鲶鱼保护、生态与管理:第二届国际学术研讨会

加利福尼亚东南海湾Chihuil海鲶鱼繁殖生物学的观察:对管理的影响

Victor Muro和Felipe Amezcua

doi:https://doi.org/10.47886/9781934874257.ch28

摘要. - chihuil海鲶Bagre自治区panamensis是一种重要的被商业开发的物种。目前，该物种被认为具有相对较高的丰度。然而，关于该物种的生物学研究很少;因此，墨西哥没有针对这一物种的收割规定。这项工作的目的是描述这一物种的繁殖生物学，作为管理这一资源的初步基础，评估目前的捕鱼做法是否会对其种群产生影响，最后，开始促进对这一种群的有效管理。刺网取样于2008年10月至2009年10月进行。所有的鱼都被解剖;从宏观上测定性别和性腺成熟期。结果表明，产卵季节为5 - 8月，性腺发育大体同步。chihuil海鲶鱼的繁殖力为36，这是低的，因为该物种通过口服孵化鱼苗表现出亲代照顾，降低了死亡率。 Estimated length at first maturity is 350 mm total length (TL). Average length at first catch from the artisanal gill-net fishery is 300 mm TL, indicating that this fishery is harvesting fish that have yet to have had a single reproductive event. A large number of captured fish consisted of males that were incubating fry, thus, likely causing large fry mortality. Current harvest practices may have a negative effect on the chihuil sea catfish population in the Gulf of California. A closed season is proposed for this species from May to August with a minimum harvest length of 400 mm TL.