肯尼亚米达溪手工鱼饵渔民捕捞的鱼的形态计量学和发育特征

Kihia Charles Maina, Hendrick Yvone, M. Agnes, Okondo Julius, Nthiga Aniel, N. Vincent
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引用次数: 2

摘要

尽管手工商业渔民和渔网渔民的捕捞受到了关注,但关于饵料渔民捕捞的形态计量学记录却很少。尽管这些数据对于推断鱼类种群的生长和发育状况很重要,以便减少过度捕捞未成熟和多产的鱼类。本研究比较了以多毛类和寄居蟹为饵的钩钩渔具和以腹足类为饵的渔具的鱼种、大小和重量,以及由此得出的鱼体状况、性腺指数和渔捞指数。结果表明,渔民在相似条件下有20多种鱼,GSI低于1,捕捞指数低于20%。生长指标的变化在很大程度上归因于物种的特异性差异,高价值的顶端捕食者(如carangidae)的形态测量值低于体型较小的永久溪流和红树林居民。通过关闭、替代生计和自愿释放未成熟鱼种的参与性努力控制,加上限制使用小型网眼陷阱和鱼钩,可能会减少未成熟鱼种的收获,并改善未来的捕捞和渔业的可持续性。关键词:饵料,条件因子,渔具,性腺指数,捕捞指数,未成熟。
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Morphometric and developmental characteristics of fish landed by artisanal bait fishers at the Mida Creek, Kenya
Although artisanal commercial and net fishers landings has received attention, the morphometrics of bait fisher landings is poorly documented. This is in spite of the importance of such data to infer fished stock growth and developmental status in order to reduce excessive removal of immature and highly fecund fish. This study compares fish species, size and weight, and derived fish condition, Gonadosomatic and Fishing Indices, between hook and line gear baited with polychaetes and hermit crabs, and traps baited with gastropods. Results indicate fishers land over 20 fish types with similar condition and GSI below unity and fishing index of below 20%. Variation in growth indicators was largely attributed to species specific differences, with high value apex predators, such as carangidae, having lower morphometrics than smaller bodied permanent creek and mangrove residents. Participatory effort controls through closure, alternative livelihoods, and voluntary release of immature, coupled with limiting the use of small mesh traps and hooks, may reduce harvesting of immature and lead to improvement of future landings and sustainability of the fishery.   Key words: Bait, condition factor, gear, Gonadosomatic index, fishing index, immature.
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