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Growth, mortality, ovarian maturity, and exploitation of the Guinea shrimp, Holthuispenaeopsis atlantica (Balss, 1914) (Decapoda: Dendrobranchiata: Penaeidae) in inshore waters of Ghana, West Africa
Journal of Crustacean Biology ( IF 1.1 ) Pub Date : 2020-03-28 , DOI: 10.1093/jcbiol/ruaa010
Paulina Okpei 1, 2 , Joseph Aggrey-Fynn 1 , Isaac Okyere 1
Affiliation  

The Guinea shrimp, Holthuispenaeopsis (= Parapenaeopsis) atlantica (Balss, 1914) is exploited by traditional and commercial fisheries in the Gulf of Guinea, West Africa. We assessed growth, mortality, ovarian maturity, and exploitation of the population of the species in inshore waters of Ghana as a contribution of filling the knowledge gap on the species. Samples were obtained from fish landing sites from three different coastal towns in Ghana from October, 2017 to May, 2018. Length-frequency data were used to estimate growth, mortality and exploitation ratio. The modal class for males was 6.0–6.9 cm total length (TL) and 9.0–9.9 cm TL in females. The length and weight relationship established that growth in both sexes was negatively allometric. The estimated growth parameters from the length frequency data fitted with the von Bertalanffy growth function were asymptotic length (L) of 10.08 cm for males and 15.4 cm for females. The growth constant (K) was calculated as 0.99 yr–1 for males and 0.89 yr–1 for females. The mean length-at-first capture (Lc) was found to be lower than the mean length at sexual maturity (Lm). The sex ratio showed a preponderance of females over males throughout the period, with 76.21% females. The total mortality rate (Z) for males was more than for females. The estimated natural mortality was 2.32 yr−1 for males and 1.93 yr−1 for females (M) whiles fishing mortality (F) rate was 1.22 yr−1 for males and 1.46 yr−1 for females. The exploitation ratio showed the stocks were not over-exploited. The estimated population parameters of the species obtained should be significant for the sustainable management of this resource.

中文翻译:

西非加纳近岸水域豚鼠Holthuispenaeopsis atlantica(Balss,1914)(十足目:Dendrobranchiata:Penaeidae)的生长,死亡率,卵巢成熟和开发

几内亚虾,大西洋大虾(Holthuispenaeopsis(= Parapenaeopsis))(Balss,1914年)被西非几内亚湾的传统和商业渔业所利用。我们评估了加纳近岸水域该物种的生长,死亡率,卵巢成熟度以及对该物种的开发,以弥补该物种的知识空白。从2017年10月至2018年5月,从加纳三个不同沿海城镇的鱼类着陆点获取了样本。长度频率数据用于估计生长,死亡率和开发比例。男性的情态类别为女性的总长度(TL)为6.0-6.9 cm,女性的TL为9.0-9.9 cm。身长与体重之间的关系确定了两性的生长都是负向异速生长的。根据符合von Bertalanffy生长函数的长度频率数据估计的生长参数为渐近长度(L的10.08厘米男性和15.4厘米女性)。男性的生长常数(K)计算为0.99年–1,女性为0. 89年–1。发现首次捕获的平均长度(L c)低于性成熟时的平均长度(L m在此期间,性别比显示出女性占多数,男性为76.21%。男性的总死亡率(Z)高于女性。估计的自然死亡率是雄性为2.32年-1,雌性为1 .93年-1M)而鱼类死亡率(F)男性的发病率为1 .22年-1,女性为1. 46年-1。开采比率表明库存没有被过度开采。获得的物种的估计种群参数对于该资源的可持续管理将是重要的。
更新日期:2020-03-28
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