Population dynamics and stock assessment of Colossoma macropomum caught in the Manacapuru Lake system (Amazon Basin, Brazil)
Population dynamics and stock assessment of Colossoma macropomum caught in the Manacapuru Lake system (Amazon Basin, Brazil)
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DOI：
10.1111/fme.12139
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发表时间：
2015-10-01
影响因子：
2
通讯作者：
Freitas, C. E. C.
中科院分区：
文献类型：
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作者：
Campos, C. P.;Sousa, R. G. Costa;Freitas, C. E. C.
巨盖鱼（Colossoma macropomum）是亚马逊河流域第二大的有鳞鱼类。近几十年来的减产表明，该物种的种群在某些地区已经被过度开发。本研究对黑腹锦鸡儿的种群动态进行了研究。利用马纳卡普鲁湖系统中捕获的鱼的长度和重量数据，对大鳞鱼进行了调查，马纳卡普鲁湖系统是一个位于沿着索利莫伊斯河下游的大型里亚湖。共采集到1270株C.对标准长度为17 - 62 cm，平均长度为31.0 +/-6.7 cm的大果壳进行取样。体重范围为165 - 8195 g，平均体重为1148.3 ± 883.8 g。最大可持续产量估计为285.8克补充量（-1），相当于0.51年的捕捞死亡率（-1）。根据捕捞死亡率和初次捕捞年龄这两个可能由捕捞管理战略处理的参数的变化进行的情景分析表明，捕捞产量的任何提高都取决于初次捕捞年龄的提高。
Colossoma macropomum is the second largest scaled fish in the Amazon basin. Reduced harvests in recent decades suggest that populations of this species are already overexploited in some areas. In this study, the population dynamics of C. macropomum was investigated using length and weight data for fish caught in the Manacapuru Lake system, a large ria lake located along the lower reach of the Solimoes River. A total of 1270 individuals of C. macropomum with standard lengths varying from 17 to 62 cm and mean length of 31.0 +/- 6.7 cm were sampled. Weights varied from 165 to 8195 g, and mean weight was 1148.3 +/- 883.8 g. Maximum sustainable yield was estimated at 285.8 g recruit(-1), corresponding to a fishing mortality of 0.51 year(-1). A scenario analysis based on changes in fishing mortality and age at first capture, two parameters potentially addressed by fishing management strategies, suggested that any improvement in fishing yield depends on increases in age at first capture.