Biometric Indices of Tank Goby Glossogobius giuris (Hamilton, 1822) from a wetland ecosystem (Bhutiyar Beel), southern Bangladesh

The Tank Goby Glossogobius giuris, is a prominent freshwater species belonging to the family Gobiidae. This study primarily investigated the growth pattern, condition and form factor of G. giuris sampled from the wetland ecosystem of Bhutiyar Beel in southern Bangladesh. A total of 300 individuals were sampled from commercial fishers on a seasonal basis (pre-monsoon, monsoon and post-monsoon) during 2023, with recording of length and weight of each specimen. Total length (TL) ranged from 5.9 to 16.4 cm while body weight (BW) varied from 1.80 to 43.70 g. Overall, the species exhibited a negative allometric growth pattern, with a strong correlation in the length-length relationship (LLR) documented (r2 = 0.967). The assessed value (0.0068) of form factor (a3.0) indicated an eel-like body shape. Further, the average value of Fulton’s condition factor (KF) was estimated to be well below 1, indicating suboptimal health status. The findings of this study will contribute to the development of effective conservation policies for this fish species in the Bhutiyar Beel and connected ecosystems.