조피볼락, Sebastes schlegeli의 成長 및 體成分 組成에 미치는 미역添加 飼料의 生理的 效果

Abstract

In order to find out physiological effects of diets supplemented with seamustard(undaria pinnarifida) powder on the young rockfish Secasied schlegeli, investigations of growth, survival rates, body compositions and blood properties were performed for 140 days under the condition of four experimental diets. 0%, 3%, 5% and 7% supplement of seamustard powder. In addition, the tests on tolerance of fishes against low oxygen concentration and starvation carried out after the rearing experiment.

1. The fishes fed diet supplemented with 5% of seamustard powder revealed the best results in growth of total length and body weight. 2. Crude lipid contents in the whole viscera of fishes fed diets supplemented with seamustard powder were higher than those of fishes fed diet without seamustard powder, while the contents of moisture, crude protein, crude lipid and crude ash in dorsal muscle did not show the notable difference among the diet groups with or without seamustard powder. 3. Hematocrit and mean number of red blood cell in fishes fed diets supplemented with seamustard powder was elevated, despite of no notable changes in mean corpuscular volume, mean corpuscular hemoglobin and mean corpuscular hemoglobin concentration. 4. The resistant power of the fishes against low oxygen concentration was elevated by feeding seamustard powder. 5. Upon starvation of the fishes for 31 days, body weight loss of the fishes fed diets supplemented with seamustard powder was lower compared with the fishes fed diets without seamustard powder. 6. It was suggested that the proper rate of seamustard supplement diet for the young rockfish was 5%.