Effects of olive pomace on growth performance, digestibility, body composition and fatty acid profile in yearling Siberian sturgeon,Acipenser baerii(Brandt 1896)

Abstract

Replacement of olive pomace (OP) with wheat flour in diet was studied in diet of yearling Siberian sturgeon (Acipenser baerii). Fish (165 ± 6.8 g) were randomly allocated to 15 fibreglass tanks (15 fish/tank, in triplicate). Fish were assigned to one of five dietary treatments at 19.1 ± 1.5°C for 8 weeks: control diet (crude protein and crude lipid at 514.6 and 188 g/kg, respectively) and four experimental diets with 20, 50, 75 and 100 g/kg OP to replace wheat flour in the experimental diets. No significant difference was observed in the final weight, feed conversion ratio, specific growth rate, hepatosomatic index, viscera‐somatic index and survival rate among the treatments (p > 0.05). No change was seen in digestibility of protein and lipid in diets containing 20 g/kg and 50 g/kg OP compared to control group, while these values decreased with increasing in OP above 50 g/kg. Digestibility of dry matter and gross energy among the treatments demonstrated no significant difference (p > 0.05). Polyunsaturated fatty acids, especially C22:6n3 (DHA), in the muscle of the fish fed 75 g/kg and 100 g/kg OP in diets were significantly higher than control group (p < 0.05). These data show that OP could be recommended as a substitute for wheat flour in diet of S. sturgeon but its utilization for other species warranted future works.

Partial replacement of wheat flour and corn meal with olive pomace in diet of rainbow trout (Oncorhynchus mykiss): effects on growth performance, body composition, hematological parameters and sensory evaluation

“…Our results corroborate the finding of a previous research which was conducted on Siberian sturgeon (Banavreh et al, 2019a). Some FAs such as ALA (18:3n-3) and 20:4n-6 increased in the fish received OP, although the diets containing OP exhibited lower levels of ALA compared to the control diet.…”

“…Harmantepe et al (2015) showed that up to 12% olive cake (OC) induced no addvers effects on the growth performance and FCR in juvenile hybrid tilapia (Oreochromis niloticus × Oreochromis aereus). Another supportive research by Banavreh et al (2019a) demonstrated that wheat flour could be replaced with OP up to 100 g/kg diet without no conciderable difference in the final weight, FCR, FI, SGR, and CF between the treated fish and the control group. Blood biochemistry indices reveal the health and nutritional status of fish ( Chen et al, 2018;Dadras et al, 2016).…”

“…(2001) who showed that tannin interfere the binding of minerals. This polyphenolic compound functions as an immunostimulant and antioxidant and thereby improving the immune system (Banavreh et al, 2019b;Cioffi et al, 2010;Dadras et al, 2016;Dal Bosco et al, 2012 (Richard et al, 2006;Richard et al, 2006). suggesting different effect of polyphenols on the immune system of the treated fish.…”

“…Further studies demonstrated that replacement of OP with wheat flour in the diet of yearling Siberian sturgeon (Acipenser baerii) increased the polyunsaturated fatty acid contents (especially C22:6n-3) in the the muscle of the fish recieved 75 g/kg and 100 g/kg OP (Banavreh et al, 2019a) and improved the immunological status of the fish (Banavreh et al, 2019c). Furthermore, OP was utilized as a substitute ingredient for wheat bran in the diet of tilapia (Oreochromis niloticus) and findings suggested the feasibility of up to 25% substitution without compromising the growth performance and feed utilization efficiency (Alasgah et al, 2011).…”

Feasibility of superworm, Zophobas morio , meal as a partial fishmeal replacer in fingerling rainbow trout, Oncorhynchus mykiss , diet: growth performance, amino acid profile, proteolytic enzymes activity and pigmentation

“…The paste was subsequently pelleted via a pelleting machine (die of 2 mm); after that, the semi‐moist mixture was dried in a convection oven (ED115, Binder GmbH, Tuttlingen, Germany) at 50°C for 48 h to reach the moisture value of around 10%. All of the feed were chopped in 3‐mm pellets and stored in airtight bags at −20°C until use (Banavreh et al, 2019). Chromium (III) oxide powder (Cr 2 O 3 ; Sigma‐Aldrich®) was added at 5 g/kg diet for the apparent digestibility of macronutrient measurement.…”