era 
of the newly spawned eggs, which are found floating over the spawning grounds. In 
this manner, the International Investigations have studied the spawning grounds of 
the cod, the plaice, and other fish, and have succeeded in showing that the area of occur- 
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Fig. 3. Animals caught over great depths in the Norwegian Sea. 
The isobaths represent depths of 100, 200, and 500 fathoms. 
EG) Haddock 
O Sebastes © Cyclopterus 
@ Cephalopoda x Herrings ) Anarrhicas 
© Lamna + Cod C Greenland shark 
®& Acanthias N Gadus virens © Mackerel 
rence of all the most important species is confined, m spawning time, (the principal fishing 
season) to the coastal banks, in many cases to certain comparatively small parts of these. 
The young stages also, — fish in their first years of life, — are easily caught. We have there- 
fore a great deal of reliable material available as to the area of distribution of the fish 
