Monthly variability of hydroacoustic fish stock estimates in a deep lake and its correlation to gillnet catches
Monthly variability of hydroacoustic fish stock estimates in a deep lake and its correlation to gillnet catches
复制标题
深湖水声鱼类种群估计的每月变化及其与刺网渔获量的相关性
DOI：
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复制
发表时间：
2002
期刊：
影响因子：
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通讯作者：
M. Schulz
中科院分区：
文献类型：
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作者：
T. Mehner;M. Schulz
Monthly (April to November) hydroacoustic surveys and parallel gillnet catches were used to determine vendace Coregonus albula abundance, biomass and population dynamics in a deep oligotrophic lake. By hydroacoustic surveys, recruitment of 0+ year vendace could clearly be detected. In contrast, gillnet catches resulted in low numbers of 0+ year fish, and similarly under-represented proportions of the oldest vendace. Consequently, the correlation between hydroacoustics and gillnets with respect to fish numbers and geometric mean fish total length was high only for the age groups 1 + to 4+ years. Annual variability in hydroacoustic estimates offish abundance and biomass was high (CV=26–29%) which reflects the seasonal population dynamics of vendace.
