The reproductive biology of Ellochelon vaigiensis from the Vietnamese Mekong Delta.

Autor: Dinh QM; Department of Biology, School of Education Can Tho University Can Tho Vietnam., Truong NT; Department of Molecular Biotechnology Institute of Food and Biotechnology, Can Tho University Can Tho Vietnam., Nguyen THD; Department of Biology, School of Education Can Tho University Can Tho Vietnam., Lam TTH; Department of Molecular Biotechnology Institute of Food and Biotechnology, Can Tho University Can Tho Vietnam.; Institute of High Quality Biotechnology Food Technology Cuu Long University Vinh Long Vietnam., Nguyen TTK; Department of Biology An Khanh High School, An Khanh Ward Can Tho Vietnam., Jaafar Z; Department of Biological Sciences National University of Singapore Singapore Singapore.
Jazyk: angličtina
Zdroj: Ecology and evolution [Ecol Evol] 2024 Feb 14; Vol. 14 (2), pp. e11033. Date of Electronic Publication: 2024 Feb 14 (Print Publication: 2024).
DOI: 10.1002/ece3.11033
Abstrakt: The Squaretail mullet, Ellochelon vaigiensis , is a commercial fish species distributed throughout the Indo-Pacific region. This species tolerates wide variations in salinity, having been reported from both freshwater and marine habitats. Although economically significant, there is little information on its reproduction, especially in the Vietnamese Mekong Delta (VMD), where it is heavily extracted. Our study elucidates the breeding pattern, seasonality, first length at maturity, as well as potential and relative fecundity of this species. Fish specimens were collected by trawl nets from November 2020 to October 2021 at four estuarine sites within the VMD. We found this species to be a synchronous spawner, with peaks in reproductive activity from June to September. In the populations we surveyed, there was significant dominance of males (1.26:1.00) based on 942 fish samples (526 males and 416 females). The length at 50% maturity for females was significantly higher than for males at all sites and ranged from 10.6 to 19.3 cm. The diameter of the eggs examined for this species exhibited slight variation, from 0.43 to 0.54 mm. The potential fecundity ranged from 246,254 ± 35,878 to 411,970 ± 54,370 eggs, corresponding to female length and weight of 26.7-32.6 cm and 102.97-234.19 g, respectively. Relative fecundity values were highest at Thanh Phu, Ben Tre (6388 ± 605 eggs), and Dong Hai, Bac Lieu (6461 ± 637 eggs), followed by Tran De, Soc Trang (4729 ± 408), and were found to be lowest at Duyen Hai, Tra Vinh (3117 ± 223 eggs). Information on reproductive behavior in this species has far-reaching impacts on sustainable extractions, stock conservation, and aquaculture.
Competing Interests: The authors declare that they have no competing interests.
(© 2024 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd.)
Databáze: MEDLINE
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