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Maintenance requirement and utilisation efficiency of energy and protein for ongrowing pikeperch (Sander lucioperca (L.))

Zimmermann, J., Steinberg, K., Meyer, S., Schulz, C.
Aquaculture international 2019 v.27 no.4 pp. 1109-1123
Sander lucioperca, aquariums, body composition, body weight, crude protein, diet, digestible energy, digestible protein, energy, energy content, feed rations, feeding level, fish, light intensity, protein requirement, rearing, recirculating aquaculture systems, salinity, satiety, slaughter, tanks, temperature
Restricted ration levels of a commercial diet (Aller Metabolica) were fed to pikeperch (Sander lucioperca (L.)) (mean body weight 251.94 ± 1.12 g) to determine the energy and protein requirements for maintenance and the utilisation efficiency for growth. Fish were reared in a recirculating aquaculture system (RAS) with rectangular aquaria tanks for 57 feeding days at a temperature of 23 ± 0.5 °C, a salinity between 5 and 7 ppt and a light intensity of 35 ± 5 lx at water surface profile. A total of 17 fish per tank were fed in a triplicate approach at five increasing feeding levels starting from very low to nearly apparent satiation per hand twice a day. Comparative slaughter technique was used for the determination of body composition and energy contents. The body composition indicated an increase in energy content with increasing feed rations, whereas the filet composition was not affected. Maintenance requirement values for gross energy, digestible energy, crude protein and digestible crude protein were 14.44 kJ kg⁻⁰.⁸⁰ day⁻¹, 12.84 kJ kg⁻⁰.⁸⁰ day⁻¹, 0.58 g kg⁻⁰.⁷⁰ day⁻¹ and 0.53 g kg⁻⁰.⁷⁰ day⁻¹. The utilisation efficiency values were 0.44 for gross energy, 0.50 for digestible energy, 0.42 for crude protein and 0.45 for digestible crude protein. Relatively low maintenance requirement and high conversion efficiencies characterise pikeperch as a promising candidate for commercial aquaculture production.