ON LAKES, POOLS, ETC. 155 



shall number this fish amongst our Fauna. There is 

 another fish of this class, called the Lavaret, found 

 in the Swiss lakes, which is highly spoken of for the 

 table. It has been asserted by some that it is identical 

 with the Fera — ^by others that it is also identical 

 with the Gwyniad ; but it is, I believe, now decided 

 that it is a separate variety. Carl Voght distia- 

 guishes it from the Fera : (his description of both 

 these fish will be found in the Appendix). 



Unfortunately, the whole tribe of Coregoni are but 

 imperfectly known, and there has hitherto existed 

 considerable difficulty in the way of comparison. 

 One point with regard to them is indisputable — viz., 

 that many of them are very desirable fish to culti- 

 vate, as the food they consume is composed of 

 insects, such as the smaller Coleoptera and the Ento- 

 mostracse. The Coregoni are said to abound in many 

 of the American lakes, and among the most valuable 

 is the Lake Shad, White Fish, or Coregonus Albus. 

 The following is a description of this fish, from 

 Mr. Hunter's work on the Scenery, &c. of the Eastern 

 Townships of Canada : — " Form oval, slightly taper- 

 ing towards the tail; body deep and thick; head 

 pointed, and with the mouth very small; average 

 weight about four pounds. Colour silvery, bluish-grey 

 on the back ; lighter on the sides, and pearly-white on 



