William Brown 
Natural History of the Salmon [PDF ebook] 
As Ascertained by the Recent Experiments; In the Artificial Spawning and Hatching of the Ova and Rearing of the Fry, at Stormontfield, on the Tay

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. Being a believer in the general parr theory, the writer resolved to put Mr Shaw’s statements to the test; and having, in the month of February, 1836, caught a dozen and a-half of parrs in the Tay.