SEA- FISHERIES LABORATORY. 251 



that is, only those that had lived in the Piel tanks for 

 some weeks after capture were marked, and when liberated 

 they were in very good condition. Altogether it would 

 seem as if the results of this experiment do roughly give 

 us an idea as to the extent to which the operations of about 

 a dozen fishermen using stake-nets and second-class 

 trawling vessels sampled a stationary population; that is, 

 a plaice population which entered Barrow Channel at the 

 beginning of 1913, which did not leave it during the 

 greater part of the year, and which was not recruited from 

 external regions throughout the same period. 



Experiments III and IY. (Chart III.) 



These may be taken together. The former was made 

 in June, and the latter in July, and IT fishes from the first 

 experiment were recovered, while only three from the 

 latter came back to us. There are three groups of 

 recoveries, (1) fish which have moved further offshore 

 from the place of liberation during the months July to 

 October; (2) fishes which have migrated further inshore 

 during November; and (3) fish which have moved to the 

 westward, toward the winter grounds off the coasts of 

 Anglesey and Carnarvon during December. This latter 

 group is represented by only two recaptures, and the second 

 group by only five recaptures, but the facts are significant 

 since they are similar to those of other corresponding 

 experiments. 



Experiment Y. (Chart IV.) 



Quite good results were obtained from this experi- 

 ment. The fishes marked and liberated were 283 plaice 

 and 14 soles. Fifty-five of the former and one sole were 

 returned. The sole was caught only a few days after the 

 date of liberation, so that this single result does not give 

 much information as to the value of the method of 

 marking. 



R 



