Gonadal Maturation and Reproductive Timing in Batch Spawning Tropical Cypriniform Fishes Lobocheilos ovalis, Rasbora argyrotaenia and Tor tambra
ABSTRACT This study is the first to investigate the reproductive traits of Lobocheilos ovalis (n = 621), Rasbora argyrotaenia (n = 507) and Tor tambra (n = 138) through detailed gonad histology. We collected L. ovalis and R. argyrotaenia specimens from September 2017 to August 2019 and T. tambra fro...
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2024-12-01
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| Online Access: | https://doi.org/10.1002/aff2.70007 |
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| author | Rafhiah Kahar Norhayati Ahmad Takaomi Arai |
| author_facet | Rafhiah Kahar Norhayati Ahmad Takaomi Arai |
| author_sort | Rafhiah Kahar |
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| description | ABSTRACT This study is the first to investigate the reproductive traits of Lobocheilos ovalis (n = 621), Rasbora argyrotaenia (n = 507) and Tor tambra (n = 138) through detailed gonad histology. We collected L. ovalis and R. argyrotaenia specimens from September 2017 to August 2019 and T. tambra from July 2018 to August 2019 from tropical rainforest streams in Ulu Temburong National Park Brunei Darussalam. In all three species, females were larger and attained sexual maturation at larger sizes than males. Gonad histology categorized five reproductive phases in the ovarian and testicular maturation cycle comprising the immature, developing, spawning capable, regressing and regenerating phases. Ovarian histological markers of the reproductive phases included increasing oocyte diameters and gradual changes in cytoplasmic and nuclear features. In testes, decreasing nuclear diameters, darkening nuclear stains and germinal epithelium continuity were significant histological markers. Monthly frequencies of reproductive phases showed that L. ovalis and R. argyrotaenia were reproductively active throughout the year, whereas T. tambra exhibited protracted spawning over several months. Gonad histology also revealed asynchronous ovarian development and batch spawning, facilitating these species’ year‐round and protracted spawning. This reproductive strategy may be an adaptation for these species to increase the survival of offspring in hillstream habitats where flash floods are common. The present study significantly fills existing knowledge gaps in Southeast Asian cypriniform fishes, providing a reference point for gonad histology to elucidate the reproductive traits and ecology, particularly for the Lobocheilos, Rasbora and Tor genera. Importantly, it provides practical insights for the conservation and management of the wild populations of these species. |
| format | Article |
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| institution | Kabale University |
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| language | English |
| publishDate | 2024-12-01 |
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| spelling | doaj-art-c66a317f22f74427a936f91dc4fbbd8e2024-12-26T07:47:39ZengWileyAquaculture, Fish and Fisheries2693-88472024-12-0146n/an/a10.1002/aff2.70007Gonadal Maturation and Reproductive Timing in Batch Spawning Tropical Cypriniform Fishes Lobocheilos ovalis, Rasbora argyrotaenia and Tor tambraRafhiah Kahar0Norhayati Ahmad1Takaomi Arai2Institute for Biodiversity and Environmental Research Universiti Brunei Darussalam Bandar Seri Begawan Brunei DarussalamInstitute for Biodiversity and Environmental Research Universiti Brunei Darussalam Bandar Seri Begawan Brunei DarussalamEnvironmental and Life Sciences Programme, Faculty of Science Universiti Brunei Darussalam Bandar Seri Begawan Brunei DarussalamABSTRACT This study is the first to investigate the reproductive traits of Lobocheilos ovalis (n = 621), Rasbora argyrotaenia (n = 507) and Tor tambra (n = 138) through detailed gonad histology. We collected L. ovalis and R. argyrotaenia specimens from September 2017 to August 2019 and T. tambra from July 2018 to August 2019 from tropical rainforest streams in Ulu Temburong National Park Brunei Darussalam. In all three species, females were larger and attained sexual maturation at larger sizes than males. Gonad histology categorized five reproductive phases in the ovarian and testicular maturation cycle comprising the immature, developing, spawning capable, regressing and regenerating phases. Ovarian histological markers of the reproductive phases included increasing oocyte diameters and gradual changes in cytoplasmic and nuclear features. In testes, decreasing nuclear diameters, darkening nuclear stains and germinal epithelium continuity were significant histological markers. Monthly frequencies of reproductive phases showed that L. ovalis and R. argyrotaenia were reproductively active throughout the year, whereas T. tambra exhibited protracted spawning over several months. Gonad histology also revealed asynchronous ovarian development and batch spawning, facilitating these species’ year‐round and protracted spawning. This reproductive strategy may be an adaptation for these species to increase the survival of offspring in hillstream habitats where flash floods are common. The present study significantly fills existing knowledge gaps in Southeast Asian cypriniform fishes, providing a reference point for gonad histology to elucidate the reproductive traits and ecology, particularly for the Lobocheilos, Rasbora and Tor genera. Importantly, it provides practical insights for the conservation and management of the wild populations of these species.https://doi.org/10.1002/aff2.70007batch spawningcypriniform fishesgonadal histologyprotracted spawningreproductive traitsSoutheast Asia |
| spellingShingle | Rafhiah Kahar Norhayati Ahmad Takaomi Arai Gonadal Maturation and Reproductive Timing in Batch Spawning Tropical Cypriniform Fishes Lobocheilos ovalis, Rasbora argyrotaenia and Tor tambra Aquaculture, Fish and Fisheries batch spawning cypriniform fishes gonadal histology protracted spawning reproductive traits Southeast Asia |
| title | Gonadal Maturation and Reproductive Timing in Batch Spawning Tropical Cypriniform Fishes Lobocheilos ovalis, Rasbora argyrotaenia and Tor tambra |
| title_full | Gonadal Maturation and Reproductive Timing in Batch Spawning Tropical Cypriniform Fishes Lobocheilos ovalis, Rasbora argyrotaenia and Tor tambra |
| title_fullStr | Gonadal Maturation and Reproductive Timing in Batch Spawning Tropical Cypriniform Fishes Lobocheilos ovalis, Rasbora argyrotaenia and Tor tambra |
| title_full_unstemmed | Gonadal Maturation and Reproductive Timing in Batch Spawning Tropical Cypriniform Fishes Lobocheilos ovalis, Rasbora argyrotaenia and Tor tambra |
| title_short | Gonadal Maturation and Reproductive Timing in Batch Spawning Tropical Cypriniform Fishes Lobocheilos ovalis, Rasbora argyrotaenia and Tor tambra |
| title_sort | gonadal maturation and reproductive timing in batch spawning tropical cypriniform fishes lobocheilos ovalis rasbora argyrotaenia and tor tambra |
| topic | batch spawning cypriniform fishes gonadal histology protracted spawning reproductive traits Southeast Asia |
| url | https://doi.org/10.1002/aff2.70007 |
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