03492cas a2200241 a 450000500170000000800410001703500150005810000220007324500910009526000520018630000110023849000270024950001450027650200570042152023810047865000190285970000410287870000440291970000570296371001060302081000590312685600650318520260818094936.0111005s1990    th uu|m rtt   0|  a1eng d  a.b106903471 aNietes, Arlene D.14aThe effect of feedtypes/forms on the growth and quality of Penaeus monodon post-larvae  aBangkok :bAsian Institute of Technology,c1990  a122 p.1 aThesis ;vno. AE-90-32  aA thesis submitted in partial fulfillment requirements for the degree of Master of Science, School of Environment, Resources and Development  aThesis (M.Sc.) - Asian Institute of Technology, 1990  aGood post- larval shrimp quality is critical  grow-out operations. Nutrition and water quality  during larval and post- larval rearing are generally  by shrimp farmers to be the most important factors  the quality of post-larvae.  to shrimp  conditions  considered  affecting  This study was conducted to: a) assess the most effective  combination of feed types commonly used in commercial  nurseries for Penaeus monodon; b) devise a practical method to  test post-larval quality using a combination of salinity and  temperature stress; and c) identify current constraints to  post-larval production in Thailand through farm surveys.  Two 23- day growth trials were performed to compare  different types of food . Post-larvae were reared in static  glass aquaria containing 30 L sea water (20 ppt) stocked with  30 post-larvae/L. Experiment 1 compared live Artemia nauplii,  Artemia freeze-dried flakes, and formulated feed pellet, as  single and mixed food sources. This revealed that a  combination of live Artemia nauplii (first 8 days at 100  nauplii/post-larvae) and formulated feed pellets (days 9 to 23  at 15% to 25% body weight) gave the best growth. This  combination was chosen as a standard diet for Experiment 2,  which compared green water (Chaetoceros culture and · natural  algae production - outdoor) and clear water systems. Post-larval performance in the outdoor culture system achieved the  highest post-larval growth (66.8 mg and 23.1 mm) and survival  (67%), most efficient apparent food conversion ratio (0.7),  the least presence of metabolites, and the lowest estimated  cost for the production of post-larval shrimps (PL11 to 34).  Stress tests using different combinations of salinity (0,  5, 7.5, 10, 20, 30, 40, 45, and 50 ppt) and temperature (20°C  and 32°C) were conducted to be able to derive a combination  that can give a 60% survival after l hour of exposure. On campus  200 to  found  ppt or  stress tests used 150 post-larvae/test while on - farm,  500 post-larvae were used/test. From the tests it was  that a) 20°C and 10 ppt or 41 ppt, and b) 32°C with 5  40 to 50 ppt, can effect this response .  Application of this simple test on post- larval quality  can eliminate current problems where, on purchasing weak post larvae, farmers subsequently suffer economic losses due to  mortalities after stocking into the grow-out ponds .  0aShrimp culture1 aMachintosh, Donald J., eChairperson1 aLin, Chang Kwei,eExamination Committee1 aKnud-Hansen, Christopher F., eExamination Committee2 aDanish International Development  Agency (DANIDA) - Royal Government  of Denmark, eScholarship Donor2 aAsian Institute of Technology.tThesis ;vno. AE-90-32  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B18265