T7 



white with a tinge of yellow, sometimes pink, accord- 

 ing to surroundings, less delicate than that of the Cal- 

 ifornia salmon. It spawns in April. 



Third : The Brook Trout, or Salmo foiitiiialis. 

 Its form resembles that of the trout ; it is a very 

 pretty fish. Its fins are margined w4th white, which, 

 with its dark sides, spotted with white, give it a strik- 

 ing resemblance to the onibre-chevalier. Like the rain- 

 bow trout it does not reach a great size. 



These three kinds of fish have been made the sub- 

 ject of many experiments in the Trocadero Aquarium. 

 I have studied their habits, their characteristics, in 

 order to appreciate their qualities and their advantages, 

 and have endeavored to learn thoroughly their repro- 

 duction and rearing. 



The qualities which radically distinguish these 

 species from our native Salmonidse are important. 



First, their growth is more rapid. It is possible in 

 ten months to bring them to a weight of three hundred 

 grams. At three years they may measure twenty- 

 eight to thirt3^-two inches and weigh from thirteen to 

 fifteen pounds. They do not offer any difficulties on 

 account of purity of the water, and accept surroundings 

 to which our trout would not submit. They endure 

 high temperature ; they will live in roily water of a 

 temperature of 25° centigrade, while the trout suc- 

 cumbs at 18°. Fiually, these salmon, in spite of their 

 name of salmon, are not obliged to go to sea to prepare 

 for their reproduction. They can live and reproduce 

 in fresh water. So, although zoologically they are 

 salmon, from the culinary standpoint they are trout. 



It is true that in California Salmo qiiinnat descends 

 the Sacramento, but this journey is not obligatory. In 

 the tanks of the Trocadero the quinnat reproduces 

 wonderfully, and after five generations its spawning is 

 today as ample as at the beginning. 



In studying their equalities I have observed among 



