336 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



Appliances for striking-: One series of eel spears, two frostfish spears, three crab 

 and flounder sjjears, one five-pronged grain, oue concli harpoon, one 

 turtle peg harpoon, one series of Indian fish spears, oni^ series of sword- 

 fish dart heads, two porpoise harpoons, two porpoise lances. 

 Illustrations of fisheries: 



Four pictures illustrating the seal fisliery. 



One picture of Aleuts killing walrus. 



One picture of salmon trap (Indians of Northwest). 



One picture of Marsh's improved deep-water oyster tongs. 



Thirty-five swinging screens eontaining views of the difi"erent fisheries, U. S. 

 Fish Commission stations, eqnipments of steamers Albatross and Fish 

 Hawk, and plates from U. S. Fish Commission Bulletins. 



PRACTICAL FISn-CULTURE. 



During^ the montns of May and June 3,500,000 shad eggs were received 

 from the Susquehanna, Delaware, and Potomac rivers by express and 

 hatched in apparatus provided for illustrating practical fish-cultural 

 work. Of the fry resulting, 1,400,000 were liberated in the Cumber- 

 land River and 215,000 were held until July for exhibit. Besides the 

 black-spotted and rainbow trout eggs from Colorado, received in June, 

 20,000 eggs of the quinnat salmon were shipped from California during 

 the fall months. These eggs were hatched in water from the artesian 

 well, and the fry were placed on exhibition and planted in suitable 

 waters in the vicinity. This feature of the exhibit was particularly 

 interesting to the people of that section of the country, as it was the 

 first time that the eggs of any of the Salmonidte had been artificially 

 hatched in Tennessee. This was only rendered possible by the sinking 

 of a well near the Government building, which furnished an excellent 

 flow of water at 59° throughout the summer. 



THE AQUARIUM. 



The aquarium was a grotto-like, L-shaped structure, 120 feet long and 

 28 feet wide, containing 22 tanks, arranged in equal numbers on each 

 side of the passageway 12 feet wide. Each tank was 7 feet long, 3 

 feet high, and 5 feet wide at the top, with a capacity of 55 gallons. The 

 tanks next to the wall were arranged for the exhibition of the various 

 fresh-water species; those upon the opposite side were placed for the 

 exhibition of salt-water species, which included snappers, groupers, 

 pompano, crevalle, mullet, ami other bright-colored tropical fishes, as 

 well as the crustaceans, shellfish, etc. 



The water for the fresh-water aijuaria was obtained from a well 84 

 feet deep located near the southeast corner of the buildiug, which per- 

 mitted the exhibition of a number of specimens of rainbow and brook 

 trout and steelhead trout throughout the exposition. 



The water in the salt-water tanks was brought from Morehead City, 

 N. C, in tank cars, and stored in a large reservoir- beneath the fioor; 

 from this it was forced by means of nickel pumps, driven by electricity, 

 into a smaller tank located 18 feet above the Hoor, whence it passed by 

 gravity to the aquarium, thence returning to the reservoir. 



The interior of the grotto was lighted through tlie aquarium tanks 

 and a number of ventilators, placed in the crown of the grotto arch. 

 It was finished in adamant and cement, partly as stuccowork, partly 



