Age and growth studies of chondrichthyan fishes: the need for consistency in terminology, verification, validation, and growth function fitting |
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Authors: | Gregor M. Cailliet Wade D. Smith Henry F. Mollet Kenneth J. Goldman |
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Affiliation: | (1) Moss Landing Marine Laboratories, 8272 Moss Landing Road, Moss Landing, CA 95039, USA;(2) Alaska Department of Fish and Game, 3298 Douglas Place, Homer, AK 99603, USA |
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Abstract: | Validated age and growth estimates are important for constructing age-structured population dynamic models of chondrichthyan fishes, especially those which are exploited. We review age and growth studies of chondrichthyan fishes, using 28 recent studies to identify areas where improvements can be made in describing the characteristics of ageing structures (both traditional and novel) utilized to estimate ages of sharks, rays, and chimaeras. The topics identified that need consistency include the: (1) terminology used to describe growth features; (2) methods used to both verify and validate age estimates from chondrichthyan calcified structures, especially edge and marginal increment analyses; and (3) the functions used to produce and describe growth parameters, stressing the incorporation of size at birth (L 0) and multiple functions to characterize growth characteristics, age at maturity and longevity. |
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Keywords: | Age validation Precision analysis Chondrichthyes Growth Longevity Vertebrae |
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