055] 



CHAPTER XIII. . 



Pollution of Salmon Rivers Obstructions Fish -passes 

 Salmon-life Extract from Preface of Reports made to 

 the Tweed Commissioners Questions and Answers from 

 Tweed Fishery Reports Summary of Information given in 

 Tweed Fishery Reports Average Rate of Speed of Salmon 

 when ascending Rivers Extraordinary Rate of Speed 

 attained by a Salmon in the Sea Spring Fish and Early 

 Rivers Temperature of Water The Parr The Sewin 

 Local Nomenclature Classification of the Migratory 

 Salmonidae Differences between Varieties of Migratory 

 Salmonidae Care of Salmon Rivers The Value of a 

 River well cared for The Value of Trout Streams The 

 Duties of a Water-keeper Improving a River Weed- 

 cutting on Salmon Rivers A Weed-net. 



UNTIL comparatively recent years, but little has 

 been known regarding the habits of the salmon, 

 and the other varieties of Salmonidae which are 

 migratory. All sorts of wonderful theories and 

 opinions were enunciated from time to time. 

 Thanks to the researches of Buckland and others, 

 who set themselves earnestly to work to learn all 

 that they possibly could of this interesting family, 

 much of the mystery which surrounded it has been 

 cleared up ; and we are now in possession of an 

 amount of valuable information which, if acted 



