Comparing the Effects of Feeding a Fish Oil- or a Cod Liver Oil -Based Diet on Growth, Feed Utilization and Muscle Fatty Acid Composition Nile Tilapia (Oreochromis niloticus)

Year 2018, Volume: 1 Issue: 3, 130 - 142, 28.09.2018

Arzu Özlüer Hunt , Ferbal Özkan Yılmaz , Zeynep Erçen

Abstract

The present study was performed to investigate the influence
of fish oil (FO) and cod liver oil (CLO) as the dietary lipid sources on
the growth performance, feed utilization and fatty acid (FA) composition of Oreochromis niloticus. two isonitrogenous
(38% crude protein), isocaloric (18.9 MJ GE/kg) diets containing 6% of added
fat from the lipid sources were formulated and used. Each diet was fed to
triplicate groups of 17 fish of 18.18 ± 0.02 g mean initial body weight fed
with %3 body weight two times a daily. The tilapia was raised at
         28±1 °C in 6 square
experimental cages (1×1×1.25 m) during the 60 days. Results showed that the
source of added lipid significantly influence (P<0.05)
final body weight, live body weight and daily growth rate but did not affect
specific growth rate, feed conversion ratio and survival, rate of tilapia.
There was no significant difference in the fillet proximate composition of fish
fed the FO or CLO diets, except for fish fed the CLO diet showed lower lipid
deposition (P<0.05). The deposition of
fatty acids in fish tissues was generally influenced by the fatty acid profile
of the diets. Fillet fatty acid profiles of tilapia fed CLO-based diet had
significantly higher concentrations of saturated and monounsaturated fatty
acids, but lower levels of polyunsaturated fatty acids (PUFA) compared to the
fish fed the FO diet. Fillet of fish fed the FO diet had significantly higher
concentrations of DHA (docosahexaenoic acid) compared with fish fed CLO-based
diets (P<0.05). EPA (eicosapentaenoic
acid) did not showed significantly different both diet (P>0.05).
In fish fed FO diet group, both n−3
and n−6 PUFA were the highest when
compared with fish fed with CLO diet. The lipid source not influenced (P<0.05) hepatosomatic index (HSI) and
viscerosomatic index (VSI). However, fish fed CLO contained diet showed
significantly higher liver fat (20.20±0.22) than fish fed FO diet group
(13.88±0.22) (P<0.001).

Keywords

Cod liver oil, Fatty acid composition, Fish oil, Growth oil, EPA/DHA, Oreochromis niloticus

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