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Effects of Dietary Arachidonic Acid (20:4n-6) Levels on Growth Performance and Fatty Acid Composition of Juvenile Eel, Anguilla japonica
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Effects of Dietary Arachidonic Acid (20:4n-6) Levels on Growth Performance and Fatty Acid Composition of Juvenile Eel, Anguilla japonica
Bae, Jun-Young; Kim, Dae-Jung; Yoo, Kwang-Yeol; Kim, Sun-Gyu; Lee, Jeong-Yeol; Bai, Sungchul C.;
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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 japonica. 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 ). 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 (). After a conditioning period, fish initially averaging 270.5 g (meanSD) 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 and diets were significantly higher than of fish fed diets (p<0.05). Specific growth rate (SGR) of fish fed the diet was significantly higher than of fish fed diets (p<0.05). However, there were no significant differences in WG, SGR and FE among fish fed diets (p>0.05). Whole body AA deposition of fish fed the 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.
Arachidonic Acid (AA);AA requirement;Essential Fatty Acids;Eel;Anguilla japonica;Growth Performance;
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