Effects of 12 factors on burbot Lota lota (L., 1758) weaning performances using fractional factorial design experiment

International audience Sixteen weaning protocols for burbot were tested by using a fractional factorial design experiment taking into account 12 factors (feeding, environmental and stocking density factors) with two modalities. A high survival rate (76%), associated with the lowest cannibalism rate...

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Bibliographic Details
Published in:Aquaculture
Main Authors: Trabelsi, Awatef, Gardeur, Jean-Noel, Teletchea, Fabrice, Fontaine, Pascal
Other Authors: Unité de Recherches Animal et Fonctionnalités des Produits Animaux (URAFPA), Institut National de la Recherche Agronomique (INRA)-Université de Lorraine (UL), Université de Sfax
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2011
Subjects:
Fractional factorial design
Weaning protocol
COD GADUS-MORHUA
FRESH-WATER FISH
ATLANTIC SALMON
LARVAE
GROWTH
FOOD
DIETS
LAKE
SOLE
Lota lota
Gadiformes
SALMON SALMO-SALAR
[SDV]Life Sciences [q-bio]
[INFO]Computer Science [cs]
Atlantic salmon
Burbot
Gadus morhua
Salmo salar
lota
Online Access:https://hal.inrae.fr/hal-02645856
https://doi.org/10.1016/j.aquaculture.2011.03.027
Description
Summary:International audience Sixteen weaning protocols for burbot were tested by using a fractional factorial design experiment taking into account 12 factors (feeding, environmental and stocking density factors) with two modalities. A high survival rate (76%), associated with the lowest cannibalism rate (7%) was recorded for a combination that groups: a long photophase (18 h), low light intensity (70 lx), white tank colour, slightly salty water (5 ppm), high larval density (150 individuals/L), a dry commercial food (AgloNorse) distributed every hour without a co-feeding period, a long weaning duration (10 days) and feeding rate decrease (30% daily). In this combination, however, specific growth rate was weak (13%.d(-1)) compared to other combinations where growth rate was high but associated with both high cannibalism and final weight heterogeneity. Statistical analyses of factor effects showed that low salinity associated with dry food distribution as well as a long weaning period (10 days) increased significantly the survival rate (p<0.05). Total mortality was associated with no salinity, a short weaning duration and feeding at daylight with INVE food (Lansy). Different combinations of treatment modalities can lead to similar performances implying that significant effects were modified by others within the rearing system and that all interactions had not been highlighted. (C) 2011 Elsevier B.V. All rights reserved.

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