File:A manual of fish-culture, based on the methods of the United States commission of fish and fisheries (1897) (14577631688).jpg

Identifier: manualoffishcult00unit (find matches)
Title: A manual of fish-culture, based on the methods of the United States commission of fish and fisheries
Year: 1897 (1890s)
Authors: United States. Bureau of Fisheries Brice, John J. (from old catalog) Moore, H. F. (Henry Frank), 1867-1948 Chamberlain, F. M. (Frederick M.)
Subjects: Fish culture Oyster culture Frogs
Publisher: Washington, Govt. print. off.
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
ir experience and size will enable them to take a minnow oranything that may present itself in the shape of food. In the Eastern States fry should not be planted in open waters untilthey are several months old, and then not until the temperature of thestreams begins to rise; but fish hatched in December and January cansafely be planted in April and May. On the Pacific slope the fry maybe successfully liberated at any time after the umbilical sac is absorbed. SIZE AND GROWTH. The size of the rainbow trout depends upon its surroundings, thevolume and temperature of the water, and the amount of food it con-tains. The average weight of those caught from streams in the East isprobably less than a pound, but some weighing 6§ pounds have beentaken. In the Ozark region of Missouri they are caught weighing 5 to10 pounds. In some of the cold mountain streams of Colorado theiraverage weight is not more than 6 or 8 ounces, but in lakes in the Report U. S. F. C. 1897. (To face page 73.) Plate 21.
Text Appearing After Image:
MANUAL OF FISH-CULTURE. 73 same State, where the water becomes moderately warm in summerand food is plentiful, they reach 12 or 13 pounds, fish of this size beingfrom 25 to 28 inches long. In the Au Sable Eiver, in Michigan, theyattain a weight of 5 to 7 pounds. In their native streams of Californiathey are often caught ranging from 3 to 10 pounds, but average from1 to 2 pounds. The largest specimen ever produced in the ponds atWytheville, and fed artificially, weighed 6£ pounds, but many others inthe same ponds weigh from 1 to 3 pounds. The average growth of the rainbow trout under favorable artificialcircumstances is as follows: One year old, from f to 1 ounce; 2 yearsold, from 8 to 10 ounces; 3 years old, from 1 to 2 pounds; 4 years old,from 2 to 3 pounds. They grow until they are 8 or 10 years old, therate diminishing with age. Some grow much faster than others underthe same circumstances, but the rate of growth is largely a question offood, temperature of water, and extent of th

Note About Images