File:Report of the Commissioner for the year ending June 30, 1902 (1904) (14781382451).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
Subjects:
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Contributing Library: Clemson University Libraries
Digitizing Sponsor: LYRASIS Members and Sloan Foundation

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r-oil or less pure oil as it settles and conducts itto near the top of the second vat, where the oil and water are furtherseparated. At the bottom of each settling tank is deposited a quantity of finely-divided fleshy,substance known as gurry. This is removed fromthe tanks to the gurry room, where it is treated or sprinkled withsulphuric acid to facilitate the separation of the oil from the fleshfiber. It is then placed in bags, 2 gallons to the bag, and these placedin pairs under a press and subjected to great pressure, resulting in asmall quantity of oil.- The residuum in the bags, consisting of a hardcake, is broken up and either discarded or mixed with the scrap. When thoroughly separated from the water, the oil is pumped intosuitable storage tanks or barreled. The refining or bleacliing of theoil is rarely done at the factories, but is j)erformed by tlie oil-refinersof New York, New Bedford, Boston, etc., and the methods and resultshave already been described on p. 234. Plate 22.
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AQUATIC PRODUCTS AS FERTILIZERS. 265 The yield of oil varies greatly, ranging from less than 1 pint to asmuch as 15 gallons or more per thousand fish, or rather for each 22,000cubic inches of lisli. As a rule, it is much greater in the autumn thanin the spring, and also greater in Northern than in Southern localities.Even in the same locality the fish are very much fatter throughoutsome years than in others. For instance, the average jdeld of thefish taken in Chesapeake Bay in 1887 was nearly 6 gallons to thethousand, whereas in 1888 it was a little over 2 gallons, and early inthat season it was less than 1 pint to the thousand fish. Some j^earsago one of the Shelter Island factories secured from one lot of fish ayield of 24 gallons to the thousand. The largest yield brought to thenotice of the writer was derived from some menhaden that had beeninclosed in Shinnecock Bay late in autumn. By feeding in the brack-ish water of that bay these became so fat that they yielded at therate of 4

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