Length-weight relationship of marine fishes from southern Brazil

Haimovici, M. and Velasco, G. (2000) Length-weight relationship of marine fishes from southern Brazil. Naga, the ICLARM Quarterly, 23(1), pp. 19-23.

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Abstract

The relationship between length (L) and weight (W) was estimated for 80 species belonging to 50 families of marine fishes from the shelf and upper slope of southern Brazil (lat. 28°S - 34°S). Sample sizes (n) for different species ranged from 11 to 14 741 specimens collected from commercial landings and research surveys. The fit of the equations (W=aLb) with a and b parameters estimated from regular and functional regression (of log-transformed weight and length data) as well as from a non-linear iterative process using the quasi-Newton algorithm were compared. The non-linear method gave the most accurate estimates in terms of residual sum of squares. Differences were less than 2.3% for n>500 compared with predictive regressions and 1.5% compared with functional regressions. No difference was observed between both predictive and functional regressions. Determination coefficients (r2) increased with sample size, and the highest r2 were obtained for 50<n<500, decreasing slightly for larger samples due to seasonal changes in the condition of the fishes.

Item Type: Article
Title: Length-weight relationship of marine fishes from southern Brazil
Personal Creator/Author:
CreatorsEmail
Haimovici, M.
Velasco, G.
Journal or Publication Title: Naga, the ICLARM Quarterly
Volume: 23
Number: 1
Page Range: pp. 19-23
Date: 2000
ISSN: 0116-290X
Issuing Agency: WorldFish Center
Uncontrolled Keywords: Marine fish; Length-weight relationships; Brazil
Subjects: Fisheries
Item ID: 9225
Depositing User: Mr William Ko
Date Deposited: 29 Nov 2012 08:58
Last Modified: 29 Nov 2012 08:58
URI: http://aquaticcommons.org/id/eprint/9225

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