Measuring individual feed efficiency and its correlations with performance traits in Nile tilapia, Oreochromis niloticus

De Verdal Hugues, Mekkawy Wagdy, Lind Curtis E., Vandeputte Marc, Chatain Béatrice, Benzie John A.H.. 2017. Measuring individual feed efficiency and its correlations with performance traits in Nile tilapia, Oreochromis niloticus. Aquaculture, 468 (1) : 489-495.

Quartile : Q1, Sujet : MARINE & FRESHWATER BIOLOGY / Quartile : Q1, Sujet : FISHERIES

Résumé : Estimating individual feed intake of fish held in groups has long been a challenge precluding precise knowledge of the individual variation of feed efficiency (FE) in fish. In this study, counts of the number of feed pellets (1.63 mg on average) eaten by individual tilapia (Oreochromis niloticus) held in 8 mixed sex groups of 15 fish were measured from video recordings made over a period of 10 days where fish were fed twice daily to achieve compensatory growth after 10 days of fasting. The initial body weight of the fish was 9.77 ± 2.03 g. Accumulated measures of feed intake (FI) over 11 meals were found to achieve 95% repeatability and a high accuracy of estimation of FI. During the FI measurement period, the average fish growth was 12.0 ± 3.6 g, feed intake was 0.99 g day− 1, and feed conversion ratio (FCR) was 0.86 ± 0.20. FI differences accounted for 56% of the observed individual growth variations, and 44% was related to individual variations of FE. On average males grew 24.2% faster than females but consumed 12.1% more feed. Males showed an 11.7% better FCR than females, whereas residual feed intake (RFI) differences were not significant between sexes. FCR and RFI were moderately and significantly correlated (0.58 ± 0.06) but FCR and FI, and body weight gain (BWG) and RFI, were not, highlighting the complex relationships between feed efficiency traits. The approach described here demonstrates a means to accurately investigate FE traits in fish and to assess the potential for their genetic improvement.

Mots-clés Agrovoc : Oreochromis niloticus, efficacité conversion alimentaire, alimentation des poissons, prise alimentaire (animaux), aquaculture, Tilapia

Mots-clés géographiques Agrovoc : Malaisie

Classification Agris : M12 - Production de l'aquaculture
L02 - Alimentation animale
L51 - Physiologie animale - Nutrition

Champ stratégique Cirad : Axe 1 (2014-2018) - Agriculture écologiquement intensive

Auteurs et affiliations

• De Verdal Hugues, CIRAD-PERSYST-UMR ISEM (MYS) ORCID: 0000-0002-1923-8575 - auteur correspondant
• Mekkawy Wagdy, Ain Shams University (EGY)
• Lind Curtis E., Centre mondial sur le poisson (MYS)
• Vandeputte Marc, INRA (FRA)
• Chatain Béatrice, IFREMER (FRA)
• Benzie John A.H., Centre mondial sur le poisson (MYS)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/583656/)

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