EFFECT OF TEMPERATURE ON SALMON. 105 



having taken out a yard of line. When the tem- 

 perature gets warm in July and August, the fish 

 always become very sulky. This is generally the 

 time of year when the temperature of the water in 

 all our rivers is at its maximum heioht, when fish 

 refuse the most tempting lures, and although the 

 angler may have cast his flies in the most artistic 

 manner over thousands of clean-run fish, he will 

 as often as not go home with an empty creel. 

 On one occasion, when fishing the Lyngdal in the 

 South of Norway, down which river snow-water 

 never flows after the beginning of June, my friend 

 and I killed eleven fish one day in July, when the 

 fish were plentiful, and the water in first-rate order ; 

 but during the following night the weather changed 

 from temperate to very warm. The next day the 

 thermometer stood at 84° in the shade ; the fish 

 left off feeding, and we caught no more until the 

 weather changed again and became colder. But 

 although in hot weather, such as I have described, 

 the temperature of the water will invariably become 



