Clements Owen N, Leurs Guido, Witbaard Rob, Pen Ido, Verkuil Yvonne I, Govers Laura L
Groningen Institute for Evolutionary Life Sciences (GELIFES), Conservation Ecology Group, University of Groningen, Groningen, The Netherlands.
Department of Coastal Systems, Royal Netherlands Institute for Sea Research (NIOZ), Texel, The Netherlands.
PeerJ. 2022 Mar 7;10:e12894. doi: 10.7717/peerj.12894. eCollection 2022.
The pearl whipray (Compagno & Roberts, 1984) is a common elasmobranch in coastal western African waters. However, knowledge on their life-history and trophic ecology remains limited. Therefore, we aimed to determine the growth, maturity and diet of from the Bijagós Archipelago in Guinea-Bissau. Growth was modelled with: von Bertalanffy, Gompertz and logistic functions. Model selection revealed no model significantly outperformed another. The sampled age ranged from less than 1 to 7 years (1.8 ± 1.9 cm, mean ± standard deviation) and size (disc width) ranged from 12.2 to 30.6 cm (18.7 ± 5.2 cm). Size-at-maturity was estimated at 20.3 cm (95% CI [18.8-21.8 cm]) for males and 24.3 cm for females (95% CI [21.9-26.5 cm]), corresponding ages of 2.2 and 3.9 years. The diet differed significantly among young-of-the-year (YOY), juveniles and adults ( = 0.001). Diet of all life stages consisted mainly of crustaceans (27.4%, 28.5%, 33.3%) and polychaetes (12.5%, 26.7%, 20.3%), for YOY, juveniles and adults respectively. This study shows that is relatively fast-growing, matures early and experiences ontogenetic diet shifts. These results contribute to status assessments and conservation efforts of and closely related species.
珍珠黄貂鱼（Compagno & Roberts，1984年）是西非沿海水域常见的一种板鳃亚纲鱼类。然而，关于它们的生活史和营养生态学的知识仍然有限。因此，我们旨在确定来自几内亚比绍比热戈斯群岛的珍珠黄貂鱼的生长、成熟度和饮食情况。生长情况采用冯·贝塔朗菲、冈珀茨和逻辑斯蒂函数进行建模。模型选择显示没有一个模型明显优于其他模型。采样的年龄范围从不到1岁到7岁（1.8±1.9厘米，平均值±标准差），大小（盘宽）范围从12.2厘米到30.6厘米（18.7±5.2厘米）。雄性的成熟体长估计为20.3厘米（95%置信区间[18.8 - 21.8厘米]），雌性为24.3厘米（95%置信区间[21.9 - 26.5厘米]），相应年龄为2.2岁和3.9岁。当年幼鱼（YOY）、幼鱼和成鱼的饮食存在显著差异（=0.001）。所有生活阶段的饮食主要由甲壳类动物组成（分别为27.4%、28.5%、33.3%）和多毛类动物（分别为12.5%、26.7%、20.3%），分别对应当年幼鱼、幼鱼和成鱼。这项研究表明珍珠黄貂鱼生长相对较快，成熟较早，并经历个体发育饮食转变。这些结果有助于对珍珠黄貂鱼及密切相关物种的现状评估和保护工作。
