446 PRESENT STATE OF THE GRIMSBY TRAWL FISHERY. 
fish which cannot be protected by the size-limit method. Artificial 
propagation must, to be really useful, include not only the hatching 
of the eggs but the rearing of the fry through the pelagic stages, 
and must most certainly be preceded by such measures for the pro- 
tection of the young, as would very probably render it entirely un- 
necessary to embark on this very costly undertaking. 
