00273    a2200109   4500020001500000082001600015100001800031245004200049260003900091300002100130650001200151  a8170352924  a591.77bKUM  aKumar, Arvind  aEcology and ethology of aquatic biota  aDelhibDaya Publishingc2002g2002  axvii,490p.c25cm  aECOLOGY