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11-08-2010, 02:52 PM #1
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Comparison of age-structured and length-converted catch curves of brown trout Salmo t
By D. Pauly, J. Moreau, N. Abad
Fisheries Research, Volume 22, Issues 3-4, March 1995, Pages 197-204, ISSN 0165-7836, DOI: 10.1016/0165-7836(94)00323-O.
Age-structured catch curves (ACC) and two different types of length-converted catch curves (LCC), covering the same size/age range of trout Salmo trutta (Pisces: Salmonidae) in two French rivers, were used to estimate total mortality (Z). It is shown that standard LCC overestimate Z when ACC are used as controls, while LCC explicitly considering seasonal growth oscillations produce unbiased estimates. The implications of this finding for length-based fish stock assessment are discussed.
Keywords: Age distribution; Length distribution; Mortality; Salmo trutta