Growth, Condition, Maturity and Mortality of the Dwarf Gourami, Trichogaster lalius (Hamilton, 1822) in a Wetland Ecosystem (Beel Dakatia), Southwestern Bangladesh

The dwarf gourami, Trichogaster lalius, is a low-cost freshwater edible fish for the people of South Asian countries containing variety essential nutrients. first wide-ranging explanation on population parameters specifically; length-frequency distribution (LFD), length-weight relationships (LWRs), length-length relationship (LLR), form factor (a3.0), condition factors (allometric, KA; Fulton’s, KF; relative, KR; relative weight, WR), size at sexual maturity (Lm) and natural mortality (Mw) T. lalius were estimated. 768 specimens collected over one calendar year (March 2019 to February 2020) from wetland ecosystem named Beel Dakatia, Khulna, southwestern Bangladesh through various traditional fishing gears. Lengths (in cm) weight g) assessed wooden fitted measuring scale digital balance with accuracy 0.1 cm 0.01g, respectively. In current study, total length ranged 2.6-9.9 while bodyweight 0.63-23.80 g lalius. TL classes 7.00 7.99 8.00 8.99 indicated numerically prominent groups. Moreover, calculated allometric coefficient (b) LWRs represented negative growth pattern (b<3.00) in Beel Dakatia. Noticeably, a3.0 was 0.015 signifying that fusiform shape. KF best-suited tool assess well-being among four types factors. According Wilcoxson signed-rank test, WR revealed significantly dissimilarities 100 (P<0.0001), unbalanced territory estimated Lm 5.91 (~6.0) Mw 1.28 year-1 Bangladesh. Finally, knowledge about biological aspects may be used improved management tools future.