Shrimps and Pistal srimps

Nine species of brackish water lake inhabiting shrimps were identified from Pulicat. They are Penaeus indicus, Penaeus monodon, Penaeus semisulcatus, Penaeus merquiensis, Macrobrachium rosenbergii, Metapenaeus offinis, Metapenaeus dobsoni, Metapenaeus monoceros, Penaeus latisulcatus. There are two pistol shrimps were identified in Pulicat. All have been inhabited in dead oyster shell. They are Alpheus malabaricus, Alpheus heterochelis. Density of pistol shrimps varied from 3 to 7 no/sq.m in station 1. Higher density was noticed in sampling site 4 whereas lower density was found in 2 and 6. The pistol shrimps were varied in number from 2 to 9 No /sq. meter. Higher density was noticed in sampling site 1 whereas lower density number encounted in Site 2 and site 8. The pistol shrimps were varied in number from 2 to 8 /sq. meter. Higher density was noticed in sampling site 10 whereas lower density number encounted in Site 9. Weight of the pistol shrimp in different stations was shown that maximum growth rate was noticed in station 2 and lesser in St 2 (site 8) and St 3 (site 9). Density and weight of the oysters were high correlation with each other in terms of spatial contribution. Weight of the oysters were varied from 380 to 1650 grams in three sampling stations. The oysters in lowest weight was observed in station 3 and in site 9 whereas highest weight of the oyster was noticed in station 2 and in site 1.The density of oyster was observed to be varied from 2 to 9 No/ sq. m. lesser number of oysters were found in station 1 in site1, station 2 in site 7 and station 3 in site 8. Variation of temperature, Salinity and pH from 30 to 33 ^OC,  31 to 35ppt and 7.5 to 8.2