| Author | Amechi, Mark |
| Call Number | AIT Thesis no. AE-95-26 |
| Subject(s) | Bycatches (Fisheries)
|
| Note | A Thesis Submitted For Partial Fulfillment of the Requirements For the Degree of
Master of Science, School of Environment, Resources, and Development |
| Publisher | Asian Institute of Technology |
| Abstract | This study focused on the by-catch biomass of four experimental series of fish
ponds (totaling 45 ponds). The study assessed the by-catch biomass of the
experimental ponds, in relation to experimental treatments and also estimated the
amount of input energy assimilated in by-catch biomass.
Treatments were found to have an affect on by-catch biomass in two of the four
experiments. In the first experiment the treatment with urea and TSP fertilizer pond
inputs resulted in the lowest by-catch biomass (38.5 kg) whilst a treatment in which
urea, TSP, plus supplementary feeds were used resulted in the highest by-catch
biomass of (127.7 kg). In the second experiment the control treatment (stocked with
tilapia only at 2 fish m-2) had the highest by-catch biomass of 120.9 kg, whilst the
lowest by-catch biomass of 23. 3 kg was realized in a treatment stocked with tilapia and
common carps at 2 and 0.3 fish m-2, respectively. By-catch from the third and fourth
experiments were not affected by treatments.
Significant quantities of nitrogen and phosphorus inputs were assimilated into
by-catch biomass; by-catch biomass contained 6.05 % and 3.72 % of N and P inputs,
3.52 % and 1.84 % of N and P inputs, 3.34 % and 1.84 % of N and P inputs, and 3.46
% and 2.26 % of N and P inputs for experiments 1 to 4, respectively. Calcium inputs
were not known but quantities of calcium in by-catch biomass of each experiment were
high; experiments 1 to 4 contained 151.5 kg, 91.3 kg, 89.7 kg and 70.7 kg of calcium,
respectively. These high quantities of nutrients may further help unlock the mysteries
of nutrients which cannot be accounted for in pond nutrient budgets. |
| Year | 1995 |
| 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) | Yakupitiyage, Amararatne; |
| Examination Committee(s) | Hambrey, John B.;Lin, Chang Kwei; |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1995 |