The catch of yellcwfln tuna, both adults and young, on these grounds is 

 a great deal smaller than that of black tuna, and the season is limited to 

 the Buir."<er. Excluding the young yellow mejl. the iieight distribution was 

 sou^t for yellowfin weighing over 10 kg. The graph of this distribution is 

 shown in Fig. 5 where it can be seen that the maximum values for the number of 

 fish of each size in the catch are rather widely separated. If we take these 

 as the average weights for /ellowfln of each age in the summer season and plot 

 a growth curve, we get the result shown in Fig. 6, In the case of yellowfin 

 over 50 kg In wei^t the maxijnum values for the number of fish in the catch 

 are not clear, the number of fish is aoalla and accordingly their growth rate 

 is unknown. 



(at the Flsherias Experiment Station) 



Fig.l Location of the Shig«d«r« 

 fishing grounds 



12 



