Effects of different dietary fatty acids profiles on the growth performance and body composition of juvenile tench (Tinca tinca (L.))

Abstract

Juvenile tench (initial weight of about 57 g) were fed feed supplemented with fish oil (group FO), linseed oil (group LO), peanut oil (group PO), or rapeseed oil (group RO) containing 47% protein and 12% fat for 55 days. The inclusion of the tested oils was 50 g kg -1 (42% total crude lipids in diets). No significant differences were noted in the fish growth performance. The proximate composition of the whole fish bodies and the viscera (water, protein, fat, ash) was similar in all the dietary treatments (P [ 0.05). Differences were noted only with regard to the ash content of the fillets (P \ 0.05). The analysis of the fatty acids profiles of tench (whole fish) indicated there were significant differences in the total content of monoenoic and polyenoic (PUFA) acids. Significant differences were also noted with regard to n-3 PUFA and n-6 PUFA. Consequently, the ratio of n-3/n-6 acids ranged from 1.6 (group PO) to 2.08 (group LO; P \ 0.05). The feed applied was not confirmed to have had an impact on the fatty acids profile of the tench fillets. There was a statistically significant intergroup difference in the content of saturated fatty acids (SFA) in tench viscera. In the fish fed vegetable oils supplemented diets, the level of SFA was lower (P \ 0.05).

Interactive effects of dietary protein level and oil source on proximate composition and fatty acid composition in common carp (Cyprinus carpio L.)

“…Our findings are in agreement with previous studies in cyprinid species (goldfish, Carassius auratus; common carp, C. carpio; grass carp, Ctenopharyngodon idella; tench, Tinca tinca) in which vegetable oils did not affect the chemical composition of these fish over either short or long-term periods (Steffens et al, 1995;Pozernick and Wiegand, 1997;Du et al, 2008;Zakęś et al, 2010). In this study, the changes of protein level in feed showed significant influence on the chemical composition of carp fillets.…”

“…Several studies have shown that total replacement of FO with vegetable oils, including RO in diets of cyprinid fish species, has no negative effects on fish growth and growth parameters (Turchini et al, 2007;Kukačka et al, 2009;Zakęś et al, 2010). In agreement with the previous studies, the present experiment showed no negative effect of total inclusion of RO instead of FO on production parameters and growth of common carp reared in cages under natural atmospheric conditions.…”

“…Thus, the SFA, ARA, EPA, and the total n-3 PUFA were utilised to a higher extent by the fish fed the FO and HP diets compared to the RO and LP groups, as previously reported for cyprinid omnivorous fish species (Pozernick and Wiegand, 1997;Turchini et al, 2007;Kukačka et al 2009;Zakęś et al, 2010;Sun et al, 2011). DHA appeared to be slightly utilised in the FO and HP groups but was stored in the muscle of the RO and LP groups.…”

“…The protein sparing effect has been shown in several studies on common carp (Steffens, 1996;Cho et al, 2001), but an excessive fat accumulation in the fish carcass was observed (Keshavanath et al, 2002). Several studies have examined the replacement of FO with RO or other VO in the diets of cyprinids (Steffens et al, 1995;Pozernick and Wiegand, 1997;Du et al, 2008;Zakęś et al, 2010), and also the use of low protein/high carbohydrates diets (Cho et al, 2001;Khan et al, 2004). However, all the mentioned investigations in common carp were focused either on oil source or on the dietary protein level.…”

Effect of Different Feeding Levels of Plant‐ingredient‐based Feed on Fillet Fatty Acid Profile, Carcass Trait, and Sensory Characteristics of Indian Major Carps in Earthen Pond Polyculture

“…Emphasis is being given on the strategies for lowering the production cost from aquaculture through better utilization of feeds by fish. Similarly, replacement of FO by vegetable oils also did not reduce the performance of some fish species (Zak ȩś et al 2010;Ljubojević et al 2015). Blends of plant protein sources as the FM replacement in fish feeds have been successful to a large extent in several aquaculture species (Gatlin et al 2007;Tacon and Metian 2008;Hardy 2010).…”