<abstract xmlns="http://www.w3.org/1999/xhtml"><p>Feasibility of total replacement of fish oil (FO) with vegetable oils (palm oil (PO) and soybean oil (SO)) in practical diet for <italic>Heterobranchus longifilis</italic> fingerlings was evaluated. Six iso-nitrogenous and iso-caloric diets were prepared. Control diet (A) used FO as the lipid source, diets B–F contained various blends of palm and soybean oils. Fish were fed to apparent satiation twice daily for twelve weeks. No significant (<italic>P</italic> > 0.05) differences were observed for feed intake, weight gain, feed conversion ratio or specific growth rates among dietary treatments. Activities of glucose-6-phospate dehydrogenase (G6PDH) and malic enzyme (ME) were significantly (<italic>P</italic> &lt; 0.05) higher in fish fed diet C (1.5 % PO). Generally, hepatic G6PDH activity was about 3-4 times higher than ME activity in fish fed the experimental diets. The tissue fatty acid (FA) profiles in fillet and liver reflected the dietary FA compositions. However, the concentrations of eicosapentaenoic acid and docosahexaenoic acid were higher in fish tissue (fillet and liver) than in the diets. Results from the present study indicate that replacement of fish oil with vegetable oil resulted in satisfactory growth and body composition characteristics in <italic>Heterobranchus longifilis</italic>. Compared with soybean oil, palm oil is relatively cheap and readily available; therefore, diet F (6 % PO) is recommended for use in <italic>H. longifilis</italic> diet.</p></abstract>

Feasibility of total replacement of fish oil (FO) with vegetable oils (palm oil (PO) and soybean oil (SO)) in practical diet for Heterobranchus longifilis fingerlings was evaluated. Six iso-nitrogenous and iso-caloric diets were prepared. Control diet (A) used FO as the lipid source, diets B–F contained various blends of palm and soybean oils. Fish were fed to apparent satiation twice daily for twelve weeks. No significant (P > 0.05) differences were observed for feed intake, weight gain, feed conversion ratio or specific growth rates among dietary treatments. Activities of glucose-6-phospate dehydrogenase (G6PDH) and malic enzyme (ME) were significantly (P < 0.05) higher in fish fed diet C (1.5 % PO). Generally, hepatic G6PDH activity was about 3-4 times higher than ME activity in fish fed the experimental diets. The tissue fatty acid (FA) profiles in fillet and liver reflected the dietary FA compositions. However, the concentrations of eicosapentaenoic acid and docosahexaenoic acid were higher in fish tissue (fillet and liver) than in the diets. Results from the present study indicate that replacement of fish oil with vegetable oil resulted in satisfactory growth and body composition characteristics in Heterobranchus longifilis. Compared with soybean oil, palm oil is relatively cheap and readily available; therefore, diet F (6 % PO) is recommended for use in H. longifilis diet.

Effects of dietary vegetable oils on growth, lipogenic enzyme activities and tissue fatty acid composition of <italic>Heterobranchus longifilis</italic>

Agricultura Tropica et Subtropica

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Effects of dietary vegetable oils on growth, lipogenic enzyme activities and tissue fatty acid composition of 

Feasibility of total replacement of fish oil (FO) with vegetable oils (palm oil (PO) and soybean oil (SO)) in practical diet for Heterobranchus longifilis...

Effects of dietary vegetable oils on growth, lipogenic enzyme activities and tissue fatty acid composition of Heterobranchus longifilis

Published Online: Mar 20, 2020

Page range: 97 - 104

Received: Mar 13, 2019

Accepted: Dec 23, 2019

DOI: https://doi.org/10.2478/ats-2019-0011

Keywords
fatty acid composition, fish oil, growth performance, lipogenic enzyme activities, vegetable oil

© 2019 Theophilus Olayiwola Babalola et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Effects of dietary vegetable oils on growth, lipogenic enzyme activities and tissue fatty acid composition of Heterobranchus longifilis

Published Online: Mar 20, 2020

Page range: 97 - 104

Received: Mar 13, 2019

Accepted: Dec 23, 2019

DOI: https://doi.org/10.2478/ats-2019-0011

Keywordsfatty acid composition, fish oil, growth performance, lipogenic enzyme activities, vegetable oil

© 2019 Theophilus Olayiwola Babalola et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Keywords
fatty acid composition, fish oil, growth performance, lipogenic enzyme activities, vegetable oil