The inclusion of the IS in the diet significantly affected final fish size distribution in BW
f
and SL
of rainbow trout fingerlings (Fig. 1a, b). Although fish fed all tested diets showed a unimodal and symmetric distribution of BW
f
and SL
f
f
, animals fed both IS diets showed a left-skewed distribution of values in comparison to fish fed the C diet. The proportion of larger animals in terms of BW
(51–70 g) was observed among fish fed the 10 and 20 IS diets (43.0 ± 2.1% and 38.4 ± 5.5%, respectively), whereas it was only 13.0 ± 5.1% in fish fed the C diet (P b 0.001). In addition, the proportion of larger animals (15–17 cm in SL
f
) was ca. 2.8–2.4 times higher in fish fed 10 and 20 IS diets (47.1 ± 5.3% and 40.4 ± 2.1%, respectively) in comparison to the control group (16.9 ± 6.1%) (P b 0.001). Regarding the Fulton's condition factor, statistically significant differences were detected among trout fed C and both IS diets (Table 2). In this sense, rainbow trout fingerlings fed 10 and 20 IS diets showed a higher proportion of specimens with K values comprised between 1.5 and 1.7 (80.3 ± 2.1% and 74.8 ± 5.2%, respectively) than fishfedtheCdiet(56.3±5.3%)(P b 0.001). Inversely, fish fed the control diet resulted in a higher proportion of fish of lower Kvalues(1.2−1.4) (31.9 ± 4.3%) in comparison to those fed 10 and 20 IS diets (16.9 ± 3.1% and 18.5 ± 1.2%, respectively) (P b 0.001) (Fig. 2).
f