The present study was
carried out for a period of five months from July 2017 to November 2017 to
assess the fish biodiversity applying diversity indices for existing fish
species in Basuakhali beel under Terokhada upazilla, Khulna, Bangladesh. During
the study, a total of 38 fish species including 34 native and 4 exotic fish
species were recorded under 21 families belonging to 10 orders. Cypriniformes
(31.58%) was found as the most dominant order followed by Perciformes (18.42%),
Siluriformes and Channiformes (10.53%), Synbranchiformes and Decapoda (7.89%),
Tetraodontiformes (5.27%), Beloniformes, Cyprinodontiformes and
Osteoglossiformes (2.63%) respectively. Almost 57.89% of species were found
least concern, 13.16% near threatened, 10.53% vulnerable, 2.63% endangered and
15.79% were found not threatened in the biodiversity of Basuakhali beel. During
the study period average Shannon-Weaver diversity index (H') value was highest
in Rumer beel (2.38 ±0.10) and lowest in Gojalmari (1.40 ±0.15). Margalef
richness index (d) value was highest in Rumer beel (3.69±0.58) and lowest in
Abadh (1.55 ±0.31). Pielou’s evenness index (J’) value was highest in Abadh
(0.49 ±0.13) and lowest in Kumromari (0.43 ±0.06). Pielou’s index (J´) showed
the equal distribution pattern of fish species throughout the sampling area
indicating a stable condition. Simpson dominance index (C) value was highest in
Rumer beel (0.85 ±0.03) and lowest in Gojalmari (0.64 ±0.06). Eighteen
different kinds of fishing gears were identified under 4 major groups including
5 nets (current jal, ber jal, thela jal, veshal jal and punti jal), 6 traps
(guni, chari, charo, duor, tubo and polo), 4 hooks and line (koia borsi, dhun
borsi, chip borshi and borshi), 3 wounding gears (koach, anta and jupi) in the
beel. Besides, an inclusive management and conservation scheme is crying needed
for the beel fishery to enrich the fish species diversity of the Basuakhali
beel as well as the country.
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