| Author | Nietes, Arlene D |
| Call Number | AIT Thesis no. AE-90-32 |
| Subject(s) | Shrimp culture
|
| Note | A thesis submitted in partial fulfillment requirements for the degree of Master of Science, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | Good 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 .
|
| Year | 1990 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Machintosh, Donald J.
|
| Examination Committee(s) | Lin, Chang Kwei ;Knud-Hansen, Christopher F.
|
| Scholarship Donor(s) | Danish International Development
Agency (DANIDA) - Royal Government
of Denmark |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1990 |