Effects of varying dietary protein to lipid ratios on growth performance and body composition of juvenile pike perch (Sander lucioperca) |
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| Authors: | C SCHULZ M HUBER J OGUNJI & B RENNERT |
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| Institution: | Institute of Animal Breeding and Husbandry, Marine Aquaculture, Christian-Albrechts-Universität zu Kiel, Olshausenstraβe 40, D-24098 Kiel, Germany;; Institute of Animal Science, Faculty of Agriculture and Horticulture, Humboldt-Universität zu Berlin, Philippstr. 13, Berlin, Germany;; Leibniz-Institute for Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, Berlin, Germany |
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| Abstract: | The present study investigated the effect of varying dietary protein‐to‐lipid ratios (P/L) on growth performance and body composition of pike perch (Sander lucioperca) fingerlings with an initial body weight of 1.35–1.40 g. Triplicate groups were reared during 56 days in recirculation systems and fed six experimental diets containing three dietary levels of lipid (90, 130, 170 g kg?1 of dry matter, d.m.) combined with two levels of dietary protein (470, 540 g kg?1 d.m.). During the experimental period the fixed feeding rates decreased from 10% to 5% of the total fish biomass per day. In contrast to previous results obtained with this species, the present study clearly demonstrated the occurrence of protein sparing effect. The best results for feed conversation ratio and specific growth rates were obtained in the treatments containing highest lipid level: diet 3 (P/L 47/17) and diet 6 (P/L 53/17). The d.m. and crude lipid contents of pike perch whole body increased in direct proportion of the dietary lipid levels. No difference was observed on crude protein and ash content among the treatments. Increasing hepatosomatic index at highest dietary lipid level suggested a limited lipid utilization of percids. |
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| Keywords: | body composition growth performance pike perch protein-to-lipid ratio protein utilization |
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