e - poz 2 - Central Institute of Brackishwater Aquaculture

Pesticide residua in water, #dimcnt md fwnr d V mhnd lakeThe pesticide residue (BHC, Endosulphan) levels in water, sediment, and V.cyprinoides were detected during the post mwoon period 1995. The B. H. C.level was detected in water, which varied from 0.048 to 0.152 pg/l and that insediment from 0.0006 to 0.01 27pg/g. The clam had endosulfan in their tissws @0.366 pg/g. The concentration levels were within the safe limits prescribed forfishery waters.Characteristics of the major groups of benthic faunaN m u : Thew m P~O~O)CII wms or ntmrt~mm belonyng to (tu phylum Nmrtlnea Tho IS on oftlw r.~rrn group of benth~c laund observed from lhe Vembanad lake and th~s IS the f~nl account of nemenlne,from the bdckwatm Thee bnhc group* were prmnl In all warn, showlog In maxlrnurn man blornan Intlw monsoon I39 ndm'l fdlowd by the pre monsoon 132 dm') and thc pat m o m (7 ndrn') Stateon 1ruclvlnm a heavy dcM d agncukurdl dnd @her domert~c warn showed the h~.qhesl numer~cal abundance ofthe fduna (54 ndrn'l whrredr stdtlon 1 l showed thr lower1 12 ndrn'lFamilySpecies1. Tubificidae Auloddlus sp.Aulodrilus remexLimnodrilus hoffmeisteri2. Nereidae Namalycastis indicaDendronereis arborifere3. Naididae Dero sp.Dero coopenHanochaeta sp.