72 U. S. BUREAU OF FISHEKIES. 



a tent hatchery was installed on the run that is being converted into 

 rearing race No. 3, and here the eggs were successfully held until 

 the hatchery could be made ready to receive them. 



The hatchery water-supply proved well adapted to trout incuba- 

 tion except that it contained large quantities of brown and green 

 algffi, which gave serious trouble even though the eggs were mostly 

 in an advanced stage when removed to the hatchery. After some 

 losses and some experimenting it was discovered that the bad eii'ects 

 of the algse might be overcome by placing the eggs, when just about 

 to hatch, in the normal salt solution. Contact with the alga3 ap- 

 peared to toughen the shell so that the fish could not entirely emerge 

 from it and the effect of the solution was to counteract the difficulty 

 and restore the shell to its normal condition. 



With the exception of 5,000 eggs planted in gravel in small brooks 

 on the reservation no distributions of stock were made. All fish 

 hatched were removed as sac-absorbed fry to the races, where they 

 readily adapted themselves to their environment and began feeding 

 readily. In addition to the fish hatched at the substation 77,000 

 brook trout and approximately 11,000 landlocked salmon were trans- 

 ferred from the St. Johnsbury hatcher}-. 



NASHUA (N. H.) STATION. 



[Waldo F. Hubbard, Superintendent.] 



The year's output from this station consisted of 675,000 fingerling 

 fish divided as to species among the brook trout, rainbow trout, lake 

 trout, and landlocked salmon; also 83,700 fry of the pike perch and 

 smallmouth black bass. As in past years, most of these fish were 

 the product of eggs forwarded to Nashua from other sources, the 

 only brood fish maintained at the station being a few each of the 

 brook trout and rainbow trout, which yielded 127,950 and 83,550 

 eggs, respectively. This stock was augmented during the winter by 

 the purchase of 795.000 brook-trout eggs from a conunercial fish 

 culturist and the transfer of 50,000 rainbow eggs from the Wliite 

 Sulphur Springs (W. Va.) station. Heavy losses of both species 

 were sustained in the egg and fry stages, greatly curtailing the dis- 

 tributions. Other transfers of eggs included 46,000 of the lake trout 

 taken in connection with the field work of the St. Johnsbury (Vt.) 

 station, 21,000 landlocked-salmon eggs shipped from the Craig Brook 

 (Me.) station, and 1,500,000 eyed pike-perch eggs from Put in Bay, 

 Ohio. Owing to a protracted delay in delivery the latter consign- 

 ment was received in poor condition and yielded onl}^ 75,000 fry. 

 The salmon eggs were successfully hatched and most of the resulting 

 fingerlings were being held for later distribution at the close of the 

 year. 



An attempt during the first half of June to collect smallmouth 

 black-bass fry from Lake Sunapee, N. H., for supplying applicants 

 in that region was almost a failure, only 8,700 being secured. The 

 outcome of such work in the Lake Sunapee field is very largely 

 dependent upon weather conditions. If it is windy, as it is very 

 likely to be, great difficulty is experienced in locating the nests and 

 collecting the fry. Much trouble has also been encountered in hold- 

 ing the collections of fry even for the period of a day without in- 

 curring large losses. 



