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Reproductive physiology of bonefishes ( Albula spp.) across the Northwest Bahamas
Fish Physiology and Biochemistry ( IF 2.5 ) Pub Date : 2019-12-17 , DOI: 10.1007/s10695-019-00743-1
Sahar Mejri 1 , Cameron Luck 1 , Paul S Wills 1 , Aaron Adams 1, 2 , Jonathan Shenker 3 , Matthew J Ajemian 1
Affiliation  

Bonefishes (Albula spp.) are classified within the superorder Elopomorpha, which is comprised of over 1000 species that share a unique leptocephalus larval stage. Bonefishes have a circum-tropical distribution, inhabiting inshore shallow water flats and gathering in presumptive nearshore pre-spawn aggregations (PSA) during spawning months. These fishes support economically important recreational fisheries and subsistence fisheries throughout their ranges, yet little is known regarding their reproductive biology. Analysis of oocyte development and nutrient composition, and sex and gonadotrophic hormone levels, was conducted on females sampled in Grand Bahama, Central Andros, and South Andros, The Bahamas, to assess their reproductive state. Fish collected from the flats habitats along all three islands exhibited four major reproductive phases (immature, developing, spawning capable, and regressing). In contrast, all females captured at presumptive PSA sites had eggs in the final stage of oocyte maturation, significantly higher levels of all reproductive hormones (17β-estradiol, testosterone, and LH), larger vitellogenic oocytes, and oocytes exhibiting germinal vesicle migration and germinal vesicle breakdown. In addition, monthly variability in hormone levels and spawning readiness between Grand Bahama and Andros PSAs suggest that peak spawning times may differ among regions. Fatty acid and free amino acid composition and profiles, with high proportions of docosahexaenoic acid, histidine, and taurine, suggest that these nutrients are not only relevant as energy reserves, but also help achieve buoyancy and osmoregulation of oocytes. This study expands upon our understanding of fish reproductive and developmental physiology, and indicates potential factors influencing the survival and recruitment of bonefishes.



中文翻译:

巴哈马西北部的骨鱼(Albula spp。)的生殖生理

骨鱼(星云spp。spp。)归类于超阶Elopomorpha,该物种由1000多个物种组成,它们共享一个独特的小脑幼虫阶段。骨鱼分布在热带周围,栖息在近岸浅水滩,并在产卵月份聚集在推测的近岸产卵前聚集体(PSA)中。这些鱼类在其整个范围内都对具有重要经济意义的休闲渔业和自给渔业提供支持,但对其生殖生物学知之甚少。对在巴哈马中部大巴哈马和中部安德罗斯和南安德罗斯采样的雌性进行了卵母细胞发育和营养成分以及性别和促性腺激素水平的分析,以评估其生殖状态。从所有三个岛屿的平地栖息地收集的鱼类均表现出四个主要的繁殖阶段(未成熟,发育,生成能力强,然后回归)。相反,在推测的PSA部位捕获的所有雌性卵都在卵母细胞成熟的最后阶段,所有生殖激素(17β-雌二醇,睾丸激素和LH)的水平明显较高,卵黄生成卵母细胞更大,并且卵母细胞表现出生小泡迁移和生发。囊泡破裂。此外,大巴哈马和安德罗斯PSA之间激素水平的每月变化和产卵准备情况表明,各地区的产卵高峰时间可能有所不同。脂肪酸和游离氨基酸的组成和特征以及二十二碳六烯酸,组氨酸和牛磺酸的比例很高,表明这些营养素不仅与能量储备有关,而且有助于实现卵母细胞的浮力和渗透调节。

更新日期:2020-04-14
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