Feeding Habits and Trophic Level of Juvenile Greater Amberjack, Seriola dumereili (Carangidae) in the Southern Waters of Korea

IF 0.5 4区 生物学 Q4 FISHERIES Journal of Ichthyology Pub Date : 2023-12-29 DOI:10.1134/s0032945224010132
D. G. Kim, H. Y. Soh, G. W. Baeck
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Abstract

Feeding habits and trophic level of juvenile greater amberjack, Seriola dumerili were studied using 170 specimens collected by set net fishery and lure fishing in the southern waters of Korea during July, August, September, October, and November 2022. The size of juvenile greater amberjack ranged from 17.5 to 49.9 cm in fork length. Juvenile greater amberjack was piscivorous predator that feed primarily on fish. We calculated the trophic level as 4.06 ± 0.80 for juvenile greater amberjack. Fishes were the main prey items for all size groups. Juvenile greater amberjack also showed size-related dietary shift from Japanese anchovy to jack mackerel. As the fork length of juvenile greater amberjack increase, the mean weight of prey per stomach tended to increased, while the mean number of preys per stomach was not significantly different. Fishes were the main prey items for summer and autumn. The main fish prey during summer and autumn was Japanese anchovy, but in the autumn, the Japanese anchovy portion decreased, and the jack mackerel portion increased. PERMANOVA analysis was used to examine seasonal and size-related changes in diet composition, which showed significant variations among size classes. Juvenile greater amberjack presumably feed on larger prey to meet their energy requirements.

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韩国南部水域大琥珀鱼(鲤科)幼鱼的摄食习性和营养级
摘要 利用2022年7月、8月、9月、10月和11月在韩国南部海域通过定置网捕捞和诱饵捕捞采集的170个标本,研究了大琥珀鱼幼鱼的摄食习性和营养级。大琥珀鱼幼鱼的叉长从 17.5 厘米到 49.9 厘米不等。大琥珀鱼幼鱼是以鱼类为主要食物的食性捕食者。经计算,大琥珀鱼幼鱼的营养级为 4.06 ± 0.80。鱼类是所有体型组的主要猎物。大琥珀鱼幼鱼的食性也表现出与体型相关的变化,从日本鳀鱼转向鲭鱼。随着大琥珀鱼幼鱼叉长的增加,每个胃中猎物的平均重量有增加的趋势,而每个胃中猎物的平均数量没有显著差异。鱼类是夏季和秋季的主要猎物。夏季和秋季的主要鱼类猎物是日本鳀鱼,但在秋季,日本鳀鱼的比例下降,而竹荚鱼的比例上升。采用 PERMANOVA 分析方法研究了食性组成与季节和大小相关的变化,结果表明不同大小级别之间存在显著差异。推测大琥珀鱼幼鱼摄食较大的猎物以满足其能量需求。
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来源期刊
CiteScore
1.00
自引率
28.60%
发文量
96
期刊介绍: Journal of Ichthyology is an international peer-reviewed journal published in collaboration with the Russian Academy of Sciences. It covers original studies in fish taxonomy, evolution, molecular biology, morphology, species diversity, zoological geography, genetics, physiology, ecology, behavior, reproduction, embryology, invasions, and protection. Some problems of applied ichthyology are also covered. The journal welcomes manuscripts from all countries in the English or Russian language.
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