Fishery bulletin of the Fish and Wildlife Service - NOAA

326 FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE
whitefish occurred in the four districts in which the use of the deep trap net led to an
excessive multiplication of fishing intensity and catch. The decline in the abundance
of whitefish was much less severe in the two districts in which the exploitation of the
stock was more moderate. Further evidence on the harmful effects of deep-trap-net
operations will be brought out by a more detailed consideration of the annual changes
in production, fishing intensity, and abundance in the various districts with reference to
the 1929-1939 averages.
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