REPORT OF COMMISSIONER OF FISH AND FISHERIES. 43 



DuLUTH Station, Minnesota (R. O. Sweeny, Sr., Superintendent). 



1889-90. 



Operations consisted principally in devt'lopiiij;- eggs transleiied IVoni 

 other stations, though a nuud)er ol'pike ])erch eggs were collected. 



Whitcjish. — About 2(>,250,0(M) whitefisli eggs, in seven consignments 

 of two cases each, received from North ville Station January 4 to .'>!, 

 1800, ]>roduced 24,800,000 fry. Some of the eggs hatched i^rematnrely, 

 owing to the high teini)eiature attained during their transfer, resulting 

 in the release of about 7,000,000 fry from January to March, inclusive, 

 in advance of the normal hatching, which commenced about April 15. 

 The fry were placed in Lake Superior, oft' the month of Lester Itiv^er. 



BrooJc trout. — Eggs to the number of 30,000, received from Xorthville 

 February 3, 1890, began to hatch March 21, and 27,000 fry were released 

 June 12, in Baptism River; 1,000 fry were held over to the succeeding 

 fisciil year for further rearing. 



Lille trout. — 1,000,000 eggs received from Northville January 5, 1890, 

 in four cases, i)roduced 935,000 fry ; of these, 400,000 of premature hatch- 

 ing were li])erated in Lake Superior in April. Tliere were also 300,000 

 released in June. The balance were held for further rearing. The 

 normal hatching of the eggs commenced March 21. 



Loch Leven, trout. — There were 12,000 Loch Leven trout eggs received 

 from Northville February 27, and (rom these 11,000 fry were on hand, 

 in rearing troughs, June 30, 1890. 



Von Behr trout. — Eggs to the number of 8,000 were received from 

 Northville February 27. The fry produced therefrom, and on hand June 

 30, 1890, amounted to 7,280. A consignment of eggs from Oold Spring- 

 Harbor, New York, was without result, they being dead on arrival. 



Jjandloclied aalmon. — There were 48,000 landlocked salmon on hand 

 in troughs and rearing ponds June .'>(), 1890, which were the i»roduct of 

 60,000 eggs received from Schoodic Station in March. 



PlJce perch. — On May 5, 1890, 600,000 pike perch eggs were collected, 

 the fry X)roduced therefi'om amounting to 580,000, which were released 

 May 9 to 25, at the mouth of Lester Eiver. 



The water temperature, after remaining at 32° F. for four months, 

 rose to 34*^ April 10, 1890, the mean morning temperature during A])ril 

 being 34j\rO, .,,,,x during May 45-'^, In February the mean air temi>era- 

 ture was 12i°, maximum lO*^, and minimum 16° beloAv zero. 



1890-91. 



During this year many improvements were nmde looking to the com- 

 pletion of the station. In conseijuence of the denudation of the land 

 areas along Lester Kiver (caused by disastrous forest tires, the opera- 

 tions of lumbermen, and the clearing incident to the suburban growth 

 of the city of Duluth) it was Ibund that the gravity supply of water to 

 the hatchery from that stream could no longer be relied upon. When 

 the hard freezing weather occurred the stream was dried u}), and the 

 lake was drawn upon, water being obtained by pumping. 



