LIST OF ILLUSTRATIONS ix 



Facing page 



smelt ..... 



rainbow trout 



brown trout 



hatching of the salmon 



brown trout two weeks old 



brown trout five weeks old 



salmon fry, seven weeks old showing early parr marks 



life of a salmon as read by the scale 1. 



life of a salmon as read by the scale ii 



sea trout, photographed by front light, showing its 



silvery body 

 rainbow trout. the silvery body reflecting the colour 



of the water ....... 



rainbow trout as seen in the pond .... 



a rise as seen from below the surface of the water 

 throat teeth of the carp ...... 



THE CARP ......... 



MOUTH OF THE CARP ....... 



THE GOLD FISH . . . . . . . 



WATER SUPPLY AND BOX USED FOR REARING ROACH 

 THROAT TEETH OF CHUB ...... 



CARP, HATCHED SIX HOURS ...... 



SWIM-BLADDER OF CRUCIAN CARP ..... 



FIRST TWO DAYS IN THE LIFE OF A ROACH 



GROWTH OF SWIM-BLADDER : ROACH .... 



NEWLY HATCHED PLAICE ...... 



PLAICE, HATCHING HEAD FIRST ..... 



PLAICE, HATCHING TAIL FIRST. ..... 



PLAICE ENLARGING RENT IN THE EGG MEMBRANE 



PLAICE, NEWLY HATCHED ...... 



PLAICE, EIGHT DAYS OLD ...... 



STAGES IN THE TRANSFORMATION OF THE PLAICE, SHOWING HOW 



THE FISH BECOMES FLAT AND THE LEFT EYE IS CARRIED OVER 

 ADULT PLAICE ......... 



POOLS THAT HOLD YOUNG FLAT FISH ..... 



HOW TO READ THE AGE OF A PLAICE BY THE RINGS ON THE OTOLITHS 



OR EAR-STONES ........ 



THE COMMON SEA URCHIN ...... 



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