Study of the aquaculture of Pacific white legged prawn and comparison of its economical efficiency with Indian white prawn.

Increasing of biodiversity and reduction of production costs and alo increasing of shrimp production are the main elements of production security and continuation of aquaculture of shrimp in the country. The hypothesis of this study is made on the basis of aquaculture of pacific white legged prawn , litopenaeus vannamei, and that is economically better than Indian white prawn in bushehr area . This study was carried out with the objectives of determination of bionormatives of pacific white legget prawn and yield estimation per squar meter and has been compared with Indian white prawn. During 1384-85. In this study , the field operations were carried out after primary preparation and water enrichment with the juvenile prawn (pL 15) with 20 prawn per squar meter in the 3 ponds . During the study the phisico-chemical parameters such as water temperature, ocsysion, pH,two times per day , in the morning and evening and salinity , transpiration and depth water , only one time in a day were measured .The health of prawns and also sampling for the calculation of body weight were carried out in every 10 days . Feeding in the first month was randomly and after that was being continued based on the mean of the body weight. The results of this study have showed that the growth of this species is very fast so that during 90 days with the capacity of 20 prawns per squar , meter, it can be reached to 19.59 gr body weight with the growth rate of 0.217 gr . The mean of total production was 2737.5 kg per hectar with FCR=1 . During this study the salinity from 33 ppt to 54 ppt , water temperature from 24.3°c to 35.2°c , occsysion from 2.4 to 11.89 mg/l , pH from 7.83 to 9.01 , transparency from 35 cm to 90 cm and water depth from 100cm to 145 cm were measured and recorded . In the second year, the comparison of growth rate of white legged prawn and Indian white prawn was carried out in the four ponds. The results of this study showed that during 110 days. White legged prawns was reached to average of body weight 14.66 gr and Indian white shrimp, reached to 10.75 gr. The economical assessment showed that white legged prawn has an economical advantage around 2.59 times during 110 days with the capacity of 35 prawns per hectar.