Effect of dietary fish oil replacement with palm oil on growth performance, hematology and liver anti-oxidative enzymes of juvenile Japanese flounder Paralichthys olivaceus (Temminck & Schlegel, 1846)

Abstract

Summary A 60‐day feeding trial was conducted to evaluate the effects of dietary palm oil supplements on growth performances, hematology, liver anti‐oxidative enzymes and air exposure resistance of Japanese flounder, Paralichthys olivaceus (initial weights 2.56 ± 0.01 g). Five diets were tested wherein the dietary fish oil was replaced by palm oil at: 0% (Control), 20% (20%), 40% (40%), 50% (50%) and 60% (60%). After the feeding trial, the 20% dietary palm oil was shown to provide similar growth rates and feed efficiency with no negative effects compared to the control group (P > 0.05). Significantly lower growth rates and feed utilization were found in fish fed higher than 40% palm oil in the diet (P < 0.05). Except for total serum protein, the blood parameters, liver anti‐oxidative enzymes, stress resistance and proximate compositions of Japanese flounder were not altered, even with dietary palm oil up to 60% of the lipid source (P > 0.05). According to the present results, palm oil is a valuable lipid source substitute in Japanese flounder diets; around 20–40% fish oil can be replaced with palm oil with no negative effects.

Growth, enzymatic glutathione peroxidase activity and biochemical status of juvenile barramundi (Lates calcarifer) fed dietary fermented lupin meal supplemented with organic selenium

“…Plasma TP was used as a fundamental indicator of physiological condition and health status of juvenile barramundi, in accordance with data reported for other species (Al‐Dohail, Hashim & Aliyu‐Paiko, ; Han et al., ; Katya, Yun, Yun, Lee & Bai, ; López, Flores‐Ibarra, Bañuelos‐Vargas, Galaviz & True, ; Sardar, Randhawa, Abid & Prabhakar, ). The TP level for fermented LM‐fed fish obtained in this study (43 g/L) was slightly higher than the reported TP concentration for barramundi when fed with narrowleaf lupin L .…”

Growth performance, fatty acid composition, and lipid metabolism are altered in groupers (Epinephelus coioides) by dietary fish oil replacement with palm oil

“…In contrast, feeding with the diets with 60% PO substitution (6.0% PO; Gao et al., 2012 ; Huang et al., 2016 ; Li et al., 2019 ) and/or 100% PO substitution (6.5% PO; Mu et al., 2020 ) led to reduced growth, feed utilization, HSI, and CF of large yellow croaker, Chu's croaker, and Japanese sea bass, compared with the control diet. Furthermore, the dietary PO inclusion level of more than 40% has been reported to significantly reduce the growth and feed utilization of Japanese flounder ( Han et al., 2015 ), as a result of lowered digestibilities of FA in PO vs. in FO ( Ng et al., 2003 ). It may be impractical to replace added FO completely when the diet contains a lower level (<40%) of fish meal, due to the low residual FO available in a low fish meal diet ( Deng et al., 2014 ).…”