the growth is very rapid, the death rate is so high that few fish reach 
the marketable size and in the Bay of Islands the growth is so 
stunted that it may be doubted whether any individuals reach any 
considerable size. Apparently the fish that live longest and become 
50 
yto 
2 + 
ae . 
z ¢ 
4 4 
es 
S = 
® pa 
1S) 
230 F 
oma 2 
7 » 
‘ON i=) 
ex] o 
S rd 
20 
5 
is 
s 10 
Age in Years. 
Fic. 12.—Curves illustrating the rate of growth cf the plaice in different regions. 
the largest are those in waters of middle warmth. We have shown 
this condition in the figure by the fine line which gives a growth to 
a length of two feet in twenty-two years. This is the ‘optimum’ or 
best growth of the plaice. 
24 
