School of Biology, Aristotle University of Thessaloniki, Thessaloniki, Greece.
Marine and Environmental Research Laboratory, Limassol, Cyprus.
J Fish Biol. 2022 Feb;100(2):574-581. doi: 10.1111/jfb.14971. Epub 2021 Dec 20.
The lionfish Pterois miles invaded the Mediterranean Sea in 2012 and spread fast to the entire eastern basin. This study provides evidence of successful spawning and the first detailed analysis of P. miles ovarian dynamics in the Mediterranean Sea. The ovarian reproductive phases of mature females collected from Cyprus (eastern Mediterranean) between September 2017 and August 2018 were analysed, both macroscopically and histologically. The results suggested a prolonged oocyte recruitment and development season, and a spawning season that primarily occurred during summertime, even though spawning-capable females were caught also in autumn. A year-round spawning activity may have been inhibited due to seasonal variations in water temperature. Multiple oocyte developmental stages co-occurred in females at different reproductive phases, indicating that more than one oocyte batches were released per spawning season. The analysis of the spawning batch formation enabled the batch fecundity estimation at 3225-63149 oocytes. The oocyte development pattern described in this study shared characteristics with the indeterminate fecundity type, where new oocytes are recruited to the secondary growth phase in parallel with spawning activity. Climate change is likely to extend the spawning season of lionfish in the Mediterranean Sea and further favour its invasion. The information provided in this study is vital for the design of strategic and effective management plans to restrain the expansion of this highly invasive fish.
狮子鱼 Pterois miles 于 2012 年入侵地中海，并迅速扩散至整个东部海域。本研究提供了狮子鱼在该海域成功繁殖的证据，并首次对其卵巢动态进行了详细分析。本研究对 2017 年 9 月至 2018 年 8 月期间在塞浦路斯（东地中海）采集的成熟雌性狮子鱼的卵巢生殖阶段进行了宏观和组织学分析。结果表明，其卵母细胞的募集和发育季节延长，产卵季节主要发生在夏季，尽管也在秋季捕获了具有产卵能力的雌性个体。由于水温的季节性变化，全年的产卵活动可能受到抑制。不同繁殖阶段的雌性个体中存在多个卵母细胞发育阶段，表明每个产卵季节都会释放多个卵母细胞批次。通过对产卵批次形成的分析，可估算出每个批次的产卵量为 3225-63149 个。本研究中描述的卵母细胞发育模式与不定数量的繁殖类型具有共同特征，即在产卵活动的同时，新的卵母细胞被募集到次级生长阶段。气候变化可能会延长狮子鱼在地中海的产卵季节，并进一步有利于其入侵。本研究提供的信息对于设计战略和有效的管理计划以限制这种高度入侵鱼类的扩张至关重要。
