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Poultry and Laboratory Animal Nutrition
Asian-Australasian Journal of Animal Sciences 2010;23(4): 508-514.
https://doi.org/10.5713/ajas.2010.90491    Published online February 22, 2010.
Effects of Dietary Arachidonic Acid (20:4n-6) Levels on Growth Performance and Fatty Acid Composition of Juvenile Eel, Anguilla japonica
Jun-Young Bae, Dae-Jung Kim, Kwang-Yeol Yoo, Sun-Gyu Kim, Jeong-Yeol Lee, Sungchul C. Bai
Abstract
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 iso-nitrogenous 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 (AA0.07, AA0.22, AA0.43, AA0.57, AA0.78 or AA1.23). 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 AA1.23 diets were significantly higher than of fish fed AA0.07, AA0.22 and AA0.43 diets (p<0.05). Specific growth rate (SGR) of fish fed the AA0.78 diet was significantly higher than of fish fed AA0.07, AA0.22 and AA0.43 diets (p<0.05). However, there were no significant differences in WG, SGR and FE among fish fed AA0.57, AA0.78 and AA1.23 diets (p>0.05). Whole body AA deposition of fish fed the AA1.23 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.
Keywords: Arachidonic Acid (AA); AA requirement; Essential Fatty Acids; Eel; Anguilla japonica; Growth Performance


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