Elevated water temperature in combination with an increase in daylength stimulate a synchronized onset of spermatogenesis in male Atlantic salmon (Salmo salar, L.) postsmolts

IF 2.3 3区 农林科学 Q2 FISHERIES Journal of The World Aquaculture Society Pub Date : 2024-07-12 DOI:10.1111/jwas.13090
Enrique Pino-Martinez, Kari Anne Kamlund, Pablo Balseiro, Marianne Kraugerud, Albert Kjartan Dagbjartarson Imsland, Sigurd O. Handeland
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Abstract

Male postsmolt maturation (“jacking”) is undesired in Atlantic salmon aquaculture due to economic and welfare impacts. Unfortunately, incidence of jacking has increased linked to intensive rearing conditions. This study subjected 1000 salmon (52.1 ± 5.2 g) to one of two temperatures (15, 12.5°C) and one of two photoperiods (constant light-LL, a 5-week LD12:12 winter signal regime-WS) to assess their effects on spermatogenesis regulation. Indicators included testis histology images, mRNA transcription of gonadotropin receptors for follicle-stimulating hormone (fshr) and luteinizing hormone (lhr), and of factors regulating spermatogenesis like anti-Müllerian hormone (amh), gonadal-soma-derived factors 1 and 2 (gsdf1 and gsdf2), and insulin-like growth factor-3 (igf3). High temperature (15°C) induced early testis development processes irrespective of photoperiod, evidenced by presence of type B spermatogonia before clear increases in testis size or any transcriptional changes. The winter signal at 15°C caused a synchronized onset of spermatogenesis not present under constant light. This was evidenced by a pronounced downregulation of the spermatogenesis-inhibiting factor amh and a clear upregulation in the stimulating factor igf3. Consequently, combining high temperatures with winter signal regimes pose risk; high temperature can stimulate early cellular/endocrine processes of spermatogenesis, which can later be synchronized in the population by an increase in daylength.

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水温升高与昼长增加共同刺激雄性大西洋鲑(Salmo salar, L.)蜕皮后精子发生的同步开始
由于经济和福利方面的影响,大西洋鲑水产养殖中不希望出现雄性蜕皮后成熟("顶头")现象。不幸的是,与密集饲养条件有关的 "打顶 "发生率有所增加。本研究将 1000 尾鲑鱼(52.1 ± 5.2 克)置于两种温度(15、12.5°C)和两种光周期(恒定光照-LL、5 周 LD12:12 冬季信号制度-WS)中的一种,以评估它们对精子发生调节的影响。指标包括睾丸组织学图像、促卵泡激素(fshr)和促黄体生成素(lhr)的促性腺激素受体的mRNA转录,以及抗缪勒氏管激素(amh)、性腺瘤衍生因子1和2(gsdf1和gsdf2)和胰岛素样生长因子-3(igf3)等精子发生调节因子的mRNA转录。无论光周期如何,高温(15°C)都会诱导睾丸的早期发育过程,在睾丸体积明显增大或转录发生任何变化之前,B型精原细胞的存在就证明了这一点。15°C 的冬季信号导致精子发生同步开始,这在恒定光照下是不存在的。精子发生抑制因子amh的明显下调和刺激因子igf3的明显上调证明了这一点。因此,将高温与冬季信号机制结合在一起会带来风险;高温会刺激精子发生的早期细胞/内分泌过程,日照时间的增加会使精子发生在群体中同步进行。
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来源期刊
CiteScore
5.90
自引率
7.10%
发文量
69
审稿时长
2 months
期刊介绍: The Journal of the World Aquaculture Society is an international scientific journal publishing original research on the culture of aquatic plants and animals including: Nutrition; Disease; Genetics and breeding; Physiology; Environmental quality; Culture systems engineering; Husbandry practices; Economics and marketing.
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