|
Abstract
|
A 56-day nutritional research was performed to examine the influence of alternative
vegetal protein and lipid sources on performance of yellowfin seabream fry
(Acanthopagrus latus) (0.5 ± 0.0 g). In this regard, five isoproteic (Ca. 500 g/kg) and
isolipidic (Ca. 150 g/kg) diets were formulated in which fish meal (FM) and fish oil
(FO) were simultaneously replaced with blends of plant proteins (PP, soybean meal
and corn gluten) and vegetal oils (VO, canola and soybean oils) at 20% (SR20), 40%
(SR40), 60% (SR40) and 80% (SR80) levels, respectively; meanwhile, a control diet
(SR0) was formulated based on FM and FO. Growth and feed utilization were not
influenced by experimental diets. The fatty acid profile of fillet drastically altered
by dietary treatments. Fish fed with the SR60 and SR80 feeds had higher total protease,
trypsin and ?-amylase activities than other treatments. The antioxidant enzyme
activities and glutathione content in liver were enhanced in fish fed with the
SR40, SR60 and SR80 diets. Skin mucosal immune parameters including total protein
content, alkaline phosphatase and alternative complement pathway activities in the
control group were relatively lower than the vegetal treatments. According to these
results, it is recommended that 410 g/kg of FM and 45 g of FO/kg can be replaced
with alternative vegetal sources in diet for A. latus fry.
|