Author(s): Suresh Babu Ch and Shailender M
The present study was conducted for the effects of temperature and salinity on the hatching success, survival and development of the larval stages of Penaeus monodon were investigated under five temperatures (24, 26, 28, 30 and 320C) and four salinities (25, 30, 35 and 40 ppt). Best percentage of hatch was obtained at 33oC and 35 ppt (87%) followed by 290C and 35 ppt (82%). Similarly during naupliar stages, high survival rate was obtained at 330C and 35 ppt (89%). Metamorphosis cycle during theprotozoeal stages (protozoea 1 to postlarva 1) was extended and survival rate decreased at 25 ppt. Development to PL1 was faster at 330C (7–8days) as compared to 290C (8–10 days) regardless of the salinity levels. Maximum survival during the protozoealstages was at 35 ppt followed by 48% at 330C and 45% at 290C. Results showed that salinity exerted a greaterinfluence than temperature on the survival and development of larvae. Based on the results, the best temperature–salinity combination for larval survival and metamorphosis of P. monodon is 330 C and 35 ppt. A salinity range of 30–35 ppt is ideal for larval development.