286 BULLETIN OF THE BUREAU OF FISHERIES 
For those years which the data cover, the fact that many of the same com- 
panies and boats which operated in Prince William Sound also operated in the Kodiak- 
Afognak district, in Cook Inlet, and (in 1928) at Unalaska influences the proportions 
of fish taken from this area before, compared with that taken after, the date upon 
which fishing is permitted in these other localities. The season has usually opened 
about three weeks earlier in Prince William Sound than in the aforementioned 
districts. These other areas usually have produced larger fish than has Prince William 
Sound, so that while good runs of herring occur there, the operations in Prince Wil- 
liam Sound are curtailed in favor of these more profitable fisheries. 
No weighting to allow for tonnages of the boats operated has been made. Table 
15 shows the number of boats used and the average net tonnages of those vessels of 
which the capacities are known. Although there has been an increase in tonnage per 
boat since 1918, the changes since 1922 have been small and erratic. The efficiency 
