Effect of replacing dietary fish oil with soybean oil on growth performance, fatty acid composition and haematological parameters of juvenile meagre,Argyrosomus regius

Abstract

A nutrition trial with meagre, Argyrosomus regius was assessed to determine the effect of dietary replacement of fish oil (FO) by soybean oil (SO) on the growth, feed utilization, body composition, fatty acid composition and basic haematological parameters. Six isonitrogenous (47% crude protein) and isoenergetic (gross energy 22 kJ/g) experimental diets were formulated by replacing 0 (FO), 20 (S20), 40 (S40), 60 (S60), 80 (S80) and 100 (S100) % of the FO with SO. Fish were fed three times daily to near satiation for 14 weeks. The specific growth rate (SGR) of fish fed S100 diet was significantly lower than the other treatments, except SO80 diet. The fish fed SO100 diet displayed significantly higher feed conversion ratio than that of other diets (P < 0.05). It was observed that fish fed the SO100 and SO80 diets displayed haemoglobin (HGB) levels significantly lower (P < 0.05) than fish fed the SO20 diet. Packed cell volume (PCV) of fish fed SO20 diet was significantly higher compared to SO100. The white blood cell (WBC) and red blood cell (RBC) remained unaffected by dietary treatment. The docosahexaenoic acid (22:6n-3, DHA) and eicosapentaenoic acid (20:5n-3, EPA) levels of meagre were significantly reduced by the substituting of dietary SO by FO at the end of the feeding period. The level of linoleic acid (18:2n-6, LA) and linolenic acid (18:3n-3, LNA) significantly raised in fish fed with SO diets (P < 0.05). The results of this study showed that SO could be replaced FO up to 80% in meagre diet without negative effect on growth performance and basic haematological parameters. Furthermore, the maximum level of FO replacement with SO determined by second order polynomial regression analysis, was 30.1% on the basis of maximum SGR.

Effects of dietary vegetable oil on growth performance, digestive capacity, antioxidant capacity and expression of immune‐related genes in the hybrid grouper (Epinephelus fuscoguttatus♀ ×E. lanceolatus♂)

“…These results are in agreement with earlier studies of the effects of 100% VO replacement in different fish species (Emre, Kurtoğlu, Emre, Güroy, & Güroy, 2016;Li, Lin, Lin, Chen, & Guan, 2016;Liu et al, 2018;Montero et al, 2010). VOs are unique lipid sources, and fish have low capacity to convert C18:2n-6 (LA) and C18:3n-3 (ALA)…”

Dietary Linseed Oil Reduces Growth While Differentially Impacting LC‐PUFA Synthesis and Accretion into Tissues in Eurasian Perch (Perca fluviatilis)

“…To test these possible nutritional influences, studies have investigated plant oil sources at different dietary levels in order to evaluate the consequences on fish growth performance and physiology. In anadromous Atlantic salmon [17,18] and freshwater species including rainbow trout (Oncorhynchus mykiss) [19], Arctic charr (Salvelinus alpinus) [18], swordtail (Xiphophorus helleri) [20], zebrafish [21], African catfish (Clarias gariepinus) [22] and common carp (Cyprinus carpio) [23], the use of diets with 100 % plant oil did not affect growth performance. Interestingly, similar results on growth performance were observed in the marine species Senegalese sole [24] that was fed a plant oil-based diet.…”

The effects of dietary protein levels with amino acid supplementation on the growth performance, haematological profile and histology of meagre (Argyrosomus regius) in two different size classes

“…The production capacity of meagre in these countries has been expanded gradually from 30 tons in 1997 to 14,384 tons in 2011 (FAO ). However, the amount of information available relating nutritional requirements of this important species is quiet new and still need to be addressed (Chatzifotis, Panagiotidou & Divanach, ; Emre et al., ; Estévez et al., ; Ribeiro et al., ; Saavedra et al., ).…”