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Abstract:

The use of fishmeal and fish oil for aquaculture purposes is often questioned as it is considered to be non-sustainable. The cultivation of carnivorous species in particular requires an input of fishmeal and fish oil - often ex-pressed as FIFO: Fish In / Fish Out ratio - which, in theory, can be greater than 1. Although enormous progress has been made in this area in recent decades by reducing the fishmeal content (and replacing it by e.g. vegetable pro-tein sources) in feeds on the one hand and improved feed conversion (FCR) on the other, the search for high-performance, alternative protein sources remains very relevant. In this regard, insect meal can be an interesting option, as well as so-called single cell proteins (SCP) that are a by-product of various fermentation processes - whether or not modified. The main objective of this research was to investigate the potential of a composite core based on SCP as a fishmeal replacer for rainbow trout (Oncorhynchus mykiss) - a carnivorous species. Large volumes are grown in Europe and there is an increasing demand for more sustainable feeds. In this respect, the replacement of fishmeal by SCP could offer an answer.