FISHES FROM THE SEA-BOTTOM 



439 



a species would be based on material containing information 

 as to how many individuals of the species live in different 

 sections of the area, and a complete knowledge of an animal- 

 community would be to have information as to the exact 

 relative occurrence of the animals. 



In regard to no species, however, does our present knowledge 

 comply with this ideal demand. As regards the fishes we have 



Fir,. ^11. — Steam-Trawlers laid up in Grimsby during Engineers' Lock-out. 



most information on the species of economic importance, for In 

 recent years many fishing experiments have been made with the 

 object of ascertaining what quantities of fish occur in different 

 waters. In co-operation with the International Council for the Fishery 

 study of the sea, the fishery statistics of several countries have ^^^^'^^^^^ 

 also been so far improved, that the quantities of fish landed are 

 now separated in regard to species and areas where caught. 

 The quantities landed are certainly not on the whole repre- 



