SEA-FISHERIES LABORATORY. 



213 



Table XVIII. Lengths of Plaice of Age-group III, 

 Liverpool Bay, 1908-1915. 



S : 



Mean 













1 



Length. 



VI 



VII 



VIII 



IX 



X 



XI 



16-5 















17-5 



3 













18-5 



4 



4 



"i 









195 



7 



6 











20-5 



16 



2 



i 





i 



i 



21-5 



16 



5 



10 





i 





22-5 



10 



11 



7 









235 



18 



10 



7 



11 





i 



245 



7 



9 



7 



8 







25-5 



7 



9 



8 



6 



i 





26-5 



5 



7 



9 



10 





4 



27-5 



4 



6 



6 



4 



3 





28-5 



2 



4 



4 



5 



2 



1 



295 



2 



1 



6 



3 



2 



3 



30-5 



1 





3 



2 





3 



315 



1 





4 



4 





1 



32-5 







1 



1 





2 



335 









... 





1 



345 



i 









"i 





355 









1 





i 



365 









1 





i 



Totals 



104 



74 



77 



67 



n 



19 



Means 



23-0 



239 



25-4 



25-9 



I 



27-3 



29-5 



Relative abundance of Groups II and III — Liverpool Bay. 





II 



III 



Ratio of II to III 



1908-16 



3,638 



442 



100 : 12 



1914-16 



630 



73 



100 : 12 



1920 



928 



802 



100 : 86 



Next, we take the year 1920, for which we have better 

 data. Table 19 gives the results of measurements of plaice 

 caught in Liverpool Bay during the months June to December, 

 distinguishing the sexes and stating the measurements for each 

 month separately. Also Age-groups II (over two and under 

 three years old) and III (over three and under four) are distin- 

 guished. Now it is obvious that the data for the months 

 June to August in the case of Age-group II are incomplete, 



