黄海産若齢マダイの摂餌生態について

概要

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In the present paper the author has qualitatively and quantitatively analysed the feeding habits of the sea bream, Chrysophrys major TEMMINICK et SCHLEGEL, with special reference to the daily change of the feeding activity, based on the stomach contents of the 856 individuals, which were caught by bull-trawler at the 352nd official block in the Yellow Sea, during the period from November 18 to 19 in 1964. These samples were obtained continuously (Table 1, Fig. 1). Summarizing the results of the investigation, three conclusions were derived as follows: 1) As the results of the qualitative and quantitative analyses, it was recognized that the small macrura was the most important food organism of the young sea bream (Table 2, Fig. 2). 2) The degree of digestion of the food found in the stomach was high during the night and low in the daytime (Fig. 3). The fish caught in the daytime has more stomach contents than that caught during the night (Fig. 4). 3) The above facts suggested that the young sea bream take their food during the morning and the food taken may be digested until the next morning. Thus, it may be concluded that the young sea bream follows a feeding rhythm during the course of a day.
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