Before concluding this chapter I wish to say a few words about a point of herring economy, which has been already alluded to in connection with the special commission appointed to inquire into the trawling system—viz. as to the natural enemies of the herring, the most ruthless of which are undoubtedly of the fish kind, and whose destructive power, some people assert, dwarfs into insignificance all that man can do against the fish:—“Consider,” say the commissioners, “the destruction of large herring by cod and ling alone. It is a very common thing to find a codfish with six or seven large herrings, of which not one has remained long enough to be digested, in his stomach. If, in order to be safe, we allow a codfish only two herrings _per diem_, and let him feed on herrings for only seven months in the year, then we have 420 herring as his allowance during that time; and fifty codfish will equal one fisherman in destructive power. But the quantity of cod and ling taken in 1861, and registered by the Fishery Board, was over 80,000 cwts. On an average thirty codfish go to one cwt. of dried fish. Hence, at least 2,400,000 will equal 48,000 fishermen. In other words, the cod and ling caught on the Scotch coasts in 1861, if they had been left in the water, would have caught as many herring as a number of fishermen _equal to all those in Scotland, and six thousand more_, in the same year; and as the cod and ling caught were certainly not one tithe part of those left behind, we may fairly estimate the destruction of herring by these voracious fish alone as at least ten times as great as that effected by all the fishermen put together.” As to only one of the numerous land enemies of the herring, the late Mr. Wilson, in his _Tour round Scotland_, calculated that the gannets or solan geese frequenting one island alone—St. Kilda—picked out of the water for their food 214 millions of herrings every summer! The shoals that can withstand these destructive agencies must indeed be vast, especially when taken in connection with the millions of herrings that are accidentally killed by the nets, and never brought ashore for food purposes. The work accomplished by these natural enemies of the herring, which has been going on during all time, does not however affect my argument, that by the concentration on one shoal of a thousand boats per annum, with an annually-increasing net-power, we both so weaken and frighten the shoal that it becomes in time unproductive. As the late Mr. Methuen said in one of his addresses: “We have been told that we are to have dominion over the fish of the sea, but dominion does not mean extermination.”