APPENDIX* 195 



supposed they revisit the sea, they again become 

 scarce ; and the next season they are taken as 

 perfect salmon of nine pounds and upwards, few 

 of them, in the opinion of experienced fishermen, 

 attaining a weight of nine pounds the first year. 

 The following account of the number of salmon and 

 grilse caught in the river Ness, Inverness-shire, 

 may afford some idea of their comparative abun- 

 dance in most of the rivers of Scotland and the 

 north of England which they frequent, during the 

 respective months. From December to May no 

 grilse were taken in the Ness, in any of the years. 

 1812. 1813. 1814. 



Salmon. Grilse. Salmon. Grilse. Salmon. Grilse. 



June . 6 39 18 27 69 180 



July . 25 211 38 208 21 263 



August 236 1361 318 700 221 710 

 Sept. . 77 482 74 169 15 97 



The total caught in each of these four months, for 

 three years, is : 



Salmon. Grilse. 



In June . 93 246 



July . 84 682 



August 775 2771 



Sept. . 166 748 



Salmon on their return from the sea are found 

 with an insect, the Monoculus Piscinus, or sea- 

 louse, adhering to their sides and shoulders, but 

 which falls off after they have been a short time in 

 fresh water. They are also infested with an insect 

 like a maggot, the Lernea Salmonea, which lodges in 

 and destroys their gills, and which is said only to be 



