Fisheries eco-biology of beel Koshba in Naogaon District

Abstract

The physical conditions of Beel Koshba consisting of water temperature(25.36±5.12°C/day), water depth (204.96±110.36cm/month) and water transparency (30.91±6.78cm/day) were recorded. The chemical parameters of total hardness, alkalinity, pH, DO, CO2 andammonia were 146.60±13.36 mg/l, 143.30±9.33 mg/l, 7.05±0.75, 6.03±1.08 mg/l, 8.64±0.88 mg/land 0.73±0.31 mg/l respectively. A total of 54 species of different vegetations 123 species ofphytoplankton and 73 species of zooplankton were recorded from the beel. A total of 104 speciesof fish and Annelids (8), arthropods (12), molluscs (15), amphibian (8), reptiles (21), avis (40) andmammals (12) were identified. Pesticidal toxic effluents contexts were also observed in the beelecosystem.Key words: Fisheries; Eco-Biology; Beel KoshbaDOI: 10.3329/ujzru.v28i0.5283Univ. j. zool. Rajshahi Univ. Vol. 28, 2010 pp. 33-39

Additions to the genus <i>Stigeoclonium</i> (Chlorophyta) as new records for Bangladesh

“…Thirty one taxa (23 species and 8 varieties) of Stigeoclonium (Family: Chaetophoraceae: Order: Chaetophorales) so far have been reported from Bangladesh (Islam 1963, 1972, Islam and Ahia 1964, Islam and Hossain 1978, Islam and Zaman 1975, Islam and Aziz 1979, Islam et al 1980, Khan and Islam 1998,1999 and comprehensive ecological notes on these have been mentioned (Khan and Islam 1993). Of these taxa, seven were described as new to science (Islam 1972, Khan andIslam 1998).…”