'8 



THE PEEIODIC GROWTH OF SCALES IN GADID.E 



POLLACK. 

 Summarised Table of Age, 



Note. — Summer is here taken as from April to October, 

 winter as from October to April. 



The next table is a summary of averages from the more detailed 

 tables to show, in a general way, the increase in the length and breadth 

 of scales, at various ages of the fish. From these tables it would be an 

 easy matter to calculate the approximate area of scales, as many of the 

 pollack's scales are nearly elliptical in shape. 



Summarised Table 

 Showing Average surface size of Scales in the Pollack at various ages. 



No. of 



fish. 



Bangs of 



length in 



cm. 



4-4-5-9 



6-1-7-0 



9-1.5-9-85 



10-0-10-80 



11-0-11-75 



28-5 

 35 -5-38 -6 

 44-40 

 60-0 



83-82 



Range of 



weight in 



grms. 



•64-1-45 

 1-67-2-35 

 6-60-9-25 

 6 -95-9 -45 

 9-35-12-20 



not taken 



530-535 



721-01 



1922-70 



4184-70 



Average lines of growth 

 in years. 



123456789 



3________ 



4 ________ 



16 ------_- 



17 ________ 



17 ________ 



28 20 ------- 



21 31 7 ----- - 



21 29 18 2 - - - - - 



24 25 18 22 3 - - - - 



26 25 12 12 11 9 11 10 3 



For purposes of comparison, I annex a short table of ages for 

 the pollack from Cunningham's paper on the " Eate of Growth of 

 some Sea Fishes " {Journal of Marine Biological Association, vol. ii., n.s., 

 1891-2). 



