18 
but we must not conclude that the acclimatisation of every 
species is in all cases desirable, for if the Black Bass were 
introduced into the Tay, and the Pike Perch allowed to 
sport wherever he listed, even were the sport with the new 
comers at all commensurate with the highly-coloured 
descriptions which we have read, it will hardly compensate 
for a troutless river, and a salmonless estuary. There may 
be parts of the country where the Pike Perch would form. 
a desirable addition to the local fauna, but I cannot conceive 
the Black Bass, who is only at his best in waters essentially 
fitted for Salmonidae, to be other than a most dangerous 
intruder. The Colorado beetle boasts, I believe, of a special 
Act of Parliament, and I do think the introduction ot 
strange and dangerous species of fish should only be 
attempted under State control. 
The S. Sebago, should he retain in this country his non- 
migratory instincts, would probably be a splendid fish for 
the Thames, and if used in the upper parts of the Severn 
would introduce a new and important element in the 
question of the respective rights of upper and lower pro- 
prietors. It is not for the public good that this should be 
done, for this fish would probably be able to hold the 
spawning grounds from all comers, and a rapid decrease of 
the migratory species would be the result, and if it be urged 
that a lake species would not localize itself to the upper 
portions of our larger rivers, still if crossed with a British 
variety, such as S. Levenenses, it in all probability would 
do so. The acclimatization of the Corregoni, of which there 
are many species, all of which can be easily transported as 
alevins in my opinion, only to be considered as a factor in 
the production of food for more valuable Salmonidae. If 
we had the great American lakes, no doubt the large white 
fish of Canada would, if introduced, form a valuable article 
