540 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



[2] 



course, that it meets all the necessary requirements of purity, nutritive 

 substances, sufficient aeration, and suitable temperature. 



Spring water, which does not contain mineral substances, is to be 

 specially recommended for hatching, provided it is not so warm as to 

 exceed 10° C. [50° Fahr.J ; as owing to its even temperature it appears 

 cool in summer and warm in winter. 



On the other hand, brook water commends itself, because generally 

 it is easy to obtain, and contains a good deal of air, in which latter 

 respect it is excelled by river water, which is well adapted to the pur- 

 pose, if it does not carry too much mud. In northern countries, how- 

 ever, this water is apt to freeze. 



In view of the above it will not seem strange that the fust request 

 which I made of the directors of the establishments visited by me was 

 to inform me in relation to the quality of the water employed by them. 

 I have below tabulated their statements regarding the quality and tem- 

 perature of the w T ater employed in their hatcheries. 



Establishments in which only spring water is used, which rises in close proximity to the 



hatching chambers. 



Establishments in which spring water, brook water, or river water, cither each by itself or 



mixed, is used. 



Selzenbof. 

 Seewieso.. 



Several springs which rise in the extreme 

 southwest of the territory occupied by the 

 establishment ; a portion of their water 

 being led to the hatcheries through pipes, 

 2,950 feet long. 



Rhine water from a canal connecting the 

 Rhone and the Rhino, led into the inelosure, 

 and brought into the hatching houses by 

 means of turbines. 



A spring at a short distance 



Water from a brook which rises at the dis- 

 tance of half an honr. 



Several springs rising within the inelosure 

 of tho establishment. 



Water from the brook called " Fisehbach," a 

 tributary of tho river Saalo. 



A mixture of the two waters 



* In the official report, " Notice historique sur I'JStablissement de Huningue," Strasburg, 18fi2, it is 

 stated that the temperature of the springs is even, but during the winter 1884-'85 very noticeable var- 

 iations of temperature were observed. The only mention made of such variations in said report is 

 that of 1856, during the winter of 'Which year the temperature fed I to zero. 



