DIVERSITY AND SEASONAL OCCURRENCE OF PLANKTONIC ROTIFERS IN KEENJHAR LAKE DISTRICT THATTA SINDH PAKISTAN

Abstract

Qualitative and quantitative Zooplankton sampling was carried out every month
from November 1998 to October 1999 at three stations in Keenjhar Lake. A total of
fifteen rotifer species were identified. Four species belonging to genus Keratella were
K. cochlearis, K. volga, K. cochlearis var. tecta, Keratella tropica and four species
belonging to genus Brachionus were B. falcatus, B.buidapestinensas, B.quadridentatus
and Brubens. The other were Platyias quadriconus, Monostyla sp, Mytilina sp, Lecane
sp, Tetramarti opotiensis, Euchlanis sp and Macrochaetis sp, Keratella and Brachionus
were present through out the year