such as netting or trans-porting. Changing the diet from raw fish to compounded diet resulted in a decrease in the erythrocyte count and hemoglobin level, with a greater decline in the younger than the older fish.
日本水産學會の論文