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Fishes
Special Issues
Genetics and Breeding of Fishes
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Genetics and Breeding of Fishes

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

Deadline for manuscript submissions: 10 April 2026 | Viewed by 1541

Special Issue Editor

Dr. Wuhui Li

E-Mail Website
Guest Editor
Engineering Research Center of Polyploid Fish Reproduction and Breeding of the State Education Ministry, College of Life Sciences, Hunan Normal University, Changsha 410081, China
Interests: fish; reproduction and breeding; genetics and genomics; heterosis; sustainable aquaculture

Special Issue Information

Dear Colleagues,

Fish and aquatic products with high-quality protein and high-quality fat are an important human food source. However, the traditional aquaculture model is faced with resource-based and environmental constraints, a lack of technological innovation ability in the seed-production industry, and the degradation of germplasm, which restricts the development of sustainable aquaculture practices. Germplasm innovation and efficient aquaculture practices are important in ensuring the sustainable development of aquatic products; therefore, there is a need to consolidate the latest information regarding fish breeding and aquaculture development. This Special Issue aims to provide the latest information on fish breeding technologies and sustainable aquaculture. Submissions may take the form of original research, full or mini-reviews, and perspectives on topics including, but not limited to, the following:

  • Genetic breeding techniques (selective breeding, hybridization, gynogenesis, gene editing, etc.), more generally for aquatic animals;
  • The evaluation of phenotype and genetic traits;
  • The evaluation of important characteristics (growth, disease resistance, stress tolerance, etc.);
  • Nutrition and metabolism;
  • New technology or systems for sustainable aquaculture;
  • Precision feeding, waste reduction strategies, and water quality management.

Dr. Wuhui Li
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 250 words) can be sent to the Editorial Office for assessment.

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

  • fish breeding techniques
  • reproduction
  • genetics and genomics
  • sustainable aquaculture

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Further information on MDPI's Special Issue policies can be found here.

Published Papers (3 papers)

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Research

12 pages, 1045 KB  
Article
Gene Expression and Antioxidant Characteristics of Rainbow Trout (Oncorhynchus mykiss) Eggs Used for Meiotic Gynogenesis
by Konrad Ocalewicz, Karolina Pałucha, Agata Błaszczyk, Marcin Kuciński, Stefan Dobosz, Ligia Panasiak and Rafał Rożyński
Fishes 2025, 10(11), 585; https://doi.org/10.3390/fishes10110585 - 13 Nov 2025
Viewed by 333
Abstract
Gynogenesis is a reproductive mode where offspring inherit exclusively maternal chromosomes. Gynogenetic development in fish may be induced intentionally by activating eggs with the UV-irradiated, inactive spermatozoa. In the meiotic variant of gynogenesis, the resultant haploid gynogenetic zygote is then exposed to a [...] Read more.
Gynogenesis is a reproductive mode where offspring inherit exclusively maternal chromosomes. Gynogenetic development in fish may be induced intentionally by activating eggs with the UV-irradiated, inactive spermatozoa. In the meiotic variant of gynogenesis, the resultant haploid gynogenetic zygote is then exposed to a physical shock to inhibit the release of the 2nd polar body and to reconstitute the diploid state of the embryo. Here, meiotic gynogenesis was induced in the rainbow trout eggs from different clutches to find any differences in terms of gene expression and antioxidant enzyme activity between eggs with high and low ability for gynogenetic development. The survival rates of the gynogenotes after hatching from the eggs originating from five females varied from 16.6 ± 4.3% to 53.8 ± 9.8%. Biochemical and molecular examination revealed that eggs with higher developmental potential for meiotic gynogenesis exhibited significantly greater glutathione peroxidase (GPx) activity than eggs with lower efficiency of gynogenesis. Moreover, eggs exhibiting the highest ability for gynogenetic development showed increased transcription of the keratin 8 gene and decreased abundance of keratin 18 and tubulin β mRNA transcripts. Since keratins protect oocytes from physical stress after ovulation, the high abundance of keratin 8 in the rainbow trout eggs may increase their resilience to the physical shock applied for the zygote diploidization during gynogenesis. On the other hand, a low level of tubulin-building microtubules may increase the efficiency of high hydrostatic pressure (HHP) shock used for diploidization of the gynogenetic zygotes. Full article
(This article belongs to the Special Issue Genetics and Breeding of Fishes)
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12 pages, 3504 KB  
Article
Full-Length Transcriptome Reveals Heterologous Sperm Fragments in Natural Gynogenetic Grass Carp
by Lang Qin, Yuxiang Wang, Ming Wen, Jinhui Huang, Xu Huang, Qian Chen, Dan Peng, Yang Wu, Qianye Wei, Fangzhou Hu, Kaijun Gong, Chun Zhang, Qinbo Qin, Chang Wu and Shaojun Liu
Fishes 2025, 10(11), 570; https://doi.org/10.3390/fishes10110570 - 7 Nov 2025
Viewed by 392
Abstract
Grass carp (Ctenopharyngodon idella) is one of the most economically important cyprinid species cultured in China. The diploid gynogenetic grass carp (2nGGC, 2n = 48) was generated from the hybrid of female grass carp (GC, 2n = 48) and male topmouth [...] Read more.
Grass carp (Ctenopharyngodon idella) is one of the most economically important cyprinid species cultured in China. The diploid gynogenetic grass carp (2nGGC, 2n = 48) was generated from the hybrid of female grass carp (GC, 2n = 48) and male topmouth culter (TC, 2n = 48, Culter alburnus). This study obtained the full-length transcriptome of 2nGGC from five tissues using Pacific Biosciences (Pacbio) single-molecule real-time long-read isoform sequencing. Following the mapping of long reads to GC and TC reference genomes, a total of 1848 fusion isoforms were identified. Among them, 775 were distributed across different genomes, indicating that chimeric DNA fragments of TC were embedded in the 2nGGC genome. After removing the fusion genes and redundant isoforms, 107,721 full-length transcripts were obtained from 2nGGC, providing important full-length reference sequences for further research. Finally, comparative analysis of homologous gene variation identified 34 fragments in 2nGGC containing recombinant SNPs derived from both GC and TC. These results provide evidence that natural gynogenesis represents a form of “micro-hybridization” characterized by heterogeneous DNA fragments, distinct from traditional hybridization involving chromosome-level recombination. These findings offer valuable reference for fish genetic breeding. Full article
(This article belongs to the Special Issue Genetics and Breeding of Fishes)
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19 pages, 9104 KB  
Article
Integrated Analysis of Phenotypic and Hepatic Transcriptomic Profiles Reveals Enhanced Cold Tolerance in Triploid Crucian Carp
by Suifei Tao, Zexun Zhou, Shandong Chen, Jialin Cui, Yude Wang, Kaikun Luo, Wei Liu, Qingfeng Liu, Wuhui Li and Shaojun Liu
Fishes 2025, 10(10), 519; https://doi.org/10.3390/fishes10100519 - 12 Oct 2025
Viewed by 539
Abstract
Cold stress poses a critical threat to fish survival by triggering metabolic dysfunction, oxidative damage, immune suppression, and apoptosis. However, hybrid polyploid fish triploid crucian carp (3nRCR, 3n = 150) demonstrate superior stress tolerance. In this study, we investigated the cold adaptation mechanisms [...] Read more.
Cold stress poses a critical threat to fish survival by triggering metabolic dysfunction, oxidative damage, immune suppression, and apoptosis. However, hybrid polyploid fish triploid crucian carp (3nRCR, 3n = 150) demonstrate superior stress tolerance. In this study, we investigated the cold adaptation mechanisms in different ploidy cyprinid fishes: triploid crucian carp compared to its diploid improved red crucian carp (Carassius auratus red var., RCC, 2n = 100, ♀) and improved allotetraploid (4nAT, 4n = 200, ♂) progenitors. Under controlled cooling, 3nRCR lost equilibrium at a significantly lower temperature (3.2 °C) than RCC (4.0 °C) and 4nAT (4.5 °C), confirming its superior enhanced cold resistance. Histological examination revealed minimal tissue damage in 3nRCR, characterized by reduced gill inflammation and cellular apoptosis. Transcriptomics revealed triploid-specific molecular strategies: 3nRCR uniquely activated retinol metabolism and metabolic rewiring (arginine/proline metabolism, oxidative phosphorylation). Notably, in the immune-related NLR signaling pathway, both nlrp1 and nlrp3 (key inflammasome components) were significantly downregulated in 3nRCR (p < 0.01). In contrast, genes involved in endoplasmic reticulum (ER) stress response, including chop and nrf2, were markedly upregulated, indicating a reinforced cellular stress resolution mechanism absent in both RCC and 4nAT. Our results demonstrate that triploid cold adaptation is orchestrated through a balanced interaction among mitochondrial apoptosis, ER stress, and inflammasome pathways. These findings provide novel insights into hybrid polyploid adaptation mechanisms and targets for cold-resilient aquaculture breeding. Full article
(This article belongs to the Special Issue Genetics and Breeding of Fishes)
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