首页> 外文期刊>Open Journal of Marine Science >Growth, Mortality Parameters and Exploitation Rate of West African Ilisha (Ilisha africana Bloch, 1795, Clupeidae) off Benin Coastal Waters (West Africa): Implications for Management and Conservation
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Growth, Mortality Parameters and Exploitation Rate of West African Ilisha (Ilisha africana Bloch, 1795, Clupeidae) off Benin Coastal Waters (West Africa): Implications for Management and Conservation

机译:贝宁沿海水域(西非)以外的西非伊利沙(Ilisha africana Bloch,1795年,克鲁贝科)的生长,死亡率参数和开发率:对管理和保护的意义

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West African Ilisha was the third most abundant species of Clupeidae off Benin coastal waters after Sardinella spp and Ethmalosa frimbriata. The fishing effort of these fisheries increased with a dominance of small-sized specimens in the catches. This paper allowed updating some demographic parameters and the exploitation rate of Ilisha africana collected between July 2013 and June 2014 from the coastal waters of Benin for management and conservation of these fisheries. The growth pattern showed a negative allometric growth with an abundance of small-sized specimens. The von Bertalanffy growth function (VBGF) estimations were: L∞= 21.31 cm standard length; K = 1.20 year-1; and t0 = -0.138 year. The total mortality rate (Z), natural mortality rate (M) and fishing mortality rate (F) were 4.040 year-1, 2.27 year-1 and 1.77 year-1 respectively. The Z/K ratio was 3.667 and the exploitation rate (E = F/Z) was 0.44 showing an under exploitation of this species. The estimated potential longevity (tmax) was 2.5 years. In addition, the fisheries management should be devolved from the state to the local level to compel fishermen to take greater responsibility for the sustainability and conservation of the fisheries such as size-limit regulation by gradually increasing fishing gears mesh size.
机译:西非的以利沙(Ilisha)是贝宁近海第三大丰富的科科,仅次于沙丁鱼和Ethmalosa frimbriata。这些渔场的捕捞努力增加了,因为渔获物中的小型标本占主导地位。本文允许更新2013年7月至2014年6月期间从贝宁沿海水域收集的用于管理和养护这些渔业的非洲人口统计参数和伊利莎非洲的开发率。生长模式显示出负的异速生长,其中包含大量的小型标本。 von Bertalanffy生长函数(VBGF)的估计值为:L∞= 21.31 cm标准长度; K = 1.20年-1;并且t0 = -0.138年。总死亡率(Z),自然死亡率(M)和捕捞死亡率(F)分别为1年4.040年,2.27年1年和1.77年1年。 Z / K比为3.667,开发利用率(E = F / Z)为0.44,表明该物种的开发不足。估计的潜在寿命(tmax)为2.5年。此外,渔业管理应从州下放到地方,以迫使渔民对渔业的可持续性和养护承担更大的责任,例如通过逐步增加渔具的网眼尺寸来限制规模。

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