SEA-FISHERIES LABORATORY. 269 



Explanation of the Charts. 



The charts are to be regarded as exhibiting objective 

 representations of the migrations of the fishes. Except in 

 Chart I it has not been attempted to express synoptically 

 these migrations. Probably the accumulation of several 

 years' results will enable this to be done. In the meantime 

 it is best to indicate the facts only. 



The lines connecting the stations of liberation with the 

 places of recovery do not, of course, necessarily indicate the 

 migration paths. 



It was often difficult to be sure of the exact position of 

 recapture. Depth of water, for instance, as given on an 

 Admiralty chart, often does not agree with the recorded 

 position of recapture. It is perhaps nearly always the case 

 that there may be an error of from one to several miles in 

 the recorded place of recapture, since a fish may be caught 

 at any point of a haul (which may be from 2 to 24 miles in 

 length). 



