FISHES. 529 



mens of the Finland e insjo forell ' and those which inhabit 

 the lakes of Sweden, Switzerland, and England, under the 

 various synonymes given above, I cannot see the slightest 

 difference.-" 



It was in the lake trout in Bodensjon that Siebold first 

 detected sterility, which among the genus salmo does not 

 appear to be so very uncommon. Dr. Widigren has since 

 conceived that the Wettern's so-called " silfver lax " is no 

 other than a similar sterile form of the " insjo forell " (S.ferox, 

 Jard.), and in every respect agrees with the " insjo forell }) of 

 Boden Ijo, which has always hitherto been considered a good 

 and distinct species, and called 8. lacustris,A.gas8. The sterile 

 form of " insjo forell " may be known by the smarter shape 

 of its body, by the indented tail fin, by the paler body colour 

 (the young are steel blue), a lesser number of spots on the 

 body, and, for the rest, by a general appearance which strongly 

 reminds us of the sea salmon, from which it only differs 

 by the row of strong teeth along the whole vomer. 



The flesh of our Wenerns lax is neither so rich or so 

 red coloured as that of the sea salmon. They take a bait 

 freely, but I never knew one rise to the fly, although they 

 may do so. 



93. SALMO SALAE, Yar. Lacustris, Hard. " Silfver Lax." 



This second species or form of Scandinavian lake trout 

 or salmon (for it is clearly a salmon, and not a trout, like the 

 last), was very common in the Wener, especially in the 

 Biver Klar, where we call it the Degeforss lax, on account 

 of their being captured in immense numbers in the salmon 

 trap at the falls of that place, a few miles up the river. 



It is a more salmon-shaped fish than the last, and is of a 

 bright silvery colour, whence its name. It is a splendid fish, 

 both for sport and the table ; will rise as readily at the fly 

 as a bait ; and although not quite so red, the flesh is very 

 little inferior to that of the sea salmon. In fact, in appear- 

 ance it precisely resembles the salmon trout ; and in form, 

 colour, or general appearance, I could never detect any 

 difference between the sea salmon trout, this silfver lax of 



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