Application of hydroacoustics to investigate the distribution, diel movement, and abundance of fish on Zhubi Reef, Nansha Islands, South China Sea

文献类型： 外文期刊

第一作者： Zhang Jun

作者： Zhang Jun;Chen Guobao;Chen Zuozhi;Qiu Yongsong;Xiong Dan;Zhang Jun;Chen Guobao;Chen Zuozhi;Xiong Dan

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关键词： coral reef; fish; hydroacoustic technique; diel vertical movement; abundance

期刊名称：CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY （ 影响因子：1.068； 五年影响因子：0.983 ）

ISSN： 0254-4059

年卷期： 2016 年 34 卷 5 期

页码：

收录情况： SCI

摘要： A combination of traditional fish sampling methods (hand-line and gill net) and modern hydroacoustic techniques were used to study fish community structure, distribution, and diel movements of fish on Zhubi Reef to enhance understanding of the ecosystem. We collected 126 individuals from 29 species, 20 genera, 17 families, three orders, and two classes using traditional gear. Perciforms were the dominant group in terms of species richness and biomass. The acoustic data indicated that very small (target strength [TS], dB) <-60 dB) and small (-60 dB <= TS<-45 dB) fish contributed the most to abundance and species richness on the coral reef, and that the proportion of medium-sized (-45 dB <= TS<-35 dB) and large-sized (-35 dB <= TS) fish increased gradually as depth increased. The single-target detection method revealed two distinct size classes during the day in the 12-16 and 16-20-m layers. One group consisted of very small-sized fish (TS<-60 dB) and the other consisted of medium and large-sized fish (TS>-55 dB). The number of single-target detections was significantly higher during the night than during the day (P<0.05). The single-target TS frequency distribution during the day was significantly different than during the night at depths of 4-8, 8-12, 12-16, and 16-20 m. Significant differences were observed among the 4-8, 8-12, 12-16, and 16-20-m-depth layers during day and night. Diel vertical movement was evidenced as fish began to spread and move upward just before sunset and began to assemble and descend shortly (15 min) after sunrise.

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