Estimation of Population Parameters of Glossogobius giuris in the Rabnabad Channel, Southern Bangladesh: Implications for Sustainable Management

Ferdous Ahamed (), Mohaiminul Haque Rakib, Dipto Roy, Hamida Akter and Zoarder Faruque Ahmed
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Ferdous Ahamed: Department of Fisheries Management, Patuakhali Science and Technology University, Patuakhali 8602, Bangladesh
Mohaiminul Haque Rakib: Department of Fisheries Management, Patuakhali Science and Technology University, Patuakhali 8602, Bangladesh
Dipto Roy: Department of Fisheries Management, Patuakhali Science and Technology University, Patuakhali 8602, Bangladesh
Hamida Akter: Department of Fisheries Management, Patuakhali Science and Technology University, Patuakhali 8602, Bangladesh
Zoarder Faruque Ahmed: Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

Sustainability, 2023, vol. 15, issue 13, 1-15

Abstract: The tank goby Glossogobius giuris is a commercially important dominant fish species in the Rabnabad Channel in southern Bangladesh. However, information on the population parameters of this species is not available to support its sustainable management. Therefore, the present study was undertaken to estimate the population parameters to understand both the current status and yield, and to suggest sustainable management measures for this species, using monthly samples collected from September 2021 to August 2022. Our results showed that the size of this species at first sexual maturity was 8.5 cm in total length (TL). The gonadosomatic index indicated a prolonged spawning season, with three peaks in January–February (minor peak), April–May (minor peak), and August–November (major peak). Recruitment occurred at ~8.2 cm TL for an extended period of the year with three pulses in March (major pulse), May–June (minor pulse), and December (minor pulse). The von Bertalanffy growth parameters were TL ∞ = 25.0 cm and K = 1.10 year −1 . The growth performance index and longevity were 2.84 and 2.7 years, respectively. The estimated fishing, natural, and total mortalities were 0.42, 2.00, and 2.42 year −1 , respectively. Therefore, the exploitation rate was 0.17, and the maximum sustainable yield was 0.37, indicating that the stock of G. giuris was not subjected to overexploitation. Hence, management intervention is not needed at this moment. Rather, a substantial amount of fishing pressure could be increased to obtain the maximum benefit.

Keywords: reproduction; recruitment; growth; mortality; yield (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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