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Fishes 2017, 2(1), 1; doi:10.3390/fishes2010001

Effect of Feed Protein:Lipid Ratio on Growth Parameters of African Catfish Clarias gariepinus after Fish Meal Substitution in the Diet with Bambaranut (Voandzeia subterranea) Meal and Soybean (Glycine max) Meal

1
Department of Biological and Environmental Science, University of Jyväskylä, Jyväskylä 40014, Finland
2
Finnish Environment Institute, Helsinki 00251, Finland
3
Natural Resources Institute Finland, Jyväskylä 40500, Finland
4
Presently: Department of Fisheries and Aquatic Resources Management, Michael Okpara University of Agriculture, Umudike, Umuahia Abia State, Nigeria
*
Author to whom correspondence should be addressed.
Academic Editor: Francisco J. Moyano
Received: 13 November 2016 / Revised: 22 January 2017 / Accepted: 23 January 2017 / Published: 30 January 2017
(This article belongs to the Special Issue Nutritional Requirements in New Fish Species Under Culture)
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Abstract

Fishmeal (FM) was substituted with soybean meal (Glycine max) (SBM) and bambaranut meal (Voandzeia subterranea) (BNM) in 10 experimental African catfish, Clarias gariepinus, diets. Feed formulation was designed using mixture model. The inclusion level of the three protein ingredients varied between 0% and 60%. Remaining 40% comprised of basal ingredients kept constant for all 10 feeds. African catfish of average initial weight 35.2 ± 0.9 g were fed with one of the treatment diets for 28 days. The protein:lipid ratios of the diets (range 1.5–3.4:1) were used in evaluating the feed utilization and growth of the fish. We found that catfish performances were mainly depending on ingredients and not the ratio itself. The protein:lipid ratios in the diets made of plant ingredients were high but SGR was low. Specific growth rate (SGR) increased with the increase of feed FM content, being ca. 5% day−1 with 60% FM diet but ca. 2% day−1 at both 60% BNM and 60% SBM diets. SGR was similar (3.5% day−1) with diets of 30% BNM or SBM inclusion with 30% FM. Feed conversion ratio increased from below 0.6 of the 60% FM diet up to 1.5 (60% SBM) and 1.7 (60% BNM). Protein efficiency ratio decreased linearly with increasing FM substitution, but protein productive value (PPV) was similar for catfish fed 60% FM diet and its 50% substitution with BNM or SBM. These results suggest that protein:lipid ratio cannot be used in assessing nutritional performance if the source of feed ingredient vary widely. However, these results suggest that BNM can partly substitute FM and completely replace SBM in the diets of African catfish. View Full-Text
Keywords: fishmeal substitution; plant proteins; bambaranut; soybeans; mixture designs fishmeal substitution; plant proteins; bambaranut; soybeans; mixture designs
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MDPI and ACS Style

Enyidi, U.D.; Pirhonen, J.; Kettunen, J.; Vielma, J. Effect of Feed Protein:Lipid Ratio on Growth Parameters of African Catfish Clarias gariepinus after Fish Meal Substitution in the Diet with Bambaranut (Voandzeia subterranea) Meal and Soybean (Glycine max) Meal. Fishes 2017, 2, 1.

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