Breeding, growth and exploitation of Brachyplatystoma rousseauxii Castelnau, 1855 in the Caqueta River, Colombia
Breeding, growth and exploitation of Brachyplatystoma rousseauxii Castelnau, 1855 in the Caqueta River, Colombia
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DOI：
10.1590/s1679-62252013000300017
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发表时间：
2013-09-01
影响因子：
1.7
通讯作者：
Duponchelle, Fabrice
中科院分区：
文献类型：
--
作者：
Córdoba, Edwin Agudelo;León, Ángela Viviana Joven;Duponchelle, Fabrice
对哥伦比亚卡克塔河亚马逊河洄游性大鲶鱼Brachyplatystoma rousseauxii的主要生活史特征进行了测定。繁殖季节发生在上升和下降的水期间。首次性成熟时，雌性（88.5 cm Ls）明显大于雄性（81.7 cm）。雄性和雌性在第三年和第四年之间进行第一次繁殖。生长特性估计使用长度频率分析。雌性比雄性长得更大，第一年后差异约为9%，十岁个体的差异增加到12%。根据不同的模型计算的死亡率估计数，有些考虑到了身体大小的影响，自然死亡率为0.32至0.42年（-1），捕捞死亡率为0.72至0.82年（-1），表明卡克塔河的捕捞压力很大，高于秘鲁亚马逊河。由此产生的开发率（0.63至0.72）表明，在卡克塔的物种过度开发。这种情况要求共享这一资源的国家（巴西、哥伦比亚和秘鲁）之间进行协调一致的管理，并提出了可能的解决办法。
The main life history traits of the large Amazonian migratory catfish Brachyplatystoma rousseauxii were determined in the Caqueta River, Colombia. The breeding season occurred during the rising and falling water periods. The size at first sexual maturity was significantly larger for females (88.5 cm Ls) than males (81.7 cm). Both males and females reproduce for the first time between their third and fourth year. The growth characteristics were estimated using length frequency analyses. Females grew systematically larger than males, the difference being about 9% after the first year and increasing to 12% for ten years old individuals. Mortality estimates, calculated from different models, some taking into account the effect of body size, ranged from 0.32 to 0.42 year(-1) for natural mortality and from 0.72 to 0.82 year(-1) for fishing mortality, indicating high fishing pressure in the Caqueta River, higher than in the Peruvian Amazon. Resulting exploitation rates (0.63 to 0.72) pointed towards overexploitation of the species in the Caqueta. The situation calls for a concerted management between the countries sharing this resource (Brazil, Colombia, and Peru) and potential solutions are proposed.