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Relationship between F ulton's condition factor and proximate body composition in three freshwater fish species

Relationship between F ulton's condition factor and proximate body composition in three... Summary Morphometric‐based condition indices are widely used to assess proximate body composition and, collaterally, feeding and living conditions of fish. However, the exact relationship between condition indices and proximate body composition of fish and its relatedness to life history traits and seasonality has yet to be fully explored. Therefore, the aim of this study was to examine how the Fulton's condition factor (K‐factor) is related to the chemical composition (i.e. lipid, protein, water and carbon content, and molar carbon : nitrogen ratio), length and gonadal development of fish, and how these relationships are influenced by gender and seasonality in three freshwater fish species: Amur sleeper (Perccottus glenii), pumpkinseed (Lepomis gibbosus) and rudd (Scardinius erythrophthalmus). It was found that the strength and direction of association between the K‐factor and proximate body composition can vary markedly among fish species. The K‐factor correlated positively with gonadal development in pumpkinseed and Amur sleeper, while no such relationship existed in rudd. Condition factor can be a reliable measure of lipid content; however, the relationship was stronger in species with higher and more variable lipid contents. Moreover, a striking and consistently negative linkage was found between the K‐factor and water content of the fish body, which corresponds to the findings of several other studies. In turn, any relationship between the K‐factor and the protein content of fish was not detected. Gender seemed to exert a negligible effect on the relationship between the K‐factor and proximate body composition, while seasonal variance was obvious in most relationships. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Applied Ichthyology Wiley

Relationship between F ulton's condition factor and proximate body composition in three freshwater fish species

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References (24)

Publisher
Wiley
Copyright
Copyright © 2015 Blackwell Verlag GmbH
ISSN
0175-8659
eISSN
1439-0426
DOI
10.1111/jai.12658
Publisher site
See Article on Publisher Site

Abstract

Summary Morphometric‐based condition indices are widely used to assess proximate body composition and, collaterally, feeding and living conditions of fish. However, the exact relationship between condition indices and proximate body composition of fish and its relatedness to life history traits and seasonality has yet to be fully explored. Therefore, the aim of this study was to examine how the Fulton's condition factor (K‐factor) is related to the chemical composition (i.e. lipid, protein, water and carbon content, and molar carbon : nitrogen ratio), length and gonadal development of fish, and how these relationships are influenced by gender and seasonality in three freshwater fish species: Amur sleeper (Perccottus glenii), pumpkinseed (Lepomis gibbosus) and rudd (Scardinius erythrophthalmus). It was found that the strength and direction of association between the K‐factor and proximate body composition can vary markedly among fish species. The K‐factor correlated positively with gonadal development in pumpkinseed and Amur sleeper, while no such relationship existed in rudd. Condition factor can be a reliable measure of lipid content; however, the relationship was stronger in species with higher and more variable lipid contents. Moreover, a striking and consistently negative linkage was found between the K‐factor and water content of the fish body, which corresponds to the findings of several other studies. In turn, any relationship between the K‐factor and the protein content of fish was not detected. Gender seemed to exert a negligible effect on the relationship between the K‐factor and proximate body composition, while seasonal variance was obvious in most relationships.

Journal

Journal of Applied Ichthyology – Wiley

Published: Apr 1, 2015

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