List of Illustrations. 



Plate I. A Sea-Trout (in Colour) Frontispiece 



Face page 



„ II. Development of the Salmon from the Egg to the Smolt 



Stage (in Colour) 7^ 



„ Hi. Development of the Sea-Trout from the Egg to the Smolt 



Stage (in Colour) 7^ 



„ IV. A Trout, a Loch Leven Trout, a Sea-Trout, and a Salmon 



as "Yearlings" (in Colour) 9^ 



„ V. A Trout, a Loch Leven Trout, a Sea-Trout, and a Salmon 



as " Two Year Olds " (in Colour) - - - - 94 



„ VI. A Silvery Loch Lomond Trout (in Colour) - - ■ 100 



„ VII. A Young Salmon assuming the Smolt Dress (in Colour) loi 



„ VIII. An Exceptionally Large Sea-Trout Smolt (in Colour) - 104 

 „ IX. A Spawning Male Sea-Trout (in Colour) - - -159 



" Fresh Run from the Sea " Face page 40 



FIG. 



1. A Salmon, showing normal spots of the " maiden " fish - - 42 



2. A Salmon, showing speckled appearance of a fish which has 



previously spawned '42 



3. Two Loch Lomond Sea-trout, showing typically distinctive 



markings 44 



4. A male Sea-trout at spawning time 44 



5. A "two year old" Trout (fario) with "halo" surrounding the 



spots strongly accentuated 46 



6. Two " two year old " Trout (fario) showing normal markings • 46 



7. A Norwegian river Trout {fario) 47 



8. A Clyde river Trout (fario) 47 



9. A Loch Lomond Trout (/ano)showingspotsgeometrically arranged 48 



10. A Loch Lomond Sea-trout showing spots geometrically arranged 48 



11. Diagram showing arrangement of the fins of Salmon, Sea-trout 



and Trout ^4 



12. Diagram contrasting tails of Salmon and Sea-trout - - -55 



13. Diagram contrasting heads of male Salmon and Sea-trout - - 58 



ix 



