The Effect of UV Irradiation on Rearing Water Quality, Growth, and Survival of European Lobster (Homarus gammarus, L.) Larvae

Figure 4

Principal component analysis (PCA) of water quality parameters of rearing tanks exposed (UV-treatment) or unexposed (CTRL-treatment) to UV disinfection. The mean values over the period 7–15 days poststocking recorded for the biochemical and microbial water parameters (Table 4) in each tank were used to form the principal components. PC1 separated the water quality horizontally and explained 41% of the variance. The PC2 separated the variables vertically and explained 32.8% of the variance. The contribution of the variables (biochemical and microbial parameters) is represented by the arrows and the stronger the correlation with PC1 or PC2, the longer the arrow is.