Effect of different salinities on Survival of Freshwater Prawn (Macrobrachium rosenbergii) Larvae at Seed Production Unit Hawksbay Karachi -Pakistan
Journal Title: International Journal of Interdisciplinary and Multidisciplinary Studies (IJIMS) - Year 2015, Vol 2, Issue 5
Abstract
Present study conducted to observe the effect of different salinities on survival of freshwater prawn (Macrobrachium rosenbergii) larvae. The hatched larvae were kept in different salinities (8, 10 and 12 ppt) during rearing period. Survival rate at larval stage were 50.83 %, 8.93 % and 0.83 % on 12, 10, 8 ppt respectively which is significantly different from each other (P>0.05). Survival rate at Post larval stages were 34.42 %, 20 % and 7.46 % on 12, 8 and 10 ppt respectively which is also significantly different from each other (P>0.05). The larval cycle completed within 36 to 40 days. Water quality parameters recorded throughout the study period were found within the tolerable ranges for freshwater prawn larvae and post larvae such as mean temperature 33.2±0.14°C, mean dissolved oxygen 7.5±0.05 mg/L, pH 8.0±0.06, ammonia from 0.12 ± 0.01 mg/L, hardness 145 ± 1.4 mg/L and nitrite 0.125 ± 0.01 mg/L. These results show that 12 ppt salinity is better for larval to post larval stages than post larvae converted slowly and gradually on 0 ppt.
Authors and Affiliations
Mansoor Zafar, Muhammad Hanif Soomro, Abdul Malik Daudpota, Abdul Jabbar Memon, Athar Mian Ishaqi
Keywords
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