Effects of different feeding regimes, weaning period and stocking density on survival and growth of spotted Featherback fish fry (Chitala ornata) | |
| Author | Sirisopa Munsiri |
| Call Number | AIT Thesis no.AQ-10-07 |
| Subject(s) | Artificial feeding Chironomus Larvae |
| Note | A thesis submitted in partial fulfillment of the requirements for the D e gr e e of Master of Science in Aquaculture and Aquatic Resources Management, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. AQ-10-07 |
| Abstract | Spotted featherback ( Chitala ornata ) is one of the important captured and cultured food fish in Thailand which can be bred naturally without hormone manipulation. However, farmers use live feed for larval rearing. Inconsistent supply and relatively higher cost of live feed, and long larval rearing period are problematic in larval rearing process. T his study was conducted to develop method for weaning spotted featherback larva from live feed to dry feed. Three experiments were conducted to evaluate the suitable type of live feed , weaning period and optimal stocking densities of rearing, respectively, using 7 - days old fish fry in 50L tanks in a flow through system. Chironomus larvae , Artemia naupli i s and Moina sp. (graded and ungraded) wer e used in the first experiment to select the most promising live feed in terms of larval growth (daily weight gain; DWG) and survival rate (SR). The results indicated that Chironomus larvae was the be st for both growth and survival (DWG as 12.54 ± 0.03 mg. /day and SR as 97 ± 0.86 %) and it was followed by Artemia naupli i s, graded and ungraded Moina , respectively . The second experiment was conducted using mixtures of Chironomus larvae and dry feed to evaluate the potential for weaning from live feed to dr y feed. The % of artificial feed increased gradually to replace Chironomus larvae completely within a defined period. The results showed that fish fry can be weaned easily by increasing dry feed in the feed mixture by every 4 days for 20 days. This treatme nt showed the best growth performance (12.56 ±0.23 mg. /day) and survival rate (86.17 ± 1.20 %). The relationships between the mean final weight (Y 1 ) and survival rate with weaning period (X) were expressed by the following regression equations: Y 1 = 69.34 Ln(X) + 240.04 ( R 2 = 0.96) and Y 2 = 20.344X + 9.16 (R 2 = 0.96). Results of the third experiment showed that growth and survival rate of fish fry reared at a density of 0.5/L was the best (DWG = 87.29 ± 4.05 mg. /day and SR = 87 ± 8.87 %). This was follo wed by stocking densities of 1.0, 1.5 and 2.0/L, respectively. Both growth and survival rate had inverse relationship with stocking density (Y 1 = 2928.3 – 499.56Ln X (R 2 = 0.96) of growth and Y 2 = 86.308 – 18.012Ln X (R 2 = 0.94) for SR). In conclusion, t his study indicated Chironomus larvae was the best among the test ed live feeds for rearing Spotted Featherback Chitala ornata fry until it can be weaned to artificial feed. Weaning period was optimum at feeding acclimatization every 4 days and stocking de nsity 0.5/L could provide the best growth and survival rate for rearing this species until it become fingerling. |
| Year | 2010 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. AQ-10-07 |
| 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 | Aquaculture and Aquatic Resources Management (AQ) |
| Chairperson(s) | Yakupitiyage, Amararatne |
| Examination Committee(s) | Gallardo, Wenresti G.;Thakur, Dhirendra P. |
| Scholarship Donor(s) | RTG Fellowship;CPF Thailand |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 2010 |