258 



TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



cause is probably the decrease in the intensity of the 

 plaice-fishery during the months of September-December. 

 Marked plaice are usually recaught by sailing trawlers, 

 and the unfavourable weather usually experienced during 

 October to December is prejudicial to the fishery. It will 

 be seen from the statistics of plaice landed in the 

 Lancashire and Western Fisheries District that there is 

 an undoubted falling off in the intensity of the plaice 

 fishery during those months. Consequently, fewer marked 

 fishes are recaught. 



The following table is compiled from the results of 

 the experiments of 1905 and 1906 : — 



Hate of Growth of Marked Fishes from Month 

 to Month. 



Month. 



No. of Fishes 

 Recaught. 



Average Increase in 

 Length. 





45 



22 

 15 

 21 

 27 

 18 

 24 

 16 

 13 

 3 

 7 



0-04 inches (0*1 cm.) 

 0-04 ., (0-1 cm. 

 0-17 „ (0-4 cm.) 

 0-22 „ (0-5 cm.) 

 0-53 ,. (1-34 cm.) 

 0-92 „ (2-35 cm.) 

 1-7 „ (4-33 cm.) 

 1-7 „ (4-33 cm.) 

 2-44 „ (6-12 cm.) 



February 



March 



April 



May 



July 



August 



September 



October 



November 



2-4 „ (6-12 cm.) 

 2-37 „ (6-1 cm). 









The results are represented graphically in Fig. 8. 



It will be seen from the table and chart that the 

 growth during January, February and March is 

 practically nil. Indeed, the months October, November 

 and December are also to be included, since a large 

 number of the fishes included in the table for January 

 were liberated in the preceding October and November of 

 both years, and some were recaught during those months. 



