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...

Descripción completa

Detalles Bibliográficos
Autores principales: López, P.A., Sánchez, S., Murgas, L. D. S., Vigliano, F. A.
Formato: Artículo revista
Lenguaje:Español
Publicado: Universidad Nacional del Nordeste 2025
Materias:
reproductive success
folliculogenesis
juveniles
culture
environmental control
éxito reproductivo
foliculogénesis
cultivo
control ambiental
Acceso en línea:https://revistas.unne.edu.ar/index.php/vet/article/view/8085
Aporte de:
Revistas UNNE - Universidad Nacional del Noroeste (UNNE) de Universidad Nacional del Nordeste
id I48-R154-article-8085
record_format ojs
institution Universidad Nacional del Nordeste
institution_str I-48
repository_str R-154
container_title_str Revistas UNNE - Universidad Nacional del Noroeste (UNNE)
language Español
format Artículo revista
topic reproductive success
folliculogenesis
juveniles
culture
environmental control
éxito reproductivo
foliculogénesis
juveniles
cultivo
control ambiental
spellingShingle reproductive success
folliculogenesis
juveniles
culture
environmental control
éxito reproductivo
foliculogénesis
juveniles
cultivo
control ambiental
López, P.A.
Sánchez, S.
Murgas, L. D. S.
Vigliano, F. A.
Reproduction of Gymnotus omarorum (Linnaeus, 1758) and its impact on gonadal development under different captivity conditions
topic_facet reproductive success
folliculogenesis
juveniles
culture
environmental control
éxito reproductivo
foliculogénesis
juveniles
cultivo
control ambiental
author López, P.A.
Sánchez, S.
Murgas, L. D. S.
Vigliano, F. A.
author_facet López, P.A.
Sánchez, S.
Murgas, L. D. S.
Vigliano, F. A.
author_sort López, P.A.
title Reproduction of Gymnotus omarorum (Linnaeus, 1758) and its impact on gonadal development under different captivity conditions
title_short Reproduction of Gymnotus omarorum (Linnaeus, 1758) and its impact on gonadal development under different captivity conditions
title_full Reproduction of Gymnotus omarorum (Linnaeus, 1758) and its impact on gonadal development under different captivity conditions
title_fullStr Reproduction of Gymnotus omarorum (Linnaeus, 1758) and its impact on gonadal development under different captivity conditions
title_full_unstemmed Reproduction of Gymnotus omarorum (Linnaeus, 1758) and its impact on gonadal development under different captivity conditions
title_sort reproduction of gymnotus omarorum (linnaeus, 1758) and its impact on gonadal development under different captivity conditions
description 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.
publisher Universidad Nacional del Nordeste
publishDate 2025
url https://revistas.unne.edu.ar/index.php/vet/article/view/8085
work_keys_str_mv AT lopezpa reproductionofgymnotusomarorumlinnaeus1758anditsimpactongonadaldevelopmentunderdifferentcaptivityconditions
AT sanchezs reproductionofgymnotusomarorumlinnaeus1758anditsimpactongonadaldevelopmentunderdifferentcaptivityconditions
AT murgaslds reproductionofgymnotusomarorumlinnaeus1758anditsimpactongonadaldevelopmentunderdifferentcaptivityconditions
AT viglianofa reproductionofgymnotusomarorumlinnaeus1758anditsimpactongonadaldevelopmentunderdifferentcaptivityconditions
AT lopezpa reproduccionencautiveriodegymnotusomarorumlinnaeus1758ysuimpactoeneldesarrollogonadalbajodistintascondicionesambientales
AT sanchezs reproduccionencautiveriodegymnotusomarorumlinnaeus1758ysuimpactoeneldesarrollogonadalbajodistintascondicionesambientales
AT murgaslds reproduccionencautiveriodegymnotusomarorumlinnaeus1758ysuimpactoeneldesarrollogonadalbajodistintascondicionesambientales
AT viglianofa reproduccionencautiveriodegymnotusomarorumlinnaeus1758ysuimpactoeneldesarrollogonadalbajodistintascondicionesambientales
first_indexed 2025-05-17T05:10:39Z
last_indexed 2025-05-17T05:10:39Z
_version_ 1832343190029467648
spelling I48-R154-article-80852025-02-12T21:58:20Z Reproduction of Gymnotus omarorum (Linnaeus, 1758) and its impact on gonadal development under different captivity conditions Reproducción en cautiverio de Gymnotus omarorum (Linnaeus 1758) y su impacto en el desarrollo gonadal bajo distintas condiciones ambientales López, P.A. Sánchez, S. Murgas, L. D. S. Vigliano, F. A. reproductive success folliculogenesis juveniles culture environmental control éxito reproductivo foliculogénesis juveniles cultivo control ambiental 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. La cría de morenas (Gymnotus omarorum) en cautiverio puede contribuir a la preservación de las poblaciones naturales, así como mejorar las condiciones de trabajo de los pescadores de carnada y sostener la demanda de los pescadores deportivos. El objetivo de este trabajo fue evaluar la respuesta de G. omarorum a la inducción hormonal de la reproducción combinada con el manejo de factores ambientales, y determinar los efectos de las condiciones de cautiverio sobre la maduración gonadal y el éxito reproductivo. Se realizaron dos experiencias, la primera con grupos a ser inducidos hormonalmente comparada con grupo control (sin inducción). La segunda evaluó la maduración gonadal en grupos mantenidos bajo condiciones seminaturales o de laboratorio. En la primera experiencia, la reproducción se produjo de manera espontánea en los estanques, antes de llevar a cabo la inducción hormonal programada. En la segunda experiencia, las hembras del grupo mantenido en condiciones de laboratorio mostraron un aumento significativo de ovocitos en regresión, así como una reducción significativa en el número de ovocitos vitelogénicos. Sin embargo, los ejemplares de este grupo lograron reproducirse luego de ser trasladados a estanques bajo condiciones seminaturales. Este hecho demostró una recuperación de la capacidad reproductiva. Por otro lado, las hembras del grupo mantenido en condiciones seminaturales no mostraron cambios en el número de ovocitos en regresión. En este grupo, es posible que se hayan dado dos eventos reproductivos de acuerdo con las diferencias de tamaño y la coloración existente en larvas y juveniles capturados al final de la experiencia. Los resultados del presente estudio demuestran que la cría de G. omarorum bajo condiciones seminaturales permite desencadenar la reproducción de manera espontánea sin necesidad de llevar a cabo la inducción hormonal, destacándose como una actividad promisoria para el desarrollo productivo de esta especie.  Universidad Nacional del Nordeste 2025-02-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://revistas.unne.edu.ar/index.php/vet/article/view/8085 10.30972/vet.3618085 Revista Veterinaria; Vol. 36 Núm. 1 (2025); 1-14 1669-6840 1668-4834 spa https://revistas.unne.edu.ar/index.php/vet/article/view/8085/7619 https://creativecommons.org/licenses/by-nc/4.0

Ejemplares similares