Stock assessment of the mud crab ( Scylla olivacea) collected from the terrestrial edge of the Sundarbans mangrove forest, Bangladesh.

Autor: Islam MK; Department of Fisheries and Marine Bioscience, Faculty of Biological Science and Technology, Jashore University of Science and Technology, Jashore, 7408, Bangladesh., Rahman MM; Department of Environmental Science and Technology, Faculty of Applied Science and Technology, Jashore, 7408, Bangladesh., Rahman MH; Department of Fisheries and Marine Bioscience, Faculty of Biological Science and Technology, Jashore University of Science and Technology, Jashore, 7408, Bangladesh., Shuchi ZJ; Department of Fisheries and Marine Bioscience, Faculty of Biological Science and Technology, Jashore University of Science and Technology, Jashore, 7408, Bangladesh., Nahar MS; Department of Fisheries and Marine Bioscience, Faculty of Biological Science and Technology, Jashore University of Science and Technology, Jashore, 7408, Bangladesh., Hasan MZ; Department of Fisheries and Marine Bioscience, Faculty of Biological Science and Technology, Jashore University of Science and Technology, Jashore, 7408, Bangladesh., Bari E; Department of Environmental Science and Technology, Faculty of Applied Science and Technology, Jashore, 7408, Bangladesh., Islam MS; Department of Fisheries and Marine Bioscience, Faculty of Biological Science and Technology, Jashore University of Science and Technology, Jashore, 7408, Bangladesh.
Jazyk: angličtina
Zdroj: Heliyon [Heliyon] 2024 Oct 16; Vol. 10 (20), pp. e39469. Date of Electronic Publication: 2024 Oct 16 (Print Publication: 2024).
DOI: 10.1016/j.heliyon.2024.e39469
Abstrakt: We estimated mud crab ( Scylla olivacea ) population parameters to determine recruitment patterns, asymptotic carapace width ( CW ∞ ), growth coefficient ( k ), mortality rate ( Z , M , and F ), exploitation rate ( E ) and relationship between body weight and carapace width ( BW - CW ) in the terrestrial edge of the Sundarbans mangrove forest, Bangladesh. Baited long lines and traps were used to collect crab samples from the terrestrial edge of the mangroves (up to 10 km inside of the Sundarbans mangroves) monthly for a year (Jan 2021-Dec 2021). These CW frequency data were utilized to determine population characteristics. Based on the BW  ×  CW relationship, male S. olivacea crabs increased their BW faster ( b  = 2.89, R 2  = 0.86) than females ( b  = 2.29, R 2  = 0.82). Crabs displayed negative growth allometry, b significantly differed from the isometric growth ( b  = 3). Both male and female CW ∞ was estimated to be 126.00 mm and 113.40 mm, with k values of 0.50 yr -1 and 0.48 yr -1 , respectively. The total mortality ( Z ), natural mortality ( M ), and fishing mortality ( F ) of male and female crabs were 1.89 yr -1 and 1.84 yr -1 , 0.79 yr -1 and 0.80 yr -1 and 1.10 yr -1 and 1.04 yr -1 respectively. Both sexes were recruited using a bimodal recruitment strategy, with a significant peak from March to June. However, young crabs were present year-round. The virtual population analysis (VPA) shows that males and females are caught at smaller sizes (60-90 mm). The estimated exploitation rate ( E ) exceeds (0.58 for males and 0.57 for females) the optimum exploitation level ( E  = 0.50) and E values were close to the projected maximum yield per exploitation rate (E max  = 0.655 for males and 0.647 for females) which indicated over-exploitation of the mud crabs from the territorial edge of the Sundarbans mangrove forest of Bangladesh and hence suggested for proper management.
Competing Interests: The authors declare the following financial interests/personal relationships which may be considered as potential competing interests:Md. Sherazul Islam reports financial support was provided by 10.13039/501100020039Bangladesh Academy of Sciences. On behalf of the authors, I declared that the authors don't have any conflict of interest to publish our manuscript entitled “Stock assessment of the mud crab (Scylla olivacea) collected from the terrestrial edge of the Sundarbans mangrove forest, Bangladesh” to publish in your reputed journal ‘Heliyon’. If there are other authors, they declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(© 2024 The Authors.)
Databáze: MEDLINE
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