Piscivorous Habits of Spanish Mackerel Larvae in the Seto Inland Sea
Piscivorous Habits of Spanish Mackerel Larvae in the Seto Inland Sea
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濑户内海鲭鱼幼虫的食鱼习性
DOI：
10.2331/fishsci.63.388
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发表时间：
1997
影响因子：
1.9
通讯作者：
Masaru Tanaka
中科院分区：
文献类型：
--
作者：
J. Shoji;T. Kishida;Masaru Tanaka
1981-1983年在濑户内海采集了100尾卵黄囊仔鱼和376尾鲅鱼仔鱼的胃内容物。猎物的标准长度（SL）由它们的身高（BH）反算。晚期卵黄囊幼虫有眼色素沉着，有颚齿和胃盲囊，部分已开始摄食。幼虫的胃内容物主要由仔鱼组成，但在一些早期幼虫中观察到无脊椎动物。西班牙马鲛幼鱼的主要猎物是鲱形目幼鱼，其中21%为日本鱼（占已鉴定鲱形目的93%）。头长（HL），上颚长（UJL），体高（BH）的比例，SL的西班牙鲭鱼幼虫的大小增加，直到11毫米SL，然后保持不变。在12 mm SL时，日本鱼仔鱼的最大体长和体长范围逐渐增大。体长大于12毫米的鲭鱼幼虫以8-12毫米的日本鲭鱼幼虫为食。幼虫早期取食率高，体长4-5、5-6和6- 7 mm幼虫分别为66%、84%和92%。这些结果表明，西班牙鲭鱼幼虫收集在濑户内海积极喂养主要是从第一个喂养阶段的鱼苗。
The stomach contents of 100 yolk-sac larvae and 376 larvae of Spanish mackerel collected in the Seto Inland Sea from 1981-1983 were examined. Standard lengths (SL) of prey animals were back-calcu lated from their body heights (BH). Late stage yolk-sac larvae with eye pigmentation had jaw teeth and gastric blind-sac, and some of them had already initiated feeding. Stomach contents of larvae consisted primarily of fish larvae, though invertebrate zooplanktons were observed in some early stage larvae. Main prey of Spanish mack erel larvae were larval Clupeiformes, 21% being Japanese anchovy (93% of identified Clupeiformes). The ratios of head length (HL), upper jaw length (UJL), and body height (BH) to SL of Spanish mackerel larvae increased as larval size increased until 11 mm SL, then remained constant. The back-cal culated maximum size and the size range of Japanese anchovy larvae eaten by Spanish mackerel larvae increased until 12mm SL. Spanish mackerel larvae larger than 12mm SL fed on 8-12 mm SL Japanese anchovy larvae. The feeding incidence was high for early larval stages: 66,84, and 92% in 4-5, 5-6, and 6-7mm SL larvae, respectively. These results suggest that Spanish mackerel larvae collected in the Seto Inland Sea actively fed mainly on fish larvae from the first feeding stage.