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DEFINITION
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A group of individuals of the same age range in a population. The 0 group are the fish in their first year of life. A fish born in April of a given year, remains in the 0 group until April of the following year. The term usually refers to a year class in long-lived annually breeding species, but shorter units of time are also used, particularly in the tropics.
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Other Definitions
All of the fish in a stock that are a particular age, such as all the 3-year-olds. |
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Gough, J. and T. Kenchington (1995), A Glossary of Fisheries Science. Communications Branch, DFO, Nova Scotia
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A group of individuals of the same age range in a population. This term usually refers to a year class in long-lived annually breeding species, but shorter units of time are also used. |
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Cooke, J.G. (1984), Glossary of technical terms. In Exploitation of Marine Communities, R.M. May (ed), Springer-Verlag
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The group of fish at a given age. 0 group fish are fish in the first year of life; I group fish are fish in the second year of life; II group fish are fish in the third year of life. A fish born on 1 April remains in the 0 group until 1 April in the subsequent year, after which it is allocated to the I group, II group, etc. |
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Cushing, D.H. (1968): A study in population dynamics. The University of Wisconsin Press
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| RELATED TERMS |
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Year class
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| ALTERNATE SPELLING |
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no alternate spelling
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