Variation in the allometry of morphometric characteristics, growth, and condition factors of wild Bostrychus sinensis (Butidae) in Northern Vietnam | [Pakistan Journal of Zoology • 2023]

Author(s):

1. Nam Thanh Nguyen: Science, Vietnam National University, Nguyen Trai, Thanh Xuan, Hanoi, Vietnam; University of Science, Vietnam National University, 19 Le Thanh Tong, Hoan Kiem, Hanoi, Vietnam

2. Linh Manh Ha: Nagasaki University, Nagasaki, Japan

3. Anh Thi Nguyen: Hanoi National University of Education, 136 Xuan Thuy, Cau Giay, Ha Noi, Viet Nam

4. Nam Hoang Chu: Hanoi National University of Education, 136 Xuan Thuy, Cau Giay, Ha Noi, Viet Nam

5. Hau Duc Tran: Hanoi National University of Education, 136 Xuan Thuy, Cau Giay, Ha Noi, Viet Nam

6. Hung Phuc Nguyen: Hanoi National University of Education, 136 Xuan Thuy, Cau Giay, Ha Noi, Viet Nam

7. Thuy Thi Ta: Hanoi Metropolitan University, 98 Duong Quang Ham, Cau Giay, Ha Noi, Viet Nam

Abstract:

The four-eyed sleeper (Bostrychus sinensis), found in the Indo-Pacific, is a commercial goby in Vietnam. Knowledge of the allometric growth patterns of morphometric characters, the length-weight relationship, and the conditions for assessing and managing the fish populations is unknown. The present study tested the intersex differences in growth of morphometric characters, sexual and seasonal change in lengthweight relationship, and growth conditions for this species based on a year-round (2018?2019) wild specimen collection in northern Vietnam. Four morphometric characteristics (standard length, pre-dorsalfin length, body depth, body width) showed higher growth rates in males than in females, suggesting a morphometric sexual dimorphism. The growth pattern of males and females were similarly higher than the isometric value of three, showing positive allometric growth in favorable environmental conditions. The slope values were higher in the dry season than in the wet season, but this was only significant in females. The higher intra-seasonal variability in the slope values was evaluated, showing females undergoing gonad depletion of the two sexes during their spawning season. The condition factors of both sexes were higher in the wet season when water temperature and food availability are higher. Female fish seemed to be more sensitive to environmental changes. The high value of the condition factors was shown for fish 9.9?12.8 cm in total length (slightly larger than the optimum size of 11.48). Based on these findings, for a sustainable exploitation plan, we suggest fishing B. sinensis from December to March, with a catch size of 9.9?12.8 cm in total length.

Page(s): 809-818

DOI: 10.17582/journal.pjz/20200917140936

Published: Journal: Pakistan Journal of Zoology, Volume: 55, Issue: 2, Year: 2023

Keywords:

Morphometry , Lengthweight relationship , Allometric growth , Sexual dimorphism , Lengthweight relationship , Foureyed sleeper goby

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