1897 - 98 .] Migratory Movements of Salmonidce. 55 
redd was on 26th Nov. far up Talla, the last on 13th Dec., 
i.e., two months earlier than the last salmon redd. We have 
already noticed, however, that after this date very few sea trout 
were present in the river. With the exception of the first date 
mentioned for sea trout, the other redds made by this species 
were noticed on 12th and 13th Dec. This indeed marks the 
height of the sea trout period in Tweedsmuir for 1896, the salmon 
being recorded as spawning during a much more extended period. 
The total number of fish counted in the area under consideration 
was 1004, or 502 pairs. It may be matter of remark that, with so 
many fish in the water, there should have been only 71 redds. 
It should be recollected first, however, that amongst the thousand 
and four fish are very many enumerated more than once, whereas 
the 71 is the actual number of redds present in the river so far as 
the watchers could ascertain. To determine the difference in size 
between a salmon and a sea trout redd, 20 redds of the former and 
10 of the latter were measured. The average length of the salmon 
redd, measuring from the upper end of the trough to the centre of 
the tail gravel thrown up below, was found to be 4 feet 6 in., and 
the breadth about 3 feet. The sea trout redd averaged 30 inches 
long by about 20 inches broad. 
I believe I am correct in saying that every adult fish seen in the 
district was a fish in spawning condition, that no unripe fish is 
ever found so high up the river, and I believe that the difference 
between the 71 redds and the 502 pairs of fish is almost entirely 
accounted for by the diligent practice of local and other poachers. 
