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首页> 外文期刊>North American Journal of Fisheries Management >Effectiveness of a high-frequency-sound fish diversion system at the Annapolis Tidal Hydroelectric Generating Station, Nova Scotia
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Effectiveness of a high-frequency-sound fish diversion system at the Annapolis Tidal Hydroelectric Generating Station, Nova Scotia

机译：新斯科舍省安纳波利斯潮汐水力发电站高频声音鱼引水系统的有效性

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摘要

We describe an experiment to assess the effectiveness of a fish diversion system that utilizes high-frequency sound at the Annapolis Tidal Generating Station, No a Scotia. Canada. during the fall of 1999. A band-limited, random-noise signal, with most of the energy focused between 122 and 128 kHz, was projected into the turbine forebay during randomly selected generating cycles. The effectiveness of the diversion system was assessed by monitoring fish passage through the turbine and two adjacent fishways. During, the study, fish representing 27 taxa were captured. For the 11 species with sufficient data, we modeled the rate of passage as a function of the sampling site and the on/off status of the diversion system and compared models with and without a set of environmental variables. The environmental component of the model was highly significant for all 11 species. When the environmental variables were removed from the models, the standard errors of the diversion coefficients increased, and between-site comparisons showed that factors other than the on/off status of the diversion system were affecting the effectiveness estimates. Model coefficients were estimated using maximum likelihood, assuming Poisson or extra-Poisson error distributions. The catches of all 11 species were overdispersed, and the statistical significance of the effectiveness estimates was overestimated when a Poisson error distribution was assumed. We conclude that the diversion system reduced passage through the turbines for members of the genus Alosa but that it was not effective for the other eight specics. With the diversion system activated, the rates of passage of American had A. sapidissima and alewife A. pseudoharengus through the turbine tube decreased by 42% and 48%, respectively. For blueback herring A. aestivalis, no diversion effect was detected when all catches were included in the analysis However, a 49% decrease in the rate of passage was detected alter the tidal cycles when the three largest catches were trimmed from the data.
机译：我们描述了一个实验，以评估鱼类引流系统的有效性，该系统利用了无斯科舍省安纳波利斯潮汐发电站的高频声音。加拿大。在1999年秋季，在随机选择的发电周期中，一个带限的随机噪声信号被投射到涡轮机前湾，其大部分能量集中在122至128 kHz之间。转移系统的有效性通过监测鱼通过涡轮机和两条相邻鱼道的途径进行评估。在研究期间，捕获了代表27个分类单元的鱼。对于具有足够数据的11个物种，我们对采样率和采样系统的功能状态进行了建模，并比较了有无环境变量的模型。该模型的环境成分对于所有11个物种都非常重要。当从模型中删除环境变量时，转移系数的标准误差增加，站点间比较表明，除转移系统的开/关状态以外的其他因素都在影响有效性估计。假设泊松或泊松误差分布，使用最大似然估计模型系数。当假设有Poisson误差分布时，所有11个物种的渔获量都过度分散，有效性估计的统计意义被高估了。我们得出的结论是，分流系统减少了Alosa属成员通过涡轮的通道，但对其他八种物种却无效。激活分流系统后，美人鱼通过涡轮机管的水曲霉和拟南芥的通过率分别降低了42％和48％。对于蓝纹鲱鱼A.estivalis，当所有渔获物都包括在分析中时，未检测到转移作用。但是，从数据中修剪出三个最大渔获物后，潮汐周期变化，通行率下降了49％。

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