File:Report of the Commissioner for the year ending June 30, 1902 (1904) (14598015337).jpg

Identifier: reportofcommissi001902 (find matches)
Title: Report of the Commissioner for the year ending June 30, 1902
Year: 1904 (1900s)
Authors: United States Comission of Fish and Fisheries
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Contributing Library: Clemson University Libraries
Digitizing Sponsor: LYRASIS Members and Sloan Foundation

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0,000 pounds, or 112,500 tons. While this is a very large amountin the aggregate, it is so widely distributed that the quantity at anyone place is not of great importance, and usually its disposal is asanitary problem rather than a source of revenue. In dressing fish atsea the waste is almost invariably thrown overboard. In the cities thismaterial is usually combined Avitli and handled in thc^ same way asother market refuse. At the canneries where large quantities of fishare dressed, as in the salmon canneries of the Pacific coast, and thesardine canneries of Maine, the refuse is now in many cases ren-dered into oil and fertilizer. This has already been noted in thechai^ter on the preparation of oils from waste products in the fisheries.(See pp. 240-242). In case the fish dressings contain little oil the inducements forutilizing them are not great. Water constitutes a very large propor-tion of the viscera, the quantity ranging from 65 to 90 per cent, Report U. S. F. C. 1902. Plate 24.
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AQUATIC PRODUCTS AS FERTILIZERS. 271 according to the species and the season. Even when the moisture islargely removed the quantity of fertilizing substances in the driedmaterial is small. However, if the quantity of oil in the waste issufficient to pay the cost of its extraction, it is usually profitable toperform the slight additional labor necessary to make the materialsuitable for fertilizer. The manurial content of fish heads is rela-tively large, and whenever they are accumulated in large quantitiestheir conversion into fertilizer is profitable. A convenient process of converting a small quantity of refuse fromdressing fisli into fertilizer is to store it in a receptacle made in theground. This should be about 5 or 0 feet deep, with the area depend-ing on the amount of refuse, but usually about 0 feet square. Itshould be d)\y and if tlie soil is sandy some clay should be spread atthe bottom. First is placed a laj^er of wood ashes a few inches deepand then an equal laj^er of fish

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