Manchester Meuioiis, Vol. Irii. (jpiS), No. 3. 3 



recoi'd differences in the results of the two years, the full 

 meaning of which cannot at present be understood. 



The results obtained in 191 1 are ver}^ similar to those 

 of iQioin one respect (see Tables 2 and 3). The majority of 

 the fish, 94'69% (see Table 3) spent only 2 or a little more 

 than 2 years (= 2 +) in the river before going down to 

 the sea. In 19 10 the percentage was slightly lower, 917% 

 (see Table 2), but this small difference is of little import- 

 ance. Of the remaining 5'3i% (in 1911) it is interesting to 

 notice that slightly more than half (2"84%) lived in the 

 river for three years, while the rest spent less than 2 

 years in the river. These i)ro[)ortions roughly correspond 

 with those obtained for the 1910 fish. Among the fish 

 which spent less than 2 years in the river (see Table 5), 

 by far the greater p. umber remained in the sea for 3 

 or more \-ears,and on!)- 22-5% returned to the river after 

 remaining in the sea for less than 3 years. When we 

 come to consider the fish which s[)ent 3 or 3 -f years 

 in the river the percentages are reversed, i.e., the majority 

 remained less than 3 years in the sea. The greater 

 number of those fish which were 2 or 2 + years old at 

 the time of migration returned to the river after an absence 

 of less than 3 years. 



The important point to be noticed in these figures is 

 that as a rule the fish which lingers in the river for a con- 

 siderable time spends a briefer period in the sea before 

 returning to spawn than a fish which had a short life in 

 the river as a parr. It is true that up to December, 191 r, 

 no more than 100 fish were examined from the Wye 

 which had spent either r and i -f or 3 and 3+ years in 

 the river ; that is to sa\', decidedly more or less than the 

 average. This means that only 5'5% were exceptions to 

 what appears to be the normal type characteristic of the 

 Wye. In other words, the characteristic type of fisb that 

 occurs in the Wye is one which spends two years in the 



