Rhythms and Clocks in Aquatic Animals

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

Deadline for manuscript submissions: 31 July 2025 | Viewed by 338

Special Issue Editor


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Guest Editor
College of Animal Science and Veterinary Medicine, Shenyang Agricultural University, Shenyang, China
Interests: circadian rhythms; aquatic animals; physiology; behavior; ecology
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Special Issue Information

Dear Colleagues,

The rhythmic patterns of life are deeply ingrained in the biological processes of organisms, governed by internal clocks that adapt to environmental cycles. Aquatic animals, ranging from microscopic zooplankton to apex marine predators, are no exception. These organisms exhibit a variety of rhythms—from daily circadian cycles to tidal and seasonal fluctuations—that regulate their physiology, behavior, and ecological interactions.

Despite the growing recognition of the significance of biological rhythms, the intricate mechanisms and diverse manifestations of these rhythms in aquatic animals remain underexplored compared to terrestrial species. This Special Issue, "Rhythms and Clocks in Aquatic Animals", seeks to deepen our understanding of the temporal dynamics shaping aquatic life.

We invite researchers to contribute original research, comprehensive reviews, and other article formats that delve into the multifaceted world of biological rhythms in aquatic organisms. Topics of interest include, but are not limited to, the following:

  1. The molecular basis and mechanisms of biological clocks in aquatic species;
  2. Entrainment of rhythms by environmental cues such as light, temperature, and tides;
  3. The interplay between biological rhythms and physiological processes like metabolism, reproduction, and immune response;
  4. Behavioral rhythms and their ecological implications, including migration, feeding, and predator–prey interactions;
  5. Disruptions of biological rhythms due to environmental changes, pollution, or anthropogenic influences and their impact on aquatic ecosystems.

Dr. Yingdong Li
Guest Editor

Manuscript Submission Information

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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

  • biological rhythms
  • aquatic animals
  • molecular clocks
  • environmental entrainment
  • physiology
  • behavior
  • ecology
  • circadian disruption

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Published Papers (1 paper)

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Research

14 pages, 6326 KiB  
Article
Transcriptomic Responses of Gonadal Development to Photoperiod Regulation in Amur Minnow (Phoxinus lagowskii)
by Mingchao Zhang and Yingdong Li
Fishes 2025, 10(3), 137; https://doi.org/10.3390/fishes10030137 - 20 Mar 2025
Viewed by 211
Abstract
Photoperiod regulates reproductive physiology in many fishes, but its sex-specific molecular effects under artificial manipulation remain unclear, especially in cold-water species. In this study, we investigated whether photoperiod manipulation during the reproductive season could modulate the rate and efficiency of gonadal development in [...] Read more.
Photoperiod regulates reproductive physiology in many fishes, but its sex-specific molecular effects under artificial manipulation remain unclear, especially in cold-water species. In this study, we investigated whether photoperiod manipulation during the reproductive season could modulate the rate and efficiency of gonadal development in the Amur minnow (Phoxinus lagowskii). High-throughput RNA sequencing was used to analyze transcriptomic responses of gonadal tissues under three photoperiod regimes: natural light (12L:12D), continuous light (24L:0D), and continuous darkness (0L:24D) over a 9-week experimental period. Our results revealed distinct sex-specific gonadal responses to photoperiodic changes. In males, continuous light significantly promoted spermatogenesis by upregulating meiosis-related genes (REC114 and syp3) and steroid biosynthesis. In females, prolonged light exposure induced ovarian stress, evidenced by vitellogenin (Vtg3) upregulation and retinoic acid suppression, whereas continuous darkness promoted lipid storage via downregulation of gluconeogenesis (PC and Fbp2) and fatty acid oxidation (ACSL1a). Additionally, immune activation, marked by IL1RAPL1-A upregulation, was observed in all groups except continuous-light males, with females exhibiting broader immune pathway engagement. These findings provide novel insights into the regulatory mechanisms of photoperiod-induced gonadal development and highlight potential strategies for optimising photoperiod management in cold-water fish aquaculture. Full article
(This article belongs to the Special Issue Rhythms and Clocks in Aquatic Animals)
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