14 
1 in the second six months, and 1 in the third six months. 
The mean size of those mig-rating’ over 10 miles is 
22’3, the smallest being* IT'8, and the mean size of those 
showing* little or no niig*ration is 21*9, the largest being 26*7 
cm. There is therefore no connexion which can he pointed 
out as to the relation of size and maturity to migration. It 
has already been apparent from the trawling records that an 
important annual migration of dabs takes place from the 
shore into deeper water. Some of these at all events return 
to the inshore regions again. In two cases of which we have 
record the return was to a bay to the south of the place of 
liberation, viz., from Skate Eoads to Druridge Bay, and from 
Alnmouth Bay to Cambois Bay. It is interesting in this 
connexion to point out that in the case of those which were 
recaptured beyond the district the recaptures were made, 
three of them in October, and the remaining two in January 
and February, that is to say, during the period of the annual 
winter migration. 
The general direction of migration therefore appears to be 
southerly. The furthest distance south reached by one of 
tlie dabs is Scarborough South Bay, a distance of 60 miles in 
166 days. 
V Reports, 1904, p. 74 ; 1905, p. 56 ; 1906, p. 25 ; 1907, p. 21. 
Flounder . — Table 3, Chart 3. — The total number 
liberated was 382, viz., 25 in 1904, 42 in 1905, 154 in 1906, 
and 161 in 1907. The recaptures number 77 or 20*2 per cent. 
Nineteen show migration of over 10 miles, and of these 17 
were cauglit in the first year. The mean size of the recap- 
tured flounders which migrated more than 10 miles is 30*7 
cm., the smallest being a male of 18*5 cm. The mean size of 
those which migrated less than 5 miles is 26*2 cm., the 
largest being 35'8, sex unknown. 
As in the plaice so in the flounder approaching maturity 
appears to be the prime factor in migration. In all cases 
where examination was made of the flounders migrating more 
than 10 miles, thev were found to be mature or spent. 
The general direction of migration is northerly, several 
being recaptured in the Firth of Forth and St. Andrew’s Bay, 
one going so far as Aberdeen. Two, however, show migra- 
tion to the soutli, one to Filey and the other to the east of 
