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Individual spawning performance and mating pair combinations in captive grouper aggregations
Environmental Biology of Fishes ( IF 1.4 ) Pub Date : 2022-02-24 , DOI: 10.1007/s10641-022-01232-w
Junichi Okuyama 1 , Tomofumi Yamaguchi 2
Affiliation  

Spawning aggregations have been widely observed in fish. However, individual reproductive performance in aggregations has rarely been measured because of the lack of techniques for individual identification throughout the spawning period. Here, we investigated the individual reproductive performance of four male and 12 female white-streaked groupers (Epinephelus ongus) in simulated spawning aggregations in captivity. Reproductive behaviour was observed by monitoring the simultaneous ascending rush by a pair or group of fish with a fine-scale depth data logger. In this study, we defined verified spawning events as synchronised ascents that met the extraction conditions based on night observations and a complementary experiment. During the experiment, 37 verified spawning events were extracted between four males and ten females; twenty-nine of the verified spawning events involved a single female and a single male, and eight events involved a single female and two males. One presumed and seven false spawning events were also identified. Individuals with higher lipid densities engaged in more verified spawning events, resulting in a longer spawning period. Moreover, the males spawned more (11.3 ± 4.6 as the first or second male) than the females (3.7 ± 1.8). The entire spawning period lasted 6 days; however, each individual was active only for a few days, and the timing varied among individuals. There were no specific mating pair combinations for the multiple verified spawning events. Further application of our technique would be instrumental in understanding the reproductive performance of fish with spawning aggregations.



中文翻译:

圈养石斑鱼聚集中的个体产卵性能和交配对组合

在鱼类中广泛观察到产卵聚集。然而,由于缺乏在整个产卵期进行个体识别的技术,很少测量聚集体中的个体繁殖性能。在这里,我们调查了 4 只雄性和 12 只雌性白纹石斑鱼 ( Epinephelus ongus ) 的个体繁殖性能。) 在圈养的模拟产卵聚集中。通过使用精细深度数据记录器监测一对或一组鱼同时上升的冲刺来观察繁殖行为。在这项研究中,我们根据夜间观察和补充实验将经过验证的产卵事件定义为满足提取条件的同步上升。在实验过程中,在 4 只雄性和 10 只雌性之间提取了 37 个经过验证的产卵事件;经核实的产卵事件中有 29 起涉及一雌一雄,八起事件涉及一雌两雄。还确定了一个假定的和七个错误的产卵事件。具有较高脂质密度的个体参与更多经过验证的产卵事件,从而导致更长的产卵期。此外,雄性产卵更多(11.3 ± 4. 6 作为第一个或第二个男性)比女性(3.7 ± 1.8)。整个产卵期持续6天;然而,每个人只活跃了几天,而且时间因人而异。多次验证的产卵事件没有特定的交配配对组合。进一步应用我们的技术将有助于了解具有产卵聚集体的鱼类的繁殖性能。

更新日期:2022-02-24
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