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首页> 外文期刊>North American Journal of Fisheries Management >Demographics of Shovelnose Sturgeon in the Lower Wabash River, Illinois
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Demographics of Shovelnose Sturgeon in the Lower Wabash River, Illinois

机译：伊利诺伊州下瓦巴什河上的Sho鹿vel的人口统计

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摘要

With the closure of commercial fishing for Shovelnose Sturgeon Scaphirhynchus platorynchus in most reaches of the Mississippi and Missouri rivers, harvest may increase in other rivers. We studied the demographics of a commercially exploited Shovelnose Sturgeon population in the lower 322 km of the Wabash River, Illinois. During 2000-2013, 10,734 Shovelnose Sturgeon were captured by using DC and AC electrofishing, gill nets, hoop nets, trotlines, and benthic trawls. Of the captured individuals, 399 fish were recaptured. Electrofishing CPUE was the highest reported in any study on Shovelnose Sturgeon. Captured fish ranged between 61 and 909 mm FL (mean = 662 mm; median = 671 mm), but few fish were smaller than 500 mm. Although the fish were in good condition (mean relative weight = 89.9), there was a decreasing trend in mean condition over time. Shovelnose Sturgeon ranged in age from 0 to 25 years; 90% of the fish were between age 8 and age 19. Fish were fully recruited to the sampling gear at age 10; total annual mortality for fish older than 10 years was 20.6%. An empirical growth rate of 2.67 mm/year was observed for fish larger than 635 mm, with several individuals showing negative growth. The sex ratio was slightly skewed toward males (2.18 males : 1 female). The Shovelnose Sturgeon population in the lower Wabash River was generally healthy and stable and had characteristics comparable to those of the upper Wabash River population, with slow growth, large sizes, good condition, and low mortality.
机译：随着密西西比河和密苏里州大部分河段的Sho鱼St鱼Scaphirhynchus platorynchus的商业捕鱼业的关闭，其他河流的收成可能增加。我们研究了伊利诺伊州瓦巴什河下游322公里处被商业开采的Shovelnose urge鱼种群的人口统计信息。在2000-2013年期间，使用直流电和交流电鱼，刺网，箍网，小跑和底栖拖网捕获了10,734只Sho鱼。在捕获的个体中，有399条鱼被重新捕获。在任何一种对小锥鼻St的研究中，电钓CPUE的报告数量最高。捕获的鱼的FL范围为61至909毫米（平均= 662毫米;中位数= 671毫米），但很少有小于500毫米的鱼。尽管鱼的状况良好（平均相对重量= 89.9），但平均状况却随时间而下降。 Shovelnose urge鱼的年龄为0到25岁。 90％的鱼年龄在8岁至19岁之间。鱼在10岁时完全被捕捞到了采样装置中;到10岁时，它们已经完全被捕捞。 10岁以上鱼类的年总死亡率为20.6％。对于大于635毫米的鱼，观察到的经验增长率为2.67毫米/年，一些个体显示出负增长。性别比略偏向男性（男性2.18：女性1：1）。瓦巴什河下游的长尾Sho鱼种群总体健康，稳定，并具有与瓦巴什河上游种群相当的特征，生长缓慢，规模大，状况良好，死亡率低。

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