264 ROD AND RIVER 



extraneous substances discharged into the Tweed 

 and which appear to be injurious to the fish ? If 

 so, state the nature of these, etc. 



A. Sewage, paper-mills, dye-works, gas-works, 

 tanneries, woollen manufactories, etc., prevent 

 salmon from entering a river. 



11. Q. When salmon are in the river, do they 

 run up towards the higher parts more at one time 

 than another i.e., at night rather than in the day- 

 time ? When the river is muddy rather than 

 when it is clear ? If so, state when. 



A. Salmon run chiefly at night, when the 

 water is low and clear, but both by day and 

 night when it is in flood or muddy. 



12. Q. It being asserted that salmon go back 

 to the particular rivers where they were bred, and 

 even to the tributaries, state whether such has 

 been ascertained to be the case in regard to any 

 of the fisheries of the Tweed ? 



A. Salmon do return to their native streams, 

 as a general rule, though not invariably. The 

 same may be said regarding sea-trout. 



13. Q. Do salmon, when coming up to spawn, 

 go chiefly in pairs, male and female ? 



A. Salmon, when resorting to any parts of a 

 river or its tributaries, do so in pairs, male and 

 female. 



14. Q. In what month does spawning com- 

 monly begin ? 



