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首页> 外文期刊>North American Journal of Fisheries Management >Optimal stocking densities of walleye fingerlings in Minnesota lakes.
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Optimal stocking densities of walleye fingerlings in Minnesota lakes.

机译：明尼苏达州湖泊中角膜白鲑的最佳放养密度。

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摘要

A generalized additive model was developed that described the effects of fingerling stocking density on the abundance of walleyes Sander vitreus in 551 lakes in Minnesota. Walleye abundance was measured as a catch per effort (CPE) from 1,511 standard Minnesota Department of Natural Resources gill-net assessments conducted during 1986-2004. In addition to fingerling stocking, the effects of lake morphometry, productivity, and fish community variables on walleye CPE were also described using a generalized additive model. Lake morphometry variables had sharply nonlinear effects on walleye abundance. Walleye abundance declined in lakes with areas less than 1,000 acres and increased rapidly in lake-, with depths of less than 30 ft. The lake productivity variable, total alkalinity, was positively related to walleye abundance. Abundance of northern pike Esox lucius had a negative effect and abundance of yellow perch Perca flavescens a positive effect on walleye abundance. The response of walleye abundance to fingerling stocking was asymptotic: peak walleye abundance occurred at stocking densities greater than 0.65 lb-littoral acre-1-year-1. A fingerling stocking density of 0.50 lb-littoral acre-1[center dot]year-1 is recommended as a balance between increased abundance and relative costs of stocking for most lakes in Minnesota.
机译：建立了通用的加性模型，该模型描述了鱼种放养密度对明尼苏达州551个湖泊中的角膜白斑玻璃体的丰度的影响。 1986年至2004年，根据明尼苏达州自然资源部g网评估的1,511条标准，以每抓捕捞量（CPE）来衡量角膜白斑的丰度。除鱼种放养外，还使用广义加性模型描述了湖泊形态，生产力和鱼类群落变量对角膜白斑病菌的影响。湖的形态变量对角膜白斑的丰度具有明显的非线性影响。面积小于1,000英亩的湖泊中的角膜丰度下降，而深度小于30英尺的湖泊中的壁角丰度迅速增加。湖泊生产力变量即总碱度与角膜丰度成正相关。北部派克（Esox lucius）的丰度对角膜白眼的丰度有负面影响，而黄鲈（Perca flavescens）的丰度则具有正面影响。角膜白斑丰度对鱼种放养的反应是渐进性的：在密度大于0.65磅的滨英亩1年1的放养密度下，出现了最大的壁眼白斑。建议在明尼苏达州的大多数湖泊中，将鱼种的放养密度设为0.50磅/英亩-1 [中心点]年-1，以平衡增加的放养量和相对放养成本。

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