SEA-FISHERIES LABORATORY. 



187 



showing the region into which the marked plaice have spread, 

 from the region occupied during the previous two months. 

 We see, then, that there are three directions of migration : 

 (1) The retrograde one back to the " area of liberation " and the 



FlG. 14. General synoptic chart showing the migrations of marked plaice 

 during the months August-December. 



similar regions to North and South of the latter- this is very 

 evident in the mouths November and December, and it still 

 continues during the mouths January and February. The 

 plaice are seeking the shallow-water regions just oil' the 



