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首页> 外文期刊>North American Journal of Fisheries Management >Field Evaluation and Simulation Modeling of Length Limits and their Effects on Fishery Quality for Muskellunge in the New River, Virginia
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Field Evaluation and Simulation Modeling of Length Limits and their Effects on Fishery Quality for Muskellunge in the New River, Virginia

机译：弗吉尼亚州新河渔业品质对长度限制及其对渔业品质的影响

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摘要

The trophy fisheries for Muskellunge Esox masquinongy in the northern U.S.A. and Canada often are developed and maintained by using high minimum-length limits (MLLs). However, the effectiveness of using such MLLs on southern-latitude Muskellunge populations, which have different rates of growth and mortality, warrants further research. The Muskellunge fishery in the New River, Virginia, was managed under a 30-in (75 cm) MLL until 2006 when the MLL was increased to 42 in (105 cm) to increase the abundance of large Muskellunge. We measured fishery quality before and after the institution of the 42-in MLL using size structure, average individual condition, rates of growth and mortality, and CPUE. We also assessed the potential of alternative length regulations (other MLLs and a 40-48-in protected-slot limit) to improve the population's size structure and trophy production using simulation models in the Fisheries Analyses and Modeling Simulator (FAMS) program. Following the institution of the 42-in MLL, we observed a 5-in increase in the average size of Muskellunge, an increase in the population's size structure with greater proportions of memorable-size individuals (&= 42 in) and an increase in the abundance of memorable-size Muskellunge. However, declines in the average condition, i.e., relative weight (W-r), of large Muskellunge (&= 38 in) suggest there is possible stockpiling of individuals just below the 42-in length limit. Higher MLLs (e.g., 48-in MLL) could further improve fishery quality by increasing the survival of Muskellunge to large trophy sizes (&= 50 in). However, managers should be wary of stockpiling under alternative MLLs as well. Furthermore, a higher MLL is unlikely to garner broad angler support in this system. Conversely, a protected-slot limit that allows the production of some trophy-sized Muskellunge while reducing the overall number of individuals, and that limits potential for stockpiling, may be a more agreeable regulatory option for New River fishery managers. These findings and the methods described within this study may be useful for fisheries managers working on other Muskellunge fisheries in southern systems.
机译：Muskellunge Esox Masquinongy在美国北部的奖杯渔业渔业渔业经常通过使用高最小长度限制（MLL）来开发和维护和维护。然而，在南纬麝香植物中使用这种MLL的有效性，这具有不同的增长和死亡率，认证进一步研究。弗吉尼亚州新河的Muskellunge渔业在30 in我们使用尺寸结构，平均个体条件，增长率和死亡率，以及CPE，我们在42英寸MLL的机构前后测量了渔业质量。我们还评估了替代长度法规（其他MLL和40-48-抗保护式槽极限）的潜力，以改善渔业分析和建模模拟器（FAMS）计划中的仿真模型的频率尺寸结构和奖杯生产。在42-in MLL的机构之后，我们观察到麝香麝香的平均规模增加了5-升级，人口规模结构的增加，比例更大的令人难忘的个体（＆amp; = 42 in）和一个增加令人难忘的穆斯克鲁克的丰富。然而，大麝香（＆amp; = 38英寸）的平均条件下降，即相对重量（W-R）表明，在42平方长度下方可能会有储存的个体。通过将Muskellunge的生存增加到大型奖杯大小（＆amp; = 50英寸），更高的MLL（例如，48英寸MLL）可以进一步提高渔业质量。但是，管理人员应该在替代的MLL下对储存的警惕。此外，更高的MLL不太可能在该系统中加入广泛的垂钓者。相反，允许生产一些奖杯大小的Muskellunge的受保护槽极限，同时减少个人的总数，并限制储存的潜力，可能是新的河流渔业管理者更加令人愉快的监管选择。这些研究结果和本研究中描述的方法可能对南部系统其他Muskellunge渔业工作的渔业经理有用。

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