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Reproduction of Atlantic bluefin tuna
Fish and Fisheries ( IF 6.7 ) Pub Date : 2020-07-19 , DOI: 10.1111/faf.12489
Antonio Medina 1
Affiliation  

The reproductive success of fish populations depends on their reproductive potential and offspring survival to maturity. The reproductive potential affects recruitment and hence populations’ resilience and productivity. Extensive research carried out throughout the current century has improved our understanding of the reproductive biology of the Atlantic bluefin tuna (ABFT), Thunnus thynnus. Yet, crucial questions still remain unresolved. This paper examines key factors that drive ABFT reproductive performance (maturity, spawning frequency, fecundity, sex ratio, spawning habitat). Some reproductive variables (spawning at age, spawning omission, egg and offspring viability, parental effect) remain poorly investigated due to the enormous challenge of implementing the required research across the distribution range and over time. These fundamental traits of the reproductive life history, however, provide valuable information to fish stock assessment models and hence require further attention. There is a major debate as to the extent of similarity in reproductive traits between eastern and western ABFT stocks. Both stocks have been considered to display differing maturity schedules, which would result in different spawning rates and reproductive outputs. Yet, similarities have been found in major reproductive aspects suggesting that discrepancies between stocks may not be as broad as often assumed. Though substantial, the information acquired on ABFT reproduction over the years is still incomplete for adequately advising fisheries management. The present report provides a synthesis of the existing information on the reproductive biology of ABFT. It also identifies major research needs and analyses future research actions towards bridging current gaps in ABFT reproduction science.

中文翻译:

繁殖大西洋蓝鳍金枪鱼

鱼类种群的繁殖成功取决于其繁殖潜力和后代存活至成熟。繁殖潜力影响招聘,进而影响人口的适应力和生产力。在本世纪中进行的广泛研究提高了我们对大西洋蓝鳍金枪鱼(Thunnus thynnus)生殖生物学的理解。但是,关键问题仍然没有解决。本文研究了影响ABFT繁殖性能的关键因素(成熟度,产卵频率,繁殖力,性别比,产卵栖息地)。由于在整个分布范围和时间范围内实施所需研究的巨大挑战,一些生殖变量(年龄,产卵遗漏,卵和后代的生存力,育儿效应)仍未得到很好的研究。然而,生殖生活史的这些基本特征为鱼类种群评估模型提供了有价值的信息,因此需要进一步关注。关于东部和西部ABFT种群之间生殖性状的相似程度存在重大争议。两种股票都被视为显示不同的到期时间表,这将导致不同的产卵率和生殖产出。然而,在主要生殖方面已发现相似之处,表明种群之间的差异可能不像通常所想象的那样广泛。尽管这些信息很丰富,但多年来仍未获得有关ABFT繁殖的信息,不足以为渔业管理提供充分的咨询。本报告提供了关于ABFT生殖生物学的现有信息的综述。它还确定了主要的研究需求,并分析了未来的研究行动,以弥合ABFT繁殖科学方面的当前差距。多年来获取的关于ABFT繁殖的信息仍不完善,无法为渔业管理提供充分的建议。本报告提供了关于ABFT生殖生物学的现有信息的综述。它还确定了主要的研究需求,并分析了未来的研究行动,以弥合ABFT繁殖科学方面的当前差距。多年以来获取的关于ABFT繁殖的信息仍不完整,无法为渔业管理提供充分的咨询。本报告提供了关于ABFT生殖生物学的现有信息的综述。它还确定了主要的研究需求,并分析了未来的研究行动,以弥合ABFT繁殖科学方面的当前差距。
更新日期:2020-07-19
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