The Baybay, Lurraine H. creator Machintosh, Donald J. Chairperson Lin, Chang Kwei Examination Committee Little, David C. Examination Committee The United Kingdom Scholarship Donor text series technical report th Bangkok Asian Institute of Technology 1989 continuing eng 97 p. In an attempt to understand the role of temperature and salinity on the survival, tolerance, behaviour and growth of Penaeus monodon postlarvae, 72- hour static water survival tests and a 3-week growth trial were conducted. On- farm observations were also made in a commercial hatchery to aid in assessing relationships between production techniques and postlarval quality. It has been found that in general, ~ monodon postlarvae, age PL.2o to PL.4o possess broad tolerance to salinity from 5-40 ppt and to temperature in the range 20- 36 "C. Results al so revealed that a 48- hour acclimation to low (10 ppt ) and high ( 36 ppt ) salinity can extend the tolerance range to 5 - 50 ppt and postpone time to 1 ethal doses ( LD!i o ) in concentratians beyond the range of tolerance i . e. 0 , 2 and 55 ppt. Specific combinations of salinity and temperature showed strong influence of temperature on postlarval salinity tolerance . Extreme levels of temperature ( 20-22"C and 37-39°C) served to narrow the salinity tolerance range and accelerate time to LD5o. Moreover, temperature at a maintained salinity in the range of 20- 36 ppt showed a more distinct effect on survival and growth than salinity changes at a particular temperature . A combination of low salinity ( 20 ppt) and high temperature ( 34- 36 °c) promoted the fastest growth with a weight gain of 117 mgs and the best food utilization. However, a combination of low salinity ( 20 ppt ) and 10111 temperature (28- 30°C) appeared best for survival. A thesis submittted in partial fulfillment of the requirements for the degree of Master of Science, School of Environment, Resources and Development Thesis (M.Sc.) - Asian Institute of Technology, 1989 Shrimp culture Asian Institute of Technology. http://203.159.5.9/ait-thesis/detail.php?q=B17895 http://203.159.5.9/ait-thesis/detail.php?q=B17895 110920 20260818095114.0