Reproduction of Gymnotus omarorum (Linnaeus, 1758) and its impact on gonadal development under different captivity conditions
The reproduction and breeding of Gymnotus omarorum in captivity could improve the working conditions of bait fishermen, enhance services for sport fishing, and contribute to the preservation of natural populations. This study aimed to evaluate the response of G. omarorum to hormonal induction of rep...
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| Autores principales: | , , , |
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| Formato: | Artículo revista |
| Lenguaje: | Español |
| Publicado: |
Universidad Nacional del Nordeste
2025
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| Materias: | |
| Acceso en línea: | https://revistas.unne.edu.ar/index.php/vet/article/view/8085 |
| Aporte de: |
| Sumario: | The reproduction and breeding of Gymnotus omarorum in captivity could improve the working conditions of bait fishermen, enhance services for sport fishing, and contribute to the preservation of natural populations. This study aimed to evaluate the response of G. omarorum to hormonal induction of reproduction combined with environmental management factors, as well as to determine the effects of captive conditions on gonadal development and reproductive success. Two experiments were conducted. The first included hormonally induced and control groups maintained under semi-natural conditions, where reproduction occurred spontaneously in the fish tanks before the scheduled hormonal induction, approximately 80 days after the capture of wild broodstock. The second experiment compared two groups maintained under different captivity conditions (laboratory and semi-natural). Females kept under laboratory conditions showed a significant increase in regressing oocytes and a significant reduction in vitellogenic oocytes after the beginning of the experiment. However, these specimens successfully reproduced after being transferred to fish tanks under semi-natural conditions, demonstrating a recovery of reproductive capacity. Conversely, females in the semi-natural group did not exhibit changes in the number of regressing oocytes or any negative effects on reproductive performance. Evidence suggests that two reproductive events occurred in this group, as indicated by the size and coloration differences in larvae and juveniles captured at the end of the experiment. Additionally, the capture-to-reproduction interval in fish tanks under semi-natural conditions was shorter than previously reported. These findings highlight that breeding G. omarorum under semi-natural conditions can trigger spontaneous reproduction without the need for hormonal induction, making this approach a promising strategy for the productive development and conservation of this species. |
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