Inter-annual variation in the surplus prey production for stocking of Japanese flounder Paralichthys olivaceus
Inter-annual variation in the surplus prey production for stocking of Japanese flounder Paralichthys olivaceus
复制标题
牙鲆放养剩余猎物产量的年际变化
DOI：
10.1016/j.fishres.2016.09.011
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发表时间：
2017
影响因子：
2.4
通讯作者：
Yamashita Y
中科院分区：
文献类型：
--
作者：
Tomiyama T;Kurita Y;Uehara S;Yamashita Y
在野生环境中放养孵化鱼的水平应保持在可获得的以食物为基础的承载能力范围内，以避免与野生同种鱼类争夺食物资源。建立了不同放鱼量（包括不放鱼量和实际放鱼量）和不同放鱼丰度条件下野生同种鱼的生长模拟模型。分析了2003 - 2005年福岛鲽幼鱼（约70-110 mm TL）放养情况。我们监测了放生后养殖和野生幼鱼及其猎物（蝇蛆）的丰度变化。我们的调查和模型模拟表明，剩余的猎物产量足以支持库存和野生日本比目鱼的消费（2003年和2004年每个站点高达150,000条），在此期间，野生幼鱼达到了几乎最高的生长速度。然而，在2005年，在一个优势年班的野生日本比目鱼，野生幼鱼的体型比根据最大生长率预测的体型小49%。这表明当年的粮食承载能力已经达到。因此，每年评估现有猎物和野生幼鱼的水平并相应地调整放生是很重要的。
Stocking hatchery fish into the wild should only be implemented at a level that can be sustained within the available food-based carrying capacity to avoid food resource competition with wild conspecifics. We constructed a simulation model to assess the growth of wild conspecifics under different magnitudes of hatchery fish releases, including no releases and actual release levels, and under different wild fish abundancies. Stocking of juvenile Japanese flounderParalichthys olivaceus(approximately 70–110 mm TL) in Fukushima from 2003 to 2005 was analyzed. We monitored post-release changes in abundance of both cultured and wild juveniles and their prey (mysids). Our survey and modelled simulations revealed that the surplus prey production was sufficient to support the consumption of stocked and wild Japanese flounder (up to 150,000 individuals per site in 2003 and 2004), during which wild juveniles achieved nearly maximum growth rates. However, in 2005, during which a dominant year class of wild Japanese flounder occurred, the body size of wild juveniles was 49% smaller than the predicted size based on the maximum growth rates. This suggests that the food-based carrying capacity was reached in that year. Thus, it is important to evaluate the existing prey and wild juveniles levels and adjust the release accordingly every year.
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