380 'U- S. BUREAU OF FISHERIES 



York Pond {N. If.) substation. — The construction of a commodious extension 

 to the mess camp was begun at this station. In continuation of the extension 

 of the pond and ditch system, several thousand feet of new pipe line were laid 

 to the power house and hatchery and to a proposed new pond. One of the 

 canals was extended and strengthened. Two new ponds were constructed and 

 a third started. New raceways were laid out, and the hatchery capacity was 

 augmented by three new double troughs. 



With regard to fish-cultural work, 1,600,000 brook-trout eggs were collected, 

 which is about three times as many as were taken last year. The brood stock 

 was carried through with virtually no loss. Approximately 10,000 wild fish 

 were caught by hook and line and reserved for future brood stock. Adult 

 fish were removed from the stock ponds with traps, seines, and by the use of 

 quicklime to stupefy them after the ponds had been drawn down. An unusual 

 degree of success attended the rearing of the young fish. It is thought that 

 losses among them were held to a minimum because it was possible to control 

 the temperature of the water by means of a new supply from Cold Brook. At 

 the close of the season many fish were being held in water having a tempera- 

 ture of 65°, with no detrimental effect. Small females were left in the race- 

 ways and allowed to spawn naturally, with the result that a considerable 

 number of fry were secured in this manner. 



Nashua (N. H.) Station 

 (J. D. DeRocher, Superinteodent) 



One of the major items of repair work at this station was the completion of 

 the upi>er supply pond by grading the shores. Part of the pipe line from this 

 pond to the nursery ponds was laid, and a new bass pond was completed with 

 the exception of placing sand and gravel along its margins. The station 

 carried a brood stock of both brook and rainbow trout, and during the fall 

 the former yielded 136,160 eggs while 315,190 eggs were obtained from the lat- 

 ter. A small number of rainbow-trout eggs also was taken from wild fish at 

 the Lebanon (N. H.) collecting station in the spring. Over 1,000,000 brook- 

 trout eggs were obtained from commercial hatcheries and by exchange. 

 Extremely heavy losses were experienced with both the brook and the rain- 

 bow trout, so that the distribution was somewhat limited. However, the distri- 

 bution of the brook trout as a whole for the year was fairly satisfactory, and 

 the fiscal year opened with 522,245 fingerlings No. 2 on hand. There were also 

 almost 100,000 fry and fingerliug rainbows in stock at that time. All fingerlings 

 of both species were distributed in the fall of 1927. During July, 1927, about 

 15,000 smallmouth bass fry wei'e collected from near-by waters. A few catfish 

 also were handled. Almost 10,000 landlocked-salmon fingerlings were on hand 

 at the close of the year. 



COMBINATION TROUT AND POND STATIONS 



The production of warm-water species at this group of five sta- 

 tions is supplemental to the propagation of trout. They are situ- 

 ated near the border line for cold-water fish and consequently meet 

 a demand for fish adapted to widely varying conditions. The indi- 

 vidual reports show that a high rate of production of incompatible 

 species at the same hatchery can not be maintained. 



Erwin (Tenn.) Station 



(A. G. Kkf.skcker, Superintendent) 



During the year the station plant was improved by the construction of 

 approximately 500 feet of concrete wall to protect the pond embankments. Two 

 terra-cotta pipe lines were laid to provide additional water for some of the 

 ponds. The construction of a new highway through the station grounds has 

 caused the surface wash to enter the supply canal and ponds. Wooden outlets 

 and drains were replaced with new ones of concrete. Several thousand cubic 

 feet of mud and filth deposited by this wash were removed from three of the 

 ponds. A new galvanized-iron roof was put on the carpenter shop. While the 

 improvements made during the past year have to some extent offset the damage 



