LIST OF ILLUSTRATIONS 



FIG. PAGE 



1. Scales of coalfish of different ages and lengths . . . .23 



2. Baby plaice . . . . . . ' . . .35 



3. Marking experiments from Iceland sho\ving that in the spring 



the mature plaice wander from colder waters (Vopnafiord and 

 .Skjalfandi Bay) to the southern and western shores in order 

 to find suitable spawning conditions ..... 42 



4. The small-plaice grounds ....... 57 



5. Apparatus for hatching turbot ...... 67 



6. Development of the cod . . . . . . . 1) 1 



7. Relative numbers of coalfish and cod at the stage when the tish 



cease to float at the surface with the current, and take to the 

 bottom 101 



8. Baby halibut j^ inch long . . . . . ,. . 105 



9. Newly hatched hake ^ inch long . . . . . .125 



10. Baby hake 0-17 inch (4-5 mm.) long 125 



11. Hake fry, | inch long ........ 125 



12. Development of the ray . . . . . . .131 



13. Egg of ling 136 



14. Ling fry j'^ inch long ........ 136 



15. Baby whiting 0-16 (4-3 mm.) long 141 



16. Babj^ lemon sole 0-25 inch (6-5 mm.) long .... 146 



17. Lemon soles ......... 148 



18. Baby herrings 161 



19. Scales of herring . . . ' . . . . . . 168 



20. Temperature of the North Atlantic at a depth of 55 fathoms . 187 



21. Currents of the North Atlantic 188 



22. Surface temperature of the North Atlantic, Febmary and August 189 



23. Surface temperature of the North Sea in August . . . 190 



24. Surface temperature of the North Sea in February . . . 190 



25. Cladocera or water fleas . . . . . * . .194 



26. Sunshine and mackerel ....... 197 



