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首页> 外文期刊>North American Journal of Fisheries Management >Seasonal Changes in Condition of Appalachian Brook Trout
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Seasonal Changes in Condition of Appalachian Brook Trout

机译：Appalachian Brook Trout条件的季节变化

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Reliable fish condition estimates help managers better understand ecosystem population dynamics. Therefore, our study objectives were to measure seasonal changes in percent dry weight and energy density (physiological-based measures of condition) of stream-dwelling Appalachian Brook Trout Salvelinus fontinalis, field-validate bioelectrical impedance analysis (BIA) models, and compare reliability of BIA and morphometric-based estimates of condition. Percent dry weight was highly correlated to energy density (R-2 = 0.93; J/g wet weight = -1,803.5 + 286.43 . [percent dry weight]), and the relationship was clearly different from those published previously for other salmonids. Significant seasonal changes in adult Brook Trout condition were observed and likely related to energy depletion from reproduction and changes in terrestrial invertebrate consumption. Adult percent dry weight peaked in early September and was lowest in February. Age-0 fish did not have large changes in measured condition between summer and winter. Bioelectrical impedance analysis was able to estimate adult mean monthly percent dry weight reliably; however, it did not appear to outperform results from relative weight (W-r). Neither W-r nor predicted percent dry weight from BIA was a reliable estimator of condition for individual adult fish. The BIA model for age-0 fish was unable to provide reliable predictions for either individual fish or monthly mean estimates, due in large part to the small range in measured condition. The BIA estimated monthly mean energy density more reliably than did W-r. Overall results of this study indicate that BIA did not performappreciably better than W-r, which requiredmuch less effort to collect. Potential BIA model improvements may be possible by accounting for changes in skin temperature. Until improvements in the Brook Trout BIA models occur, their use should be limited to estimating mean energy density.
机译：可靠的鱼类状况估计有助于管理者更好地了解生态系统人口动态。因此，我们的研究目标是测量干重和能量密度的季节性变化（基于生理学的条件措施）溪流停留的Appalachian Brook Trout Salvelinus Fontinalis，现场验证的生物电阻抗分析（BIA）模型，并比较可靠性BIA和Morphometric的条件估计。干重的百分比与能量密度高（R-2 = 0.93; J / G湿重= -1,803.5 + 286.43）。[百分比干重]），并且这种关系与此前用于其它鲑鱼的那些。观察到成人溪鳟状况的显着季节性变化和可能与从繁殖和陆地无脊椎动物消费的变化的能量消耗有关。 9月初的成人干重的百分比达到顶峰，2月份最低。夏季和冬季之间的测量条件下没有巨大的变化。生物电阻抗分析能够可靠地估计成年人的平均百分比干重;但是，它没有似乎优于相对重量（W-R）的结果。 W-R和预计BIA的干重没有预测的百分比是个体成人鱼的可靠估计。 Ads-0 Fish的BIA模型无法为单独的鱼类或每月平均值提供可靠的预测，这在很大程度上由于测量条件下的小范围。 BIA估计每月平均能量密度比W-R更可靠。这项研究的总体结果表明，BIA没有比W-R表现得更好，这需要少努力收集。通过算用于皮肤温度的变化，可能可以进行潜在的BIA模型改进。直到发生粗鲁鳟鱼BIA模型的改进，它们的使用应限于估计平均能量密度。

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