| Author | Dhali, Abdur Rashid |
| Call Number | AIT Thesis no. AE-92-31 |
| Subject(s) | Fishes--Feeding and feeds
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of the Master of Science, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | Two experiments were carried out in 200 m2 static water
earthen ponds to evaluate the value of supplementary feed and
assess to economic benefit for Nile tilapia ( Oreochomis
nilloticus) with fish of 25 a nd 100 g fishes. Thirty six h a pas
were set up in 3 ponds at stocking density 2, 4, 6, 8, 10 and 12
fish/m2 ) with and without feeding treatment. Ponds were
fertilized with chemical fertilzers, urea (0.4 gram/m2 / d ay) and
triple super phosphate (0. 2 gram/m2 / day). Fish in the feeding
treatment were given pelleted feed, ( 20 % protein) ad libitum~
twice daily.
Net yield per ( 5 m2 ) hapa permonthin creased and individual body weight decreased with stocking densities. Individual body
weight of supplementary feeding fishes was hi g her than non fed
treatments. Highest extrapolated yields was 98 . 7 and 49.3
ton/hectare/year at a density 12 fish/m2 in feeding and non
feeding treatments respectively. Food conversion ratio (FCR)
decreased with stocking density. Lowest FCR was 1.55 in large
fishes with stocking density 12/fish/m2 • Average survival rate
was 95% but the survival rate was higher in small fishes.
Feeding standards for small and large fishes were analysed
by regress ion. Net yield (g /hapa) had linear relation with feed
intake (g/hapa). Feeding standards involved several factors such
as natural food, supplemental feed and water quality . So, feeding
standard will be applicable in similar condition. All treatments
of without supplementary feeding were profitable but treatments
at 1 2 fish/m2 gave the highest net yield a nd income.
Supplementary feed was profitable in large fishes (100-200 g)in
at high density > 6 fish/m2 but high density (12 fish/m2 ) was
the most economic (5635 ~/ha/year). |
| Year | 1992 |
| 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) | Edwards, Peter ;Little, David C.
|
| Scholarship Donor(s) | The British council. ; |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1992 |