A new coefficient for evaluation of condition of fish larvae.


Piotr Sarnowski, Barbara Jezierska.


University of Podlasie, Dept. of Animal Physiology, 08110 Siedlce, Prusa 12, Poland, e-mail jezbar@ap.siedlce.pl


Abstract: We propose a new coefficient for evaluation of condition of fish larvae, based on fish body measurements in photographs, as an alternative to Fulton's coefficient. The study was done on young stages of common carp kept under laboratory conditions. The obtained results show that in the first period after hatching, carp larvae grow mostly in length, and adverse environmental factors such as water contamination with copper may reduce their growth. The new coefficient is calculated according to the formula: S=2Pal-2, where Pa body perimeter area, l body length. The values of this new coefficient increase with fish age, and are always higher for the control larvae (0.26-0.43) than for the copper-exposed ones (0.24-0.36). Having body perimeter area, it is also possible to calculate the regression equation for the area/mass relationship, and to estimate the value of Fultons coefficient.


Keywords: Fultons coefficient, fish, condition, growth, copper



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