Rukisah Saleh (2015) Growth and production efficiency of early juvenile milkfish (Chanos chanos Forsskal) in different culture systems. Doctoral thesis, Universiti Malaysia Sabah.
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Abstract
Milkfish is one of the most important aquaculture species in Southeast Asia, particularly Indonesia, the Philippines, and Taiwan. The cultivation of milkfish is well-established, although there are problems in the nursery stage, with high occurrence of mortality. Therefore, efforts are required for a sustainable milkfish culture. Factors leading to low survival in the nursery phase stage include water quality, food and feeding, and stocking density. This study is aimed at finding a method for an optimal cultivation system for the mass-production of milkfish juvenile. Four experiments were conducted to achieve the aim. The first experiment was conducted to find out the effects of salinity on the growth and survival of milkfish juvenile. Seven levels of salinities were tested, namely 0, 5, 10, 15, 20, 25, 30 ppt. The result showed that 10 ppt is the optimum salinity levels. The mean body weight, weight gain (WG), Average Daily Gain (ADG), Specific Growth Rate (SGR) were 73.6 mg, 72.8 mg, 1.5 mg/f/day, 9.56%/day, respectively. There were significant differences (P<0.05) than those in the other salinity. The second experiment was conducted to find out the effects of AquamatsTM on growth and survival rate. In this experiment, two methods were used, namely recirculating system with and without AquamatsTM as well as a daily water exchange system with and without AquamatsTM. Throughout the experiment, the optimum salinity level recorded was 10 ppt. The result showed that juveniles kept in a recirculation system tank plus AquamatsTM revealed good growth. Average mean body weight, WG, SGR, FCR were 58.83 mg, 51.50 mg/fish/day, 9.99%/day, 83.07%, respectively. The third experiment was conducted to find out the effects of stocking rate on growth, survival and RNA/DNA ratio of juvenile milkfish. In this experiment, juvenile milkfish were reared in a recirculating system plus AquamatsTM with different stocking rates, namely 8, 12, 16, and 20 juvenile/liter. The result showed growth performance and comparison of RNA/DNA ratio with no significant difference (P>0.05) in 8, 12, and 16 juvenile/liter, and with significant difference (P<0.05) with 20 juvenile/liter of density. The final experiment was conducted to find out the survival and growth of milkfish juvenile cultured under different feeding frequencies. In this experiment four treatments were used, namely one time feeding/days, two time, three time and four time feeding per day. The result showed that juveniles maintained with three time feeding per day exhibited best growth performance. The ADG, SGR and SR were 1.36 mg/fish/day, 9.47%/day and 97.78%, respectively. Based on the results obtained in the present study, the milkfish juvenile reared in salinity 10 ppt, using AquamatsTM, stocking density 16 tails per liter and three time feeding per day could be concluded as an optimal condition to develop technique for milkfish aquaculture.
| Item Type: | Thesis (Doctoral) |
|---|---|
| Keyword: | Chanos chanos , Recirculating, Culture system, Rearing technique, Growth, Survival, Salinity |
| Subjects: | S Agriculture > SH Aquaculture. Fisheries. Angling > SH1-691 Aquaculture. Fisheries. Angling > SH20.3-191 Aquaculture > SH151-179 Fish culture |
| Department: | INSTITUTE > Borneo Marine Research Institute |
| Depositing User: | DG MASNIAH AHMAD - |
| Date Deposited: | 13 Aug 2024 08:45 |
| Last Modified: | 13 Aug 2024 08:45 |
| URI: | https://eprints.ums.edu.my/id/eprint/39487 |
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