Report of the Danish Biological Station to the Ministry of Shipping and Fishing . not so much in danger of the starfish es(Asterias), as the latter ordinarily only get time to suck at them outside on theskin, but they also might kill the fish. It can readily be understood, thatthe whelks do an immense amount of harm in waters where the fishery and prices are based on the capture of living plaice, especially when thefish are caught in nets wbich stand for many hours (not in seines), in accordancewith the bye-laws of the Limfjord for the greater part of tlie year. In the caseof tlie trawls, whie
Report of the Danish Biological Station to the Ministry of Shipping and Fishing . not so much in danger of the starfish es(Asterias), as the latter ordinarily only get time to suck at them outside on theskin, but they also might kill the fish. It can readily be understood, thatthe whelks do an immense amount of harm in waters where the fishery and prices are based on the capture of living plaice, especially when thefish are caught in nets wbich stand for many hours (not in seines), in accordancewith the bye-laws of the Limfjord for the greater part of tlie year. In the caseof tlie trawls, whieh are quickly drawn up, the whelks do not get time to attackthe plaice; but the trawl has other drawbacks, which, however, need not be furtherdiscussed on this occasion. The whelks find the plaice and their food on the whole by means of theirlinely developed seuse of smell. They also attack all other fishes fixed in the nets;in a few hours 10—20 whelks will often fix themselves on to a plaice or otherdead fish on the bottora of the sea. The whelks are so uumerous, that some. Fig. 2. hundreds, both large and small, can be fished in 24 hours in a hivetrap witha piece of split cod as bait. We may imagine, that in the centre of the Limfjordseveral whelks occur on an area no larger thau the floor of a room; as they areable to crawl rather rapidly, we can understand how, in the course of a few hours,they might easily find a dead fish lying on the bottom and devour the the other hånd, they will not touch rotten fish; experiments with soiled baitin the hive-traps have clearly proved this. Sometimes dead fishes can be foundin numbers on the bottom of the Limfjord; this was the case in 1909 in the spring,when a great number of eels had been frozen dead in the wiuter; they were rottenbefore the whelks had any desire to feed, but I have never seen auythiug similarin the summer; everything eatable which siuks to the bottom is evideutlj quicklydevoured at that season. It is ver
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