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标题：Using an experimental manipulation to determine the effectiveness of a stock enhancement program
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作者：David R. Stewart ; James M. Long
期刊名称：Journal of Freshwater Ecology
印刷版ISSN：0270-5060
电子版ISSN：2156-6941
出版年度：2016
卷号：31
期号：1
页码：37-52
DOI：10.1080/02705060.2015.1021715
出版社：Taylor & Francis
摘要：Abstract We used an experimental manipulation to determine the impact of stocking 178 mm channel catfish Ictalurus punctatus in six impoundments. The study design consisted of equal numbers (two) of control, ceased-stock, and stocked treatments that were sampled one year before and two years after stocking. Relative abundance, growth, size structure, and average weight significantly changed over time based on samples collected with hoop nets. Catch rates decreased at both ceased-stock lakes and increased for one stocked lake, while growth rates changed for at least one ceased-stock and stocked lake. The average weight of channel catfish in the ceased-stock treatment increased by 6% and 25%, whereas weight decreased by 28% and 78% in both stocked lakes. The variability in observed responses between lakes in both ceased-stock and stocked treatments indicates that a one-size-fits-all stocking agenda is impractical, suggesting lake specific and density-dependent mechanisms affect channel catfish population dynamics.
关键词：fish stocking ; stock enhancement ; likelihood estimation ; cessation of stocking ; growth rates ; Ictalurus punctatus