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首页> 外文期刊>North American Journal of Fisheries Management >Estimating Exploitation and Modeling the Effects of Hand Fishing on a Flathead Catfish Population in East Texas
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Estimating Exploitation and Modeling the Effects of Hand Fishing on a Flathead Catfish Population in East Texas

机译：估算施工捕捞对东德克萨斯州扁平鲶人口的剥削和建模

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摘要

The recent legalization of hand fishing in Texas has prompted concern for the potential overharvest of catfish. Large (>= 600 mm) Flathead Catfish Pylodictis olivaris are thought to be vulnerable to this angling method, and the potential effects of selectively harvesting large fish are not well understood. Therefore, in April 2013 we quantified size-and gear-specific exploitation of Flathead Catfish in Lake Palestine, Texas, by tagging 255 fish within three size-groups (457-599, 600-761, and >= 762 mm) with reward tags. We also quantified abundance, mortality (total and natural), and growth to simulate the effects of exploitation (particularly of size-groups targeted by hand fishing) on the Flathead Catfish population. Exploitation was low (3.2%), and size-specific harvest was less than 5% for all size-groups. Trotlines and hand fishing accounted for 100% of observed harvest (50% for each gear). Our models indicated that maximum sustainable yield would be achieved at 10% to 15% exploitation. Recruitment overfishing and growth overfishing were evident at about 15% to 20% exploitation. When we simulated increased exploitation by hand fishers only (achieved by only increasing exploitation of fish >= 762 mm), recruitment overfishing was not evident until 55% exploitation, and growth overfishing never occurred. These results indicate that the current low harvest by hand fishers will have little impact on yield or size structure of Flathead Catfish, and, in most scenarios, the current 457-mm minimum length limit can maintain a sustainable fishery. Undoubtedly, any additional harvest of trophy fish (>= 762 mm) will reduce trophy fish abundance; however, exploitation of trophy fish (alone) would need to exceed 55% before populations become unsustainable.
机译：德克萨斯州手捕捞的最近合法化促使关注鲶鱼的潜在大量。大型（> = 600 mm）扁平鲶鱼Pylodictis Olivaris被认为容易受到这种钓鱼方法的影响，并且选择性收获大鱼的潜在效果也不太了解。因此，2013年4月，我们通过在三个尺寸组（457-599,600-761和> = 762毫米）内标记255条鱼类，量化了大小和齿轮特异性开发德克萨斯州巴勒斯坦湖（457-599,600-761），奖励标签。我们还量化了丰富，死亡率（总和自然），增长，以模拟剥削（特别是手工捕捞的尺寸组）对蓬蓬鲶鱼群的影响。剥削低（3.2％），所有尺寸组的尺寸特异性收获量小于5％。跑车和手工捕鱼占观察收获的100％（每个齿轮的50％）。我们的模型表明，最大可持续收益率将以10％至15％的剥削实现。招聘过度捕捞和增长过度捕捞的剥削率约为15％至20％。当我们仅模拟手工渔民的剥削时（仅通过越来越多的鱼类> = 762毫米而实现），直到55％的剥削，并且从未发生的增长过度捕捞，招生过度捕捞并不明显。这些结果表明，手工渔民的当前低收获对扁毛鲶的产量或尺寸结构几乎没有影响，并且在大多数情况下，目前的457毫米最小长度限制可以维持可持续的渔业。毫无疑问，奖杯鱼（> = 762毫米）的任何额外收获都会减少奖杯的丰富;然而，在人群变得不可持续的情况下，对奖杯鱼（单独）的开采需要超过55％。

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