Abstract
Seasonal abundance of zooplankton in relation to different physico-chemical conditions of Kaptai lake has been studied. A total of four major groups of zooplankton were identified from study area of Kaptai lake during three seasons observation at pre-monsoon, monsoon and Post-monsoon. These four groups were categorized into rotifers, copepods, cladocerans and others (fish larvae, shrimp larvae, insects, mosquito larvae etc.). The mean abundance of group rotifers, copepods, cladoceras and others were 103, 84.67, 38.33 and 41.83 ind. L-1 respectively. The highest group was rotifers in terms of abundance and composition where compositions were recorded 38 % at three season’s observation. The lowest group was cladoceras in term of abundance and composition where compositions were recorded 14 %. The air temperature, water temperature, transparency, water pH, DO, BOD5, PO4-P, NO2-N, SiO3-Si, TSS, TDS, Alkalinity ranged between 21 and 27.50C, 23.5 and 31.50C, 0.8 and 3 m, 7.1 and 7.5, 5.72 and 8.58 mg/l, 8.55 and 12.87 mg/l, 3.22 and 4.13 μg/l, 0.992 and 1.19 μg/l, 161.18 and 201.15 μg/l, 0.28 and 0.48 g/l, 0.18 and 0.68 g/l, 40 and 60 ppm, respectively. Margalef richness index (d), Pielou’s evenness index (J'), Shannon-Wiener diversity index (H'), Simpson dominance index (λ) are analyzed by Primer V6 software to quantify the collected species. Through same software SIMPER, Cluster analysis also done to compare similarity between season.
 Asian J. Med. Biol. Res. December 2018, 4(4): 389-399
Highlights
The Lake Kaptai was created by damming the river Karnafully near Kaptai town in the Chittagong Hill Tracts (Lat. 22029 and Long. 92017 E)
The maximum air temperature (27.50±0.70 C) in pre-monsoon and water temperature (31.5±0.80 C) in monsoon was recorded while minimum air temperature (21.00±1.30 C) in post-monsoon and minimum water temperature (23.5±1.50 C) in post-monsoon was recorded and similar season wise temperature change observation was conducted by Zafar et al, (2017) and Shajib et al, (2017)
The zooplankton plays a vital role in aquatic food chain in Kaptai Lake
Summary
The Lake Kaptai was created by damming the river Karnafully near Kaptai town in the Chittagong Hill Tracts (Lat. 22029 and Long. 92017 E). The Dam was completed and spillway was closed in May, 1961. Occupying an average area of 58,300 ha (ARG, 1986), it is one of the largest reservoirs in Southeast Asia (Farnando, 1980). The lake was created primarily for hydro-electrical power generation, it has paved the way for substantial contribution to the national economy through freshwater fish production, navigation, irrigation and flood control. The Inland open water (capture) fish production of Bangladesh is 1,123,925 Mt (2008-2009).
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