The Species Composition and Distribution of Fish and Prawn in the Bed of the Lower Amur River

Koshelev V. N.; Kolpakov N. V

摘要

The distribution of fish and prawn in the bed of the lower Amur River (within 40-960 km from the mouth) is described based on the results of a beam-trawl survey (57 trawl taw at depths of 1.5-23.0 m) conducted in September and October 2003. A total of 2584 ind. of 22 fish species and 1077 ind. of one invertebrate species (the prawn Palaemon modestus) were caught. The most frequently occurring fish species were members of the orders Cypriniformes (13 species) and Siluriformes (4 species). The total number of benthic and demersal fish was estimated at 32.161 million ind.; the total number of prawn was estimated at 4.887 million ind. The most abundant fish were two commercial catfish species: the Brazhnikov's catfish Tachysurus brashnikowi (estimated at 16.26 million fish) and the Chinese catfish T. sinensis (4.32 million fish). The abundance of both fish and prawn increased by many times towards the mouth of the Amur, which correlated with the increasing biomass of the benthic food supply in the same direction. The total biomass of fish and prawn equaled 583.8 and 8.8 t, respectively. The fish biomass varied in the 0.012-2.572 g/m(2) range (with an average of 0.450 +/- 0.270 g/m(2)) and the prawn biomass varied within 0.005-0.044 g/m(2) (0.021 +/- 0.012 g/m(2)). The major portion of the fish biomass (82.4%) was recorded mainly from the lower reaches of the Amur River (40-400 km from the river mouth); the entire prawn biomass was concentrated in the lower reaches (50-150 km from the mouth). The following fish species were dominant in catches in terms of biomass: Chinese catfish (32.9%), Brazhnikov's catfish (24.0%), Chinese lizard gudgeon Saurogobio dabryi (12.6%), Ussuri catfish T. ussuriensis (9.7%), Amur whitefin gudgeon Romanogobio tenuicorpus (7.8%), Amur sturgeon Acipenser schrenckii (5.6%), Siberian gudgeon Gobio cynocephalus (2.4%), and kaluga Huso dauricus (0.6%).

机译：基于梁拖网调查的结果（57次拖网Taw在1.5-23.0米的深度为1.5-23.0米）的结果，描述了鱼类和虾的分布（距离嘴巴40-960千米） 2003年9月和10月。共有2584型IND。 22种鱼类和1077 Ind。一个无脊椎动物（虾Palaemon Modestus）被抓住了。最常见的鱼类是荨麻疹（13种）和硅的成员（4种）。底栖和脱歧鱼的总数估计为321.61亿ind;虾总数估计为48.87亿天。最丰富的鱼是两只商业鲶鱼种类：巴西鲶鱼Tachysurus Brashnikowi（估计为1626万条鱼）和中国鲶鱼T. Sinensis（4.32亿鱼）。朝向Amur的口腔增加了多次鱼和虾的丰富，这与弯曲食品供给的增加的生物量相关联。鱼类和虾的总生物质分别平均583.8和8.8吨。鱼生物量在0.012-2.572g / m（2）范围内（平均为0.450 +/- 0.270g / m（2）），并且虾生物质在0.005-0.044g / m（2）内变化（0.021 +/- 0.012 g / m（2））。鱼生物量的主要部分（82.4％）主要从阿穆尔河下游记录（距离河口40-400公里）;将整个虾生物质浓缩在下游（距离嘴50-150千米）。以下鱼类在生物量方面占据占主导地位：中国鲶鱼（32.9％），巴西尼科夫的鲶鱼（24.0％），中国蜥蜴糖果豆群Dabryi（12.6％），Ussuri Catfish T. Ussuriensis（9.7％），阿穆尔白芬欺骗Romanogobio Tenuicorpus（7.8％），Amur Sturgeon Acipenser Schrenckii（5.6％），西伯利亚艺术队（5.6％），西伯利亚艺术队鹅虫（2.4％）和Kaluga Huso Dauricus（0.6％）。

The Species Composition and Distribution of Fish and Prawn in the Bed of the Lower Amur River

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