| Author | Vorathep Mathuwan |
| Call Number | AIT Thesis no. AE-91-40 |
| Subject(s) | Shrimp culture
|
| Note | A Thesis submitted in partial fulfillment of the requirements for
the degree of Master of science |
| Publisher | Asian Institute of Technology |
| Abstract | Budgets for water, nitrogen and phosphorus were estimated
and water quality fluctuations were determined in three intensive
shrimp grow-out ponds over an entire grow-out period. The ponds
were stocked with tiger shrimp (Penaeus monodon) and pond waters
were changed every other day at a rate of 10 to 30 % from stocking
to harvest to maintain good water quality. The relevant water
quality parameters of pond water was determined weekly, Inf low
and discharged water were collected for analysis in each water
change. All inputs and outputs of nitrogen and phosphorus were
measured when these nutrients were added or removed from the
ponds.
The concentration of nutrients in pond water increased with
time, Most of nutrients derived from feed input are incorporated
in suspended particles of which phytoplankton is dominant. About
27.1 - 31.5 % of total nitrogen content in feed was convert by
shrimp, the remainder reaches the ponds as uneaten feed, faces
or excreted matter. About 4 5 % of total nitrogen inputs were
transported out of the ponds by periodical water discharge. Less
than 0.2 % of total nitrogen inputs was found in the sediments. A
large amount unaccounted nitrogen was presumably lost through
denitrification and ammonia volatilization.
Only 8.2 to 9.7 % of phosphorus in feed was convert by
shrimp, the remainder was distributed among other compartments of
the culture system. About 24.3 to 27.3 % of total phosphorus
inputs were discharged as waste materials from the ponds. Large
amounts of phosphorus, ranging from 61.9 to 66.6 % of total phosphorus
inputs, were lost or accumulated in the ponds.
Weekly pond water samples were collected for water quality
a n a lysis. Dissolved nutrients (total ammonia nitrogen, nitrate-nitrite-nitrogen,
nitrite-nitrogen and soluble reactive phosphorus)
in pond water never exceeded 0.01 mg/L over an entire grow out
period. Total nitrogen, total phosphorus and total suspended
solids concentrations increased with time of grow-out period
progressed. The concentrations of these variables ranged from 0.2
to 1.3 mg/L, 0.05 to 0.29 mg/Land 7.8 to 114 mg/L for total
nitrogen, total phosphorus and total suspended solids respectively. |
| Year | 1991 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB)) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Lin, Chang Kwei; |
| Examination Committee(s) | Knud-Hansen, Christopher F.;Yakupitiyage, Amararatne; |
| Scholarship Donor(s) | Government of Netherlands; |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1991 |