Title: Comparison of benthic fauna of two beels under differentmanagement system
Abstract: A comparative study of benthic fauna between Rajdhala beel and Padmai beel of
Netrakona District under different management system was carried out from July 1999 to
January 20OO. An average number of 1113 and 1175 organisms/m2 were obtained from
Rajdhala heel and Padmai beel respectively. A total of 22 taxa belonging to 8 diverse
groups, Oligochaetes, Chironomids, Molluscs, Ceratopogonids, Diptera (other than
Chironomids and Ceratopogonids), Ephemeroptera, Leeches and Crustaceans were
recorded. Oligochaetes were dominated and constituted 46% and 49% ofthe total benthic
population in Rajdhala heel and Padmai beel respectively. The next dominant group was
the Chironomids, which constituted 31% and 30% of the total benthic population in
Rajdhala beel and Padmai beel respectively. The highest number 1279 and 1437
individuals/m2 of benthic fauna was recorded in December from Rajdhla beel and
Padmai bee! in respectively. The lowest number of benthic fauna 869 and 914 individuals/m2 were found during September and July from Rajdhala beel and Padmai beel
respectively. Monthly variation of benthic fauna among two beels were found statistically
significant (p<0.05). The numerical distributions of benthic fauna was found to be
varied with depth ranges. However, the depth wise variation of total benthic fauna
between two heels was not found statistically significant. Fish yield of Rajdhala beel (488 kg/ha/yr) was appreciably higher than the Padmai beel (250 kg/ha/yr).
Publication Year: 2001
Publication Date: 2001-01-01
Language: en
Type: article
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