(P < 0.05). Regression analyses using transformed numbers of salmon pan-parasites also show statistically significant positive relationships between C. truttae/D. sagittata, C. truttaelC. farionis and C. truttae/N. rutili. In addition C. farionis/C. metoecus are significantly positively associated (P = 0.008) whereas C. metoecus/C. truttae are significantly negatively associated (P < 0.024) (Table 34).

Regression analysis was also applied to analyse the nature of the associations between C. metoecus, C. farionis, C. truttae and N. rutili in the pyloric and post-pyloric regions of the trout intestines. The trout were segregated into 11 blocks on the basis of age and season (Thomas, 1964b). The results from %2 tests (Table 35) show the associations between C. metoecus/C. farionis, C. metoecus/N. rutili and C. metoecus/C. truttae in the pyloric caeca region were significantly negative except for one positive case involving N. rutili and C. metoecus. The only other significant positive relationship was that involving N. rutili/C. truttae in the pyloric region. In contrast, all the other statistically significant associations involving C. metoecus/N. rutili, C. farionis/N. rutili and C. farionis/C. truttae in the post-pyloric region were negative.

Table 33 The %2 results and P values of 2 x 2 contingency tests for the parasites of the salmon parr.
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