5 



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 trout! ess 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 ol 

 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. Levenensis, 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 is, 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 



