Premium
Classification of Fish‐Cultural Products and Methods of Determining the Numbers of Fish Contained in Individual Allotments
Author(s) -
Rodd James A.,
Stapledon Charles F.
Publication year - 1942
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1941)71[290:cofpam]2.0.co;2
Subject(s) - fish <actinopterygii> , fishery , significant difference , statistics , mathematics , biology
According to published reports and information furnished in response to questionnaires distributed in 1940, there is considerable difference in the age or length of fish listed under the various classifications used by fish‐cultural agencies in the United States and Canada. There also is considerable difference in the methods employed to compute the number of fish in individual allotments and to determine seasonal production. The classification “fry” has ten different meanings and the term “advanced fry” six meanings. The classification “fingerlings” refers to ten stages of development. Fingerlings also are classified according to number, length, or age. The numbers of fry contained in individual allotments are calculated in six different ways and the number of fingerlings by five different methods. Some methods are as accurate as is reasonably possible, while the accuracy of computations based on egg measurements and deductions of observed losses are affected by the extent of the “invisible” losses and the efficiency of the individual making the computations.