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首页> 外文期刊>ICES Journal of Marine Science >Total stock size and cannibalism regulate recruitment in cod (Gadus morhua) on the Faroe Plateau
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Total stock size and cannibalism regulate recruitment in cod (Gadus morhua) on the Faroe Plateau

机译：总种群规模和食人行为调节法罗高原鳕鱼（Gadus morhua）的募集

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摘要

Year-class strength of fish is often considered to be determined at the pelagic larval stage, but we show that year-class strength of cod on the Faroe Plateau seems to be determined later, at the 1- or 2-group stage. Adult cod (C), measured in terms of the catch per unit effort (cpue) of small longliners, move into nearshore nursery areas of juvenile cod when in poor condition and probably displace 1-year-old cod to deeper water, where they are cannibalized. In addition, the recruitment of 2-year-old cod, at least up to a certain level, is positively related to the total biomass (B) of older cod on the Faroe Plateau, which are present at about the same time as the recruitment event. This feature, which seems to be a new observation in terms of the recruitment dynamics of cod, is possibly related to enhanced foraging or a reduced predation risk. The recruitment of 2-year-old cod during the years 1984-2006 is described by aB/C + d (r~2 = 0.87), where a and d are fitted constants. The implications for stock assessment and management are discussed.
机译：鱼的年级强度通常被认为是在上层幼体阶段确定的，但我们表明，法罗高原上的鳕鱼年级强度似乎是在稍后的1组或2组阶段确定的。成年鳕鱼（C），以小型延绳钓渔船的单位捕捞量（cpue）来衡量，在状况不佳时会移至少年鳕鱼的近岸育苗区，并可能将一岁的鳕鱼移至较深的水域，在那里食人此外，募集至少要达到一定水平的2岁鳕鱼与法罗高原上较老鳕鱼的总生物量（B）呈正相关，它们与募集大约同时存在事件。就鳕鱼的募集动态而言，这一特征似乎是一个新的发现，可能与觅食的增加或捕食风险的降低有关。 aB / C + d（r〜2 = 0.87）描述了1984-2006年2岁鳕鱼的募集，其中a和d为拟合常数。讨论了对库存评估和管理的影响。

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