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首页> 外文期刊>ICES Journal of Marine Science >A comparison of cod life-history parameters inside and outside of four year-round groundfish closed areas in New England, USA
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A comparison of cod life-history parameters inside and outside of four year-round groundfish closed areas in New England, USA

机译：美国新英格兰四个整年底层鱼类禁猎区内外鳕鱼生活史参数的比较

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摘要

From 1994 to 2002, five major year-round closed areas were established in the Gulf of Maine and on Georges Bank to promote recovery of groundfish species, including Atlantic cod (Gadus morhua). Here, we present life-history data for cod sampled within and next to four of the five closed areas to test the hypothesis that closed areas benefit cod. We found a positive effect of closure status on cod age, length and growth for three of the four closed areas; contrary results for the fourth area (Jeffreys Ledge) may be due to recreational fishing pressure. Diet results were not consistent across closed areas, but for the two areas farthest from shore (Cashes Ledge and Closed Area II), cod tended to have higher gut fullness and higher trophic niche breadth (based on stable isotopes) inside vs. outside. Body shape analysis revealed a consistent effect of closure status on cod morphometry with cod inside closed areas exhibiting less streamlined bodies. We discuss this apparent selection for more sedentary cod with lower productivity potential but highlight the demographic result (i.e. higher age and greater size inside closed areas) as critical considerations for resource managers that are designing or altering the configuration and/or scale of closed areas to protect and rebuild demersal fish species.
机译：从1994年到2002年，在缅因州海湾和乔治银行建立了五个主要的全年禁区，以促进包括大西洋鳕（Gadus morhua）在内的底栖鱼类物种的恢复。在这里，我们展示了五个封闭区域中的四个区域内和附近的鳕鱼的生活史数据，以检验封闭区域有益于鳕鱼的假设。我们发现四个封闭区域中三个区域的封闭状态对鳕鱼的年龄，长度和生长有积极的影响。第四区域（杰弗里斯·莱奇）的相反结果可能是由于休闲捕鱼压力。在封闭区域内的饮食结果不一致，但是对于距离海岸最远的两个区域（Castle Ledge和封闭区域II），鳕鱼的内脏和外皮趋向于具有较高的肠饱满度和较高的营养位（基于稳定的同位素）。体形分析显示，封闭状态对鳕鱼形态具有一致的影响，封闭区域内的鳕鱼体内流线形较少。我们讨论了这种明显的选择，以选择具有较低生产率潜力的久坐鳕鱼，但强调人口统计结果（即更高的年龄和更大的封闭区域内的面积），这是资源经理在设计或更改封闭区域的配置和/或规模以使其成为重要考虑因素时考虑的保护和重建水下鱼类。

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