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Length-weight relationship of marine fishes from southern Brazil

Author

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  • Haimovici, M.
  • Velasco, G.

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

Suggested Citation

  • Haimovici, M. & Velasco, G., 2000. "Length-weight relationship of marine fishes from southern Brazil," Naga, The WorldFish Center, vol. 23(1), pages 19-23.
    • Handle: RePEc:wfi:wfnaga:35806
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    File URL: http://hdl.handle.net/20.500.12348/2426
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    Citations

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    Cited by:

    1. Travers, M. & Shin, Y.-J. & Jennings, S. & Machu, E. & Huggett, J.A. & Field, J.G. & Cury, P.M., 2009. "Two-way coupling versus one-way forcing of plankton and fish models to predict ecosystem changes in the Benguela," Ecological Modelling, Elsevier, vol. 220(21), pages 3089-3099.
    2. Thomas, J. & Venu, S. & Kurup, B.M., 2003. "Length-weight relationship of some deep-sea fish inhabiting the continental slope beyond 250m depth along the west coast of India," Naga, The WorldFish Center, vol. 26(2), pages 17-21.

    More about this item

    Keywords

    Marine fish; Length-weight relationships; Brazil;
    All these keywords.

    JEL classification:

    • Q00 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - General - - - General

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