

13 



found farther north than the latitude of the station (56° 55' N.) and farther south. 

 Of a total of 720 recaptured, 380, or 52'8 per cent., were found to the north, and 

 319, or 44'3 per cent., to the south ; 21 were recaptured in the same latitude. It 

 will be observed that the proportion which went north was, as a rule, least in the 

 experiments made in summer, and largest in those made in autunm. 



As is shown in the section dealing with the migration of spawning fish, this 

 seems to be due to the more marked northerly migration of the fish with ripening 

 reproductive organs in autumn. 



All the recaptured plaice from this station have been dealt with according to 

 the first method referred to above for the experiments at 20 miles east of May. 

 It will be seen from the follo\^nng table that 84 fish were recaptured in the " north- 

 and-east " quadrant, the mean direction being N. 33° E., the aggregate mileage 

 3661, and the average distance travelled 43-6 miles ; when this line is placed on 

 the chart, it passes north-east, parallel to the coast, to the latitude of Rattray 

 Point. No less than 366 went to the " north -and- west," the mean direction in 

 this case being N. 45° W., the aggregate mileage 15,143, and the average distance 

 migrated 41*4 miles ; this line, when placed on a chart, passes into Aberdeen Bay. 

 To the " south -an d-east " 36 fish were recaptured, the mean direction being S. 

 24° E., the aggregate mileage 1049, and the average distance migrated 29 miles ; 

 this line passes offshore to the south-east. To the " south -and- west " 229 fishes 

 were recaptured, the mean direction of migration being S 52° W., the aggregate 

 mileage 7319, and the average distance migrated 32 miles ; this line runs almost 

 parallel to the coast, but a little more to the west, to nearly opposite the mouth of 

 the Tay. It will be seen that the general westerly movement of the migrations 

 above referred to is conspicuous, 595 of the fish being taken to the westward ol 

 the station, and 120 to the eastward. 



It 



[Table. 



