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首页> 外文期刊>North American Journal of Fisheries Management >Effects of Angler Harvest on Adult Muskellunge Growth and Survival in Escanaba Lake, Wisconsin, 1956-2016
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Effects of Angler Harvest on Adult Muskellunge Growth and Survival in Escanaba Lake, Wisconsin, 1956-2016

机译：Angler收获对Escanaba Lake，Wisconsin，1956-2016的成人Muskellunge成长和生存的影响

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The behavior of anglers targeting Muskellunge Esox masquinongy in Wisconsin has changed over time from being harvest oriented to catch-and-release oriented. Our objectives were to use the long-term tagging data set (1956-2016) available on the Muskellunge population of Escanaba Lake, Wisconsin, to characterize sex-specific age structure, length at age, and survival in relation to a potential change in angler harvest. We hypothesized that (1) angler harvest has changed over time, (2) age structure and length at age have changed in relation to the change in angler harvest, and (3) annual survival has changed over time in relation to changes in angler harvest. A breakpoint analysis revealed distinct changes in angler total harvest over time, occurring in 1995 and 2011. Muskellunge harvest (1956-1994) was significantly higher (29.7 +/- 15.9 fish/year [mean +/- SD]) than that observed during 1995-2010 (6.5 +/- 2.9 fish/year) and 2011-2016 (0.83 +/- 1.1 fish/year). Sex-specific growth did not differ between fishery type (i.e., high and low harvest). However, there was evidence that the asymptotic length of female Muskellunge was higher during the high harvest fishery. The top model in program MARK suggested that survival (S) differed by fishery type; i.e., S-high +/- SD = 0.72 +/- 0.01 and S-low +/- SD = 0.99 +/- 0.006. Exploitation was the primary component of annual mortality. Natural and discard mortality could not be differentiated. Natural and discard mortality was 9.2 +/- 11%/year during the high harvest fishery and 4.9 +/- 5.9%/year during the low harvest fishery. Reductions in Muskellunge exploitation led to increased survival and no apparent change in length at age. These results from Escanaba Lake suggest that the lack of harvest leading to an unexploited Muskellunge fishery may result in population stability, improved age structure distribution, and adult survival, but could potentially hinder management actions meant to further increase population density or growth potential to trophy size.
机译：在威斯康星州的钓鱼者瞄准Muskelnge Esox Masquinongy的钓鱼者的行为随着时间的推移而变化，从被导向到捕获和释放导向。我们的目标是在威斯康星州埃斯卡纳湖的穆斯凯克人口上使用长期标记数据集（1956-2016），以表征性别特异性年龄结构，年龄的长度，以及与钓鱼者潜在变化的生存收成。我们假设（1）钓鱼者收获随着时间的推移而变化，（2）年龄的年龄结构和长度与钓鱼者收获的变化发生了变化，（3）年生存随着时间的变化而改变了与钓鱼者收获的变化发生了变化。断点分析显示钓鱼者全部收获的不同变化，1995年和2011年发生。Muskellunge收获（1956-1994）显着高（29.7 +/- 15.9鱼/年[平均+/- SD]）比观察到的1995-2010（6.5 +/- 2.9鱼/年）和2011-2016（0.83 +/- 1.1鱼/年）。渔业类型（即，高收获）之间的性别特异性增长没有差异。然而，有证据表明，在高收获渔业期间，雌性麝香的渐近长度更高。程序标记中的顶级模型表明，渔业类型的生存不同;即，S-HIGH +/- SD = 0.72 +/- 0.01和S-LOW +/- SD = 0.99 +/- 0.006。剥削是年死亡率的主要成分。天然和丢弃的死亡率无法区分。自然和丢弃的死亡率为9.2 +/- 11％/年度，在高收获渔业期间和4.9 +/- 5.9％/年内的低收获渔业。减少麝香肠剥削导致生存增加，并且年龄的长度没有明显的变化。亚太斯巴巴湖的结果表明，缺乏导致未开发的Muskellunge渔业的收获可能导致人口稳定，改善年龄结构分布和成人生存，但可能妨碍管理行动意味着进一步增加人口密度或增长潜力的奖杯规模。

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