GREA T BRITAIN. 41 



Harbour, had a strong barrier of stones placed across the 

 entrance, but through which every tide flowed and ebbed, 

 leaving a sufficiency of water inside. Here mullet, whiting, 

 bream, soles, and plaice, succeeded best ; haddock also did 

 well, but gurnards became pale in colour. Whiting were 

 so tame as to feed out of the hand, and all assembled at the 

 feeding time when the tray appeared. 



Fish likewise occasionally seek refuge in other animals 

 either temporarily or permanently. Mr. Peach at Peterhead 

 observed some very small fishes playing around a medusa 

 when an enemy came near. At once they rushed beneath 

 the umbrella o"f one of these Cyaneae and amongst its 

 tentacles, and there remained in shelter until the danger 

 had passed. Mr. Hardy mentions seeing a boatman cut a 

 medusa across with a knife, when a number of small fish 

 about two inches long were liberated. 



Dr. Andrews observed upon the Holothuria, or trepang 

 of the seas of China, that fish live inside it ; in fact, that he 

 witnessed instances of living fish entering the trepang. The 

 same phenomenon has been observed by Professor Emery 

 at Naples, where a Fierasfer chose for its abode the inside 

 of a Holothuria, invariably entering tail foremost. It 

 evidently obtains a subsistence here. 



Then we occasionally find in our sea examples of the 

 sucking-fish (Echeneis), which attaches itself to sharks or 

 other large animals, in order to profit by the greater powers 

 of locomotion possessed by their host. However, they 

 draw no sustenance, but merely partake of such food as 

 comes within their reach. These fish may be either free or 

 attached to their host, and are termed commensals. 



The importance of our sea fisheries may probably be 

 ranked in point of value in the following order : I. Cod 

 fisheries, including cod, haddock, whiting, ling, coal-fish, and 



