Quantitative Data

There are strong, statistically significant tendencies for the mean abundance of parasites to increase with the length and weight of the brown trout (Table 15). The F values indicate that these relationships are particularly strong in the case of the nematodes. In contrast to the trout the relationships between the size of the salmon parr and the mean abundance of parasites were less clear (Table 16). Thus, there were statistically significant tendencies for the mean abundance of D. sagittata, C. metoecus and C. farionis to increase with the length of the salmon parr (P < 0.05, < 0.05 and < 0.002, respectively). However, there were no statistically significant relationships between the mean abundance of

Table 15 The regression equations showing the relationships between the transformed number of parasites {log|0 (1 +x)} and loge (In) of the length (cm) and loge (In) weight of the trout (g)

Regression equations

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