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The Optimum Feeding Frequency in Growing Korean Rockfish (Sebastes schlegeli) Rearing at the Temperature of 15°C and 19°C.

Mizanur RM, Bai SC - Asian-australas. J. Anim. Sci. (2014)

Bottom Line: Fish were fed at the rate of 1.2% body weight (BW)/d at 15°C and 1.5% BW/d at 19°C.The results indicate that growing Korean rockfish 92 and 100 g perform better at 15°C than 19°C water temperature.As we expected, current results have indicated that a feeding frequency of 1 meal a day is optimal for the improvement of weight gain in growing Korean rockfish grown from 92 g to 133 g at 15°C and 100 g to 132 g at 19°C water temperature.

View Article: PubMed Central - PubMed

Affiliation: Department of Marine Bio-Materials and Aquaculture/Feeds and Foods Nutrition Research Center, Pukyong National University, Busan 608-737, Korea ; Member of Bangladesh Civil Service (Economic) Cadre, Planning Commission, Ministry of Planning, Dhaka 1207, Bangladesh .

ABSTRACT
Two feeding trials were conducted to determine the optimum feeding frequency in growing Korean rockfish, (Sebastes schlegeli) reared at the temperatures of 15°C and 19°C. Fish averaging 92.2±0.7 g (mean±standard deviation [SD]) at 15.0±0.5°C and 100.2±0.4 g (mean±SD) at 19.0±0.5°C water temperature were randomly distributed into each of 15 indoor tanks containing 250-L sea water from a semi-recirculation system. A total of five feeding frequency groups were set up in three replicates as follows: one meal in a day at 08:00 hour, two meals a day at 08:00 and 17:00 hours, three meals a day at 08:00, 14:00, and 20:00 hours, four meals a day at 08:00, 12:00, 16:00, and 20:00 hours, and one meal every 2 days at 08:00 hour. Fish were fed at the rate of 1.2% body weight (BW)/d at 15°C and 1.5% BW/d at 19°C. At the end of 8 wks of feeding trial weight gain and specific growth rate were significantly higher at the fish fed groups of one meal a day and two meals a day at 15°C and fish fed groups of 1 meal every 2 days at 19°C were significantly lower than those of all other fish fed groups. Glutamic oxaloacetic transaminase and glutamic pyruvic transaminase of fish fed group at 1 meal every 2 days was significantly higher than those of all other fish fed groups in both experiments. Weight gain, specific growth rate and condition factor were gradually decreased as the feeding frequency increased. The results indicate that growing Korean rockfish 92 and 100 g perform better at 15°C than 19°C water temperature. As we expected, current results have indicated that a feeding frequency of 1 meal a day is optimal for the improvement of weight gain in growing Korean rockfish grown from 92 g to 133 g at 15°C and 100 g to 132 g at 19°C water temperature.

No MeSH data available.


Related in: MedlinePlus

Condition factor of rockfish with different feeding frequencies at 15°C and 19°C.
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f2-ajas-27-9-1319: Condition factor of rockfish with different feeding frequencies at 15°C and 19°C.

Mentions: Hepatosomatic index, CSI, and CF may provide the information on growth, physical condition, energy reserves and ability of fish to tolerate the environmental stresses. In a poor, stressful and unfavorable environment, fish usually have a smaller liver which means less energy reserved in the liver. In the present study, morphological indices were significantly affected by feeding frequency. Condition factor, HSI and VSI were significantly higher at the group of 2 meals a day in 15°C and at 1 meal a day group in 19°C. On the other hand, CF and HSI were comparatively higher at 15°C than 19°C experiment (Figure 2; Tables 1 and 3). Condition factor, HSI and VSI were gradually decreased as the increasing of feeding frequency. It might be happened because of environmental pollution due to higher feeding frequency and fish could not able to digest properly all the feeds. Condition factor, HSI, and VSI at 1 meal every 2 days group was significantly lower than other fish fed groups in both experiments. Because, Korean rockfish was might be always hungry and under feeding stressed conditions. Oh et al. (2008) have described that HSI is a good compensatory growth index in juvenile black rockfish. On the other hand, HSI and CF of olive flounder could be indices reflecting the compensatory growth has been indicated by Cho (2012).


The Optimum Feeding Frequency in Growing Korean Rockfish (Sebastes schlegeli) Rearing at the Temperature of 15°C and 19°C.

Mizanur RM, Bai SC - Asian-australas. J. Anim. Sci. (2014)

Condition factor of rockfish with different feeding frequencies at 15°C and 19°C.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4150199&req=5

f2-ajas-27-9-1319: Condition factor of rockfish with different feeding frequencies at 15°C and 19°C.
Mentions: Hepatosomatic index, CSI, and CF may provide the information on growth, physical condition, energy reserves and ability of fish to tolerate the environmental stresses. In a poor, stressful and unfavorable environment, fish usually have a smaller liver which means less energy reserved in the liver. In the present study, morphological indices were significantly affected by feeding frequency. Condition factor, HSI and VSI were significantly higher at the group of 2 meals a day in 15°C and at 1 meal a day group in 19°C. On the other hand, CF and HSI were comparatively higher at 15°C than 19°C experiment (Figure 2; Tables 1 and 3). Condition factor, HSI and VSI were gradually decreased as the increasing of feeding frequency. It might be happened because of environmental pollution due to higher feeding frequency and fish could not able to digest properly all the feeds. Condition factor, HSI, and VSI at 1 meal every 2 days group was significantly lower than other fish fed groups in both experiments. Because, Korean rockfish was might be always hungry and under feeding stressed conditions. Oh et al. (2008) have described that HSI is a good compensatory growth index in juvenile black rockfish. On the other hand, HSI and CF of olive flounder could be indices reflecting the compensatory growth has been indicated by Cho (2012).

Bottom Line: Fish were fed at the rate of 1.2% body weight (BW)/d at 15°C and 1.5% BW/d at 19°C.The results indicate that growing Korean rockfish 92 and 100 g perform better at 15°C than 19°C water temperature.As we expected, current results have indicated that a feeding frequency of 1 meal a day is optimal for the improvement of weight gain in growing Korean rockfish grown from 92 g to 133 g at 15°C and 100 g to 132 g at 19°C water temperature.

View Article: PubMed Central - PubMed

Affiliation: Department of Marine Bio-Materials and Aquaculture/Feeds and Foods Nutrition Research Center, Pukyong National University, Busan 608-737, Korea ; Member of Bangladesh Civil Service (Economic) Cadre, Planning Commission, Ministry of Planning, Dhaka 1207, Bangladesh .

ABSTRACT
Two feeding trials were conducted to determine the optimum feeding frequency in growing Korean rockfish, (Sebastes schlegeli) reared at the temperatures of 15°C and 19°C. Fish averaging 92.2±0.7 g (mean±standard deviation [SD]) at 15.0±0.5°C and 100.2±0.4 g (mean±SD) at 19.0±0.5°C water temperature were randomly distributed into each of 15 indoor tanks containing 250-L sea water from a semi-recirculation system. A total of five feeding frequency groups were set up in three replicates as follows: one meal in a day at 08:00 hour, two meals a day at 08:00 and 17:00 hours, three meals a day at 08:00, 14:00, and 20:00 hours, four meals a day at 08:00, 12:00, 16:00, and 20:00 hours, and one meal every 2 days at 08:00 hour. Fish were fed at the rate of 1.2% body weight (BW)/d at 15°C and 1.5% BW/d at 19°C. At the end of 8 wks of feeding trial weight gain and specific growth rate were significantly higher at the fish fed groups of one meal a day and two meals a day at 15°C and fish fed groups of 1 meal every 2 days at 19°C were significantly lower than those of all other fish fed groups. Glutamic oxaloacetic transaminase and glutamic pyruvic transaminase of fish fed group at 1 meal every 2 days was significantly higher than those of all other fish fed groups in both experiments. Weight gain, specific growth rate and condition factor were gradually decreased as the feeding frequency increased. The results indicate that growing Korean rockfish 92 and 100 g perform better at 15°C than 19°C water temperature. As we expected, current results have indicated that a feeding frequency of 1 meal a day is optimal for the improvement of weight gain in growing Korean rockfish grown from 92 g to 133 g at 15°C and 100 g to 132 g at 19°C water temperature.

No MeSH data available.


Related in: MedlinePlus