Fig. 1: Biometric parameters.

Split violin boxplots of total body wet weight (TBWW) (g) (A), gonad wet weight (GWW) (g) (B), gonad index (GI) (%) (C), pyramid plot of gonad wet weight change (GWWC) (%) compared to week 0 (D) and correlation heatmap between biometrical parameters (E) of Echinus esculentus (EC) and Strongylocentrotus droebachiensis (ST) gonads. In the split violin boxplots, the narrow dashed lines visualize 25–75% of specimens values, wide dash lines (median), and solid lines (mean). In the pyramid plot, the error bars represent one standard deviation. In the correlation heatmap, the HD Height diameter, WD Width diameter; ***P < 0.001. PFT and PSP are the significant levels (GLM) for the effects of feeding time and species, respectively. a–cDifferent lowercase letters within each species indicate significant differences (P < 0.05) in biometric parameters throughout feeding time. A-BDifferent uppercase letters within each feeding time indicate significant differences (P < 0.05) in biometric parameters between the species at the same feeding time. This graph was created with OriginPro 2022 (OriginLab Corp.).