Functions for constructing and validating standard weight (Ws) equations for fish.
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This is the github page for the FSAWs package for R developed by Derek Ogle at Northland College. This package contains functions for constructing and validating standard weight (Ws) equations for fish that were originally in the FSA package.


This package can be installed from github to your R with the following code

if (!require('devtools')) install.packages('devtools'); require('devtools')

Descriptions of recent changes can be found in the file


Contact me with questions by sending a friendly e-mail to


The functions in this package, when they were part of the FSA package, have been used in the following publications:

  • Ogle DH, Winfield IJ. 2009. Ruffe length-weight relationships with a proposed standard weight equation. North American Journal of Fisheries Management 29:850-85.
  • Giannetto D, Carosi A, Franchi E, La Porta G, Lorenzoni M. 2012. Proposed standard weight (Ws) equation for European perch (Perca fluviatilis Linnaeus, 1758). Journal of Applied Ichthyology 28:34-39.
  • Giannetto D, Franchi E, Pompei L, Lorenzoni M, Porcellotti S, Tancioni L. 2012. Proposed empirical standard weight equation for brook chub Squalius lucumonis. North American Journal of Fisheries Management 32:428-435.
  • Giannetto D, Giuseppi M, Pompei L, Stefano P., Lorenzoni M. 2015. Length-length, length-weight and a proposed standard weight equation for the Italian endemic species Barbus tyberinus Bonaparte, 1839. Turkish Journal of Zoology 15:191-196.
  • Giannetto D, La Porta G, Maio G, Pizzul E, Turin P, Lorenzoni M. 2011. Proposed standard mass equations for European chub Leuciscus cephalus in Italy. Journal of Fish Biology 78:1890-1899.
  • Giannetto D, Maio G, Pompei L, Porcellotti S, Lorenzoni M. 2016. Length-weight, length-length and a proposed empirical standard weight equations for the Italian endemic cyprinid species Sarmarutilus rubilio. Cybium 40:115-119.
  • Giannetto D, PeDiCillo G. 2011. Proposed standard weight (Ws) equations for Telestes muticellus (Bonaparte, 1837) in the Tiber River basin. Cybium 35:141-147.
  • Giannetto D, Pompei L, Lorenzoni M, Tarkan AS. 2012. Empirical standard weight equation for the Aegean Chub Squalius fellowesii, an endemic freshwater fish species of Western Anatolia, Turkey. North American Journal of Fisheries Management 32:1102-1107.
  • Giannetto D, Tarkan AS, Akbaş F, Top N, Ağdamar S, Karakuş U, Pompei L, Lorenzoni M. 2015. Length-weight and length-length relationships for three endemic cyprinid species of Aegean region (Turkey) with proposed standard weight equations. Turkish Journal of Zoology 39:925-932.
  • Lorenzoni M, Giannetto D, Maio G, Pizzul E, Pompei L, Turin P, Vincenzi S, Crivelli A. 2012. Empirical standard mass equation for Salmo marmoratus. Journal of Fish Biology 81:2086-2091.
  • Sulun S, Baskurt S, Emiroglu O, Giannetto D, Tarkan AS, Agdamar S, Gaygusuz O, Dorak Z, Aydin H, Dicek A. 2014. Development of empirical standard weight equation for Pursak chub Squalius pursakensis, an endemic cyprinid of Northwest Anatolia. Turkish Journal of Zoology.