Sammendrag
Single-cell ingredients (SCI) are considered promising nutrient sources which are
produced using environmentally friendly biotechnological processes. The aim of
the current study was to evaluate the replacement of fishmeal, plant protein
sources, and fish oil with SCI in organic feeds for European sea bass (Dicentrarchus
labrax). Bacterial protein, yeast protein, and microalgae were used to replace
fishmeal trimmings, soya bean meal, and fish oil from trimmings. Triplicate groups
(30 fish per replicate) of European sea bass (14.4 ± 2.4 g) were fed the
experimental diets for 71 days. The results showed that the incorporation of
SCI at all levels of inclusion significantly enhanced nutrient digestibility.
Additionally, growth performance parameters were not affected by SCI
inclusion, exhibiting similar or improved values. Moreover, a tendency for
improved anterior and posterior gut structure was observed and a significant
increase of lysozyme activity at the two highest inclusion levels of SCI was
determined. Overall, the results showed that the inclusion of SCI at 15%
(bacterial: yeast: algae—9.4: 4.7: 1) is possible without compromising any of
the parameters evaluated. According to these findings, a higher substitution of
fishmeal trimmings, plant protein sources, and fish oil from trimmings with SCI in
organic diets for European sea bass (D. labrax) can be further evaluated in future
studies.
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