STUDY ON THE DIVERSITY AND SEASONAL VARIATION OF ZOOPLANKTON IN A BROOD POND, BANGLADESH

Abstract

Roy, U., Shaha,B.K., Mazhabuddin,Kh., Haque, M.F., Sarower, M.G. 2010. Study on the diversity and seasonal variation of zooplankton in a brood pond, Bangladesh. marine.res.aqua. 1(1):30-37. The present study was designed to estimate zooplankton abundance qualitatively and quantitatively in carp brood fish culture systems. Plankton samples were collected from Gallamari fisheries extension & training centre farm, Batiaghata, Khulna, one time in a month. A total 6 groups of zooplankton were found from the study ponds. The identified zooplanktons were under six orders namely copepoda, rotifera, cladocera, ostracoda, crustacean larvae and bryozoa. Numbers of zooplankton groups were recorded to be the highest in December. In the brood pond copepod was the dominant order. Among various orders of zooplankton, the percentages of copepoda, rotifera, cladocera, ostracoda and crustacean larvae brysozoa in brood fish culture system were 55%, 8%, 25%, 9%, 2% and 1% respectively. Copepoda was dominant in May, June, July, August, October, November and December but cladocera was dominant in September. Insect larvae were dominant in all month of study period. Bryozoa was found only in December. Five physico-chemical parameters were also studied during study period namely, water temperature, salinity, transparency, dissolve oxygen and pH. The relationship of zooplankton with physico-chemical parameters were also measured to observed variation of zooplankton monthly. The findings of the present study will help to improve the management strategies of the brood culture pond.