Chungnam Fisheries Institute

South Korea

Chungnam Fisheries Institute

South Korea
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Bae J.-Y.,Pukyong National University | Kim D.-J.,South Korean National Fisheries Research and Development Institute | Yoo K.-Y.,Chungnam Fisheries Institute | Kim S.-G.,Kunsan National University | And 2 more authors.
Asian-Australasian Journal of Animal Sciences | Year: 2010

This study was conducted to evaluate the effects of dietary arachidonic acid (AA, 20:4n-6) levels on growth performance and body composition in juvenile eel, Anguilla japónica. Six semi-purified experimental diets were formulated to be isonitrogenous and iso-caloric containing 55.0% crude protein and 15% crude lipid (18.3 kJ of available energy g-1). Six different levels of AA were added to the basal diet, with 0, 0.2, 0.4, 0.6, 0.8 or 1.2% on a dry matter (DM) basis, respectively (AA007, AA0.22, AA043, AA0.57, AA078 or AA123). After a conditioning period, fish initially averaging 27±0.5 g (mean±SD) were randomly distributed into each aquarium as triplicate groups of 20 fish each. One of six experimental diets was fed on a DM basis to fish in three randomly selected aquaria at a rate of 2-3% of total body weight twice a day. At the end of the 12-week feeding trial, weight gain (WG) and feed efficiency (FE) of fish fed AA0.78 and AA123 diets were significantly higher than of fish fed AA0.07, AA0.22 and AA043 diets (p<0.05). Specific growth rate (SGR) of fish fed the AA0.78 diet was significantly higher than of fish fed AA 0.07, AA022 and AA043 diets (p<0.05). However, there were no significant differences in WG, SGR and FE among fish fed AA0.57, AA0.78 and AA123 diets (p>0.05). Whole body AA deposition of fish fed the AA123 diet was significantly higher than for the other diets (p<0.05). Broken-line model analysis on the basis of WG and SGR indicated that the dietary AA requirement could be greater than 0.69% but less than 0.71% of the diet in juvenile eel. The growth-promoting activity of AA observed in the present study provides strong support for the contention that dietary AA is essential for juvenile eel.


Bae J.-Y.,Pukyong National University | Park G.H.,Pukyong National University | Yoo K.-Y.,Chungnam Fisheries Institute | Lee J.-Y.,Kunsan National University | And 2 more authors.
Journal of Applied Ichthyology | Year: 2013

The study aimed at evaluating the optimum dietary vitamin E requirements using DL-α-tocopheryl acetate in the juvenile eel, Anguilla japonica, as assessed by fish growth performance and fish body composition. Five semi-purified experimental diets were formulated to contain 0 (TA1), 15 (TA17), 30 (TA32), 60 (TA62) and 120 (TA119 mg TA kg-1 diet on a dry matter (DM) basis in the form of DL-α-tocopheryl acetate (TA). After a 4-week conditioning period, fish (15 ± 0.3 g) were randomly distributed into aquaria in groups of 20 at 25 ± 1.0°C (mean ± SD). One of the five diets was fed on a DM basis to fish in three randomly selected aquaria twice daily to satiation (approximately 3% of wet body weight per day at the beginning and 2% of wet body weight per day at the end of the feeding trial) for 12 weeks. At the end of the 12-week feeding trial, weight gain (WG), specific growth rate (SGR), feed efficiency (FE) and protein efficiency ratio (PER) were determined; these were significantly lower in control fish than in fish fed supplemented diets (P < 0.05). The values for fish fed TA17 were significantly higher than for fish fed TA1, TA62 or TA119 (P < 0.05). There were no significant differences in WG, FE or PER among fish that were fed TA17 and TA32, among those that were fed TA32 and TA62, and among those that were fed TA62 and TA119 (P > 0.05). There were also no significant differences in SGR among fish fed TA32, TA62 or TA119 (P > 0.05). A broken-line regression analysis on the basis of WG, SGR, FE and PER showed that dietary vitamin E requirements of juvenile eels were 21.2, 21.6, 21.2 and 21.5 (mg kg-1 diet), respectively. These results indicate that the dietary vitamin E requirement could be <21.2 mg kg-1 but <21.6 mg kg-1 diet in juvenile eel, A. japonica, when DL-α-tocopheryl acetate is used as the dietary vitamin E source. © 2012 Blackwell Verlag GmbH.


Bae J.-Y.,Pukyong National University | Bae J.-Y.,South Korean National Fisheries Research and Development Institute | Park G.-H.,Pukyong National University | Yoo K.-Y.,Chungnam Fisheries Institute | And 3 more authors.
Asian-Australasian Journal of Animal Sciences | Year: 2012

This study was conducted to re-evaluate the dietary vitamin C requirement in juvenile eel, Anguilla japonica by using L-ascorbyl-2-monophosphate (AMP) as the vitamin C source. Five semi-purified experimental diets were formulated to contain 0 (AMP 0), 30 (AMP 24), 60 (AMP 52), 120 (AMP 108) and 1,200 (AMP 1137) mg AMP kg -1 diet on a dry matter basis. Casein and defatted fish meal were used as the main protein sources in the semi-purified experimental diets. After a 4-week conditioning period, fish initially averaging 15±0.3 g (mean±SD) were randomly distributed to each aquarium as triplicate groups of 20 fish each. One of five experimental diets was fed on a DM basis to fish in three randomly selected aquaria, at a rate of 3% of total body weight, twice a day. At the end of the feeding trial, weight gain (WG) and specific growth rate (SGR) for fish fed AMP 52 and AMP 108 were significantly higher than those recorded for fish fed the control diet (p<0.05). Similarly, feed efficiency (FE) and protein efficiency ratio (PER) for fish fed AMP52 were significantly higher than those for fish fed the control diet (p<0.05). Broken-line regression analysis on the basis of WG, SGR, FE and PER showed dietary vitamin C requirements of juvenile eel to be 41.1, 41.2, 43.9 and 43.1 (mg kg -1 diet), respectively. These results indicated that the dietary vitamin C requirement could range from 41.1 to 43.9 mg kg -1 diet in juvenile eel when L-ascorbyl-2-monophosphate was used as the dietary source of vitamin C.


Okorie O.E.,Pukyong National University | Ko S.H.,Pukyong National University | Go S.,Pukyong National University | Bae J.-Y.,Pukyong National University | And 4 more authors.
Journal of the World Aquaculture Society | Year: 2011

A 14-wk feeding trial was carried out to evaluate the optimum dietary riboflavin (vitamin B 2) level in juvenile sea cucumber, Apostichopus japonicus. A total of 360 sea cucumbers averaging 1.49 ± 0.07 g (mean ± SD) were randomly distributed into 18 rectangular plastic tanks, and each tank was then randomly assigned to one of three replicates of six diets containing 0.29 (B 20), 4.22 (B 24), 8.93 (B 29), 17.9 (B 218), 56.7 (B 257), and 577 (B 2577) mg riboflavin/kg diet. At the end of 14 wk of feeding trial, average weight gain (WG) of sea cucumbers fed B 29, B 218, B 257, and B 2577 diets were significantly (P < 0.05) higher than that of animals fed B 20 diet. WG of sea cucumbers fed B 218, B 257, and B 2577 diets were significantly higher than those of animals fed B 20 and B 24 diets. Specific growth rate of sea cucumbers fed B 29, B 218, B 257, and B 2577 diets were significantly higher than those of animals fed B 20 and B 24 diets. Feed efficiency of sea cucumbers fed B 29, B 257, and B 2577 diets were significantly higher than those of animals fed B 20 and B 24 diets. Although significant differences were recorded in proximate composition of sea cucumbers fed the experimental diets, no clear trends were observed. The ANOVA test suggested that the optimum dietary riboflavin level in sea cucumber could be 17.9 mg/kg diet but broken-line analysis of WG indicated a level of 9.73 mg riboflavin/kg diet. Therefore, these results may indicate that the optimum dietary riboflavin level in sea cucumber could be higher than 9.73 mg/kg diet but lower than 17.9 mg/kg diet. © by the World Aquaculture Society 2011.

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