Population dynamics of Prochilodus nigricans (Characiformes: Prochilodontidae) in the Putumayo River

ABSTRACT The black prochilodus (Prochilodus nigricans) is one of the most landed scaled fish species of the middle and upper parts of the Putumayo River, in the tri-national area between Colombia, Ecuador and Peru. Despite its importance, biological information about this species is too scant to guide fisheries management in this portion of the Colombian Amazon. In this study, 10884 individuals were sampled in the fish markets of Puerto Leguízamo between 2009 and 2017. This sampling was used to document reproductive patterns, but also growth and mortality parameters from length frequency distributions. The size at which all fish were mature was 22 cm Ls, which should be the established as the minimum size of capture to ensure that all fish have had a chance to reproduce before being caught. Growth and mortality parameters indicated a slower growth in the Putumayo than in other Amazonian rivers and a relatively high exploitation rate.

摘要：黑普罗奇卢杜斯鱼（Prochilodus nigricans）是哥伦比亚、厄瓜多尔与秘鲁三国交界区域内普图马约河中上游河段渔获量最高的有鳞鱼类之一。尽管该物种具有重要经济价值，但相关生物学资料极为匮乏，难以指导哥伦比亚亚马逊流域该河段的渔业管理工作。本研究于2009年至2017年间，在波多黎各莱吉萨莫的鱼市中采集了10884尾个体样本，本次采样既用于记录该物种的繁殖模式，也通过体长频率分布分析了其生长与死亡参数。该物种所有个体的性成熟体长均为22 cm Ls，该体长应被确立为最小可捕体长，以确保所有个体在被捕捞前均已获得繁殖机会。生长与死亡参数分析结果显示，普图马约河种群的生长速度较亚马逊其他河流更为缓慢，且捕捞开发率相对较高。