The course of growth, feed Intake and feed efficiency of different Turbot (Scophthalmus maximus) strains in recirculating aquaculture systems.

Lugert, Vincent, Hopkins, Kevin, Schulz, Carsten, Schlicht, Kristina and Krieter, Joachim (2018) The course of growth, feed Intake and feed efficiency of different Turbot (Scophthalmus maximus) strains in recirculating aquaculture systems. Open Access Turkish Journal of Fisheries and Aquatic Sciences, 19 (4). DOI 10.4194/1303-2712-v19_4_05.

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Supplementary data:

Abstract

We fitted the flexible nonlinear model to longterm data of daily gain (DG), feed intake (FI) and feed efficiency (FE) of different strains of communally-reared turbot from a recirculating aquaculture system (RAS). We modelled each trait (y = DG, FI, FE) as a function of actual body size (x). We used the coefficient of determination (R²) to display the suitability of the model. The curves of each trait were analyzed via shape, location of the point of inflection (POI), minimum (Min.) and maximum (Max.). The relationships between FI and FE to actual size were the same for both strains although the magnitude of the curves diverged. Diversion of the growth curves, related to sexual dimorphism, occurred similar in both strains at 460-500 g body weight. We observed a major change in turbot growth characteristics with a POI between 60-110 g weight, 15.7-18.6 cm length respectively. Our results verify several distinct life-stages, which cause changes in trait characteristics, as well as strong sexual dimorphism. Accordingly, findings from experiments with juvenile fish cannot be extrapolated to mature fish. We could prove that the biological processes related to growth are still the same in different breeding strains.

Document Type: Article
Keywords: Turbot, Breeding strains, Nutrition modelling, Biological traits, Recirculating aquaculture systems
Research affiliation: Kiel University > Kiel Marine Science
OceanRep > The Future Ocean - Cluster of Excellence
Kiel University
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.4194/1303-2712-v19_4_05
ISSN: 1303-2712
Projects: Future Ocean
Date Deposited: 30 Jan 2019 12:04
Last Modified: 02 Apr 2019 09:37
URI: http://oceanrep.geomar.de/id/eprint/45586

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