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Raised‐Footrope Gill‐Net Modification Significantly Reduces Subadult Atlantic Sturgeon Bycatch
North American Journal of Fisheries Management ( IF 1.1 ) Pub Date : 2020-04-10 , DOI: 10.1002/nafm.10447
Christian Hager 1 , Juan C. Levesque 2 , R. Jason Dickey 3 , Jason E. Kahn 4
Affiliation  

Bycatch is a major problem in most commercial fisheries around the world and is among the greatest challenges for fisheries managers tasked with conserving, protecting, and sustaining marine resources. Bycatch of protected species is particularly problematic because even small levels of bycatch mortality can hinder conservation efforts. The federally protected Atlantic Sturgeon Acipenser oxyrinchus oxyrinchus is one such example. Unknown numbers of Atlantic Sturgeon are caught as bycatch in commercial gill‐net fisheries along the U.S. Atlantic coast, with discard mortality rates as high as 51%. The Striped Bass Morone saxatilis sink gill‐net fishery in the James River, a tributary to Chesapeake Bay, is the only inshore fishery in Virginia with mesh sizes (13.3–20.3‐cm stretched mesh) that are large enough to have high levels of Atlantic Sturgeon bycatch. This study was conducted during the spring fishery and examined a modified gill‐net design that incorporated a raised footrope at the bottom of the net, creating an approximately 1‐m space between the benthos and the net. The modified net was fished alongside conventional commercial gear to evaluate catch rates of Striped Bass and Atlantic Sturgeon in each gear. Our findings showed that the experimental net significantly reduced bycatch of Atlantic Sturgeon (64.3%) and significantly increased the landings of Striped Bass (45.6%). This gear should be considered as a management option for the spring Striped Bass fishery in Virginia and any fishery in which subadult Atlantic Sturgeon are the primary bycatch. Additional research on seasonal orientation of Atlantic Sturgeon in the water column is needed before adopting the raised‐footrope design in the presence of adults on spawning runs.

中文翻译:

高架F网改造明显减少了亚成体大西洋Atlantic鱼的兼捕

兼捕是世界上大多数商业渔业中的一个主要问题,对于负责保护,保护和维持海洋资源的渔业管理者来说,这也是最大的挑战之一。受保护物种的兼捕尤其成问题,因为即使很小的兼捕死亡率也会阻碍保护工作。受联邦政府保护的大西洋Stoxyrinchus oxyrinchus就是这样的一个例子。在美国大西洋沿岸的商业g网捕鱼中,有数量不明的大西洋St鱼被捕为副产品,丢弃的死亡率高达51%。条纹鲈鱼Morone saxatilis詹姆斯河(切萨皮克湾的支流)的沉没式刺网渔业是弗吉尼亚州唯一的网眼尺寸(拉网为13.3-20.3厘米)的近海渔业,其大小足以容纳高水平的大西洋St鱼副渔获物。这项研究是在春季捕捞期间进行的,研究了一种改进的刺网设计,该设计在网的底部结合了凸起的脚步,在底栖动物和网之间形成了大约1 m的空间。将改良的网与常规的商用渔具一同捕鱼,以评估每种渔具中的鲈鱼和大西洋St鱼的捕获率。我们的发现表明,实验网明显减少了大西洋St鱼的副渔获物(64.3%),并显着增加了条纹鲈鱼的着陆(45.6%)。对于弗吉尼亚州的春季条纹鲈渔业和以亚成年大西洋St鱼为主要副产品的任何渔业,应考虑将该渔具作为管理选择。在产卵场成年时,在采用隆起人行道设计之前,还需要对大西洋St鱼在水柱中的季节性取向进行更多研究。
更新日期:2020-04-10
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