Nursing hybrid catfish fry (female Clarias macrocephalus X male C gariepinus) using flow-through green and clear water systems | |
| Author | Narong Veeravaitaya |
| Call Number | AIT Thesis no. AE-90-28 |
| Subject(s) | Fish-culture Catfishes |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of science, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | Two experiments were conducted to study the effect of green and clear water on growth and survival of hybrid catfish fry(female Clarias macrocephalus x male C, gariepinus) at high stocking densities in flow-through systems. Experiment 1 evaluated the effects of three stocking levels(lOO, 200 and 400 fry/L) on growth, survival and food conversion efficiency of catfish fry. Fry averaging 10.1 mg were nursed 20 days in 18 8-L circular jars(nine for green and nine for clear water systems). The water volume was maintained at 5 L and flow rate at 300 mL/min. The fry were fed ad libitum with artificial feed four times daily. Fry nursed in the green water system were significantly better in growth and food conversion ratio than those in the clear water system . The average final fish weights ranged from 164.5 to 308.1 mg, and the survival rates from 38 to 58% . The best growth and survival rate were attained at a stocking density of 200 fry/L in the green water system. Experiment 2 determined the effect of water exchange rate on growth, survival and feed conversion efficiency in the green water flow-through system . Eighteen circular jars(8L) were stocked with fry(averaging 27.7 mg) in six water exchange rates :0, 69, 138, 208, 277 and 346 mL/min. The fry were stocked at 200 fry/L and fed as in Experiment 1 over 19 days. The average final weights and survival rates ranged from 192.1 to 543.1 mg and 33.1 to 35.6%, respectively . The fry obtained at water exchange rate of 346 mL/min gave the best growth. There were no significant differences in survival among different flow rates(p<0.05). |
| 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) | Lin, Chang Kwei |
| Examination Committee(s) | Edwards, Peter ;Knud-Hansen, Christopher F. |
| Scholarship Donor(s) | Canada International Development agency (CIDA) |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1990 |