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Fishes
Special Issues
The Environmental and Genetic Regulation of Fish Reproduction
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The Environmental and Genetic Regulation of Fish Reproduction

A special issue of Fishes (ISSN 2410-3888). This special issue belongs to the section "Genetics and Biotechnology".

Deadline for manuscript submissions: closed (31 January 2023) | Viewed by 2402

Special Issue Editor

Dr. Thomas William Kenneth Fraser

E-Mail Website
Guest Editor
Institute of Marine Research, Matre Aquaculture Research Station, 5984 Matredal, Norway
Interests: aquaculture; life history; reproduction; sterility; endocrinology; polyploidy; functional genomics; toxicology; behaviour; stress; bone health; allometry; welfare

Special Issue Information

Dear Colleagues,

Reproduction is a developmental process that continues throughout ontogeny. It is energetically expensive and has led to multiple strategies within and across species to maximise lifetime fitness. More recently, interest in the factors that regulate reproduction has increased due to their importance in maintaining fish stocks, protecting natural biodiversity, and closing the life-cycle for captive rearing in pursuit of commercial aquaculture, scientific study (lab animals), hobbyism (home aquaria), or re-stocking. 

In this Special Issue, we welcome new research and review articles into how the environment and genetics, either alone or in combination, regulate reproduction in fishes. The research can address endocrinological, energetic, physiological, molecular, biochemical, anatomical, or behavioural aspects of reproduction. This may also be in the context of reproduction in the wild or in captivity.

Dr. Thomas William Kenneth Fraser
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Fishes is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • gametogenesis
  • spermatogenesis
  • oogenesis
  • brain–pituitary–gonad axis

Published Papers (1 paper)

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Research

20 pages, 3337 KiB  
Article
Constant High Temperature Promotes Early Changes in Testis Development Associated with Sexual Maturation in Male Atlantic Salmon (Salmo salar L.) Post-Smolts
by Enrique Pino Martinez, Markus Førde Braanaas, Pablo Balseiro, Marianne Kraugerud, Cindy Pedrosa, Albert Kjartan Dagbjartarson Imsland and Sigurd O. Handeland
Fishes 2022, 7(6), 341; https://doi.org/10.3390/fishes7060341 - 22 Nov 2022
Viewed by 1919
Abstract
Sexual maturation of post-smolts is a concern for Atlantic salmon producers, and its occurrence is dependent upon factors such as water temperature and energy availability, among others. The present study was designed to investigate the effect of different temperatures and feeding regimes on [...] Read more.
Sexual maturation of post-smolts is a concern for Atlantic salmon producers, and its occurrence is dependent upon factors such as water temperature and energy availability, among others. The present study was designed to investigate the effect of different temperatures and feeding regimes on testis development and local regulation of spermatogenesis in salmon post-smolts. A 3 × 2 factorial design was used, with three temperatures (8 °C, 12.5 °C, and 18 °C) and two feed regimes (100% and 67% ration). Salmon (1800 parr, initial mean weight 23.1 ± 7.2 g) were reared from 28 October 2018 to 30 May 2019 in a freshwater flow-through system under continuous light (LD24:0), except for a 5-week winter signal (LD12:12) introduced on 4 February 2019. Testis histology, transcription of follicle-stimulating hormone receptor (fshr) and luteinizing hormone receptor (lhr), and transcription of testis proteins involved in spermatogenesis regulation such as gonadal-soma-derived factors 1 (gsdf1) and 2 (gsdf2), anti-Müllerian hormone (amh), and insulin-like growth factor-3 (igf3), were analyzed. Results showed that high temperature alone (18 °C), irrespective of the feed regime, promoted early presence of type B spermatogonia and reduced transcript levels of the proliferation-inhibitory factor amh in males still considered immature, of groups 18–100% and 18–67% that later matured in high proportion (~100%). This effect was also present to some degree in the group 12.5–100% (40% maturation), and absent in 12.5–67%, 8–100%, and 8–67% (groups with little or no maturation). Later, at onset of rapid testis growth, high temperature was linked to a pronounced downregulation of amh and of the self-renewal factors gsdf1 and gsdf2, as well as to a pronounced upregulation of the proliferation-stimulating factor igf3. Overall, the present findings demonstrate that rearing salmon at high temperatures can stimulate an early activation of the brain–pituitary–gonad axis before actual onset of rapid testis growth, enhancing and accelerating the mechanisms that control initiation and progression of maturation, while the feed regime has a minor impact. This poses a challenge for current salmon aquaculture practices that use sustained high temperature to maximize growth, since these practices increase the risk of early post-smolt maturation. Full article
(This article belongs to the Special Issue The Environmental and Genetic Regulation of Fish Reproduction)
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