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Autor  |
Mohn, R. |
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Titel |
Length-Based Virtual Population Analysis; A Review and Swordfish Example |
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Zeitschrift, Artikel |
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Jahr |
1991 |
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ICCAT Working Document |
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Fischerei, population, cpue, lÄngenfrequenz, wachstum, modell, statistik |
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Zusammenfassung |
Length-based population analyses have had a fairly long but not too successful history. These methods are required over a range of situations from when aging is impossible to when it is difficult or prohibitively expensive. There have been 3 sorts of approaches: 1) modal analysis to convert length frequencies to ages 2) age-length key enhancement and 3) imbedded growth models. The last group is what is generally known as length-based methods and the focus of this review. At the 1991 ICES Methods Working Group, 5 techniques were compared and these results are summarized. Two of these techniques, cohort slicing and length-based ADAPT, are applied to swordfish (Xiphias gladius ) data. The imbedded growth model for the former technique is the mean size at age while the latter uses the distribution of size at age. A new method is also presented which begins with cohort slicing then estimates numbers at age and enhances an inferred age-length key at each step of an iterative process. |
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nein |
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Rufnummer |
414 |
Signatur |
2218 |
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