Commercial microdiets with different particle sizes,
Gemma Micro 150 and 300 (120–200 and 200–450 μm,
respectively), along with Gemma 0.3 (300–600 μm)
(Skretting) and Proton 1, 2/3, 2/4 (100–200, 200–400
and 300–500 μm, respectively) (INVE) were used in the
experiment (Fig. 1).