Short Notes

Predation on invasive redclaw crayfish Cherax quadricarinatus by native fishes in the Kafue River, Zambia

Published in: African Journal of Aquatic Science
Volume 39, issue 4, 2014, pages: 473–477
DOI: 10.2989/16085914.2014.980774
Author(s): AB. TyserSchool of Biosciences, UK, RJ. DouthwaiteKafue River Trust, UK

Abstract

The stomach contents of eight species of predatory or omnivorous fish caught in gillnets in the Kafue River in May and June 2010 were examined to determine the relative importance, expressed as ‘prominence value’ (PV), of crayfish Cherax quadricarinatus in their diet. Four species, Clarias gariepinus, Schilbe intermedius, Serranochromis robustus and Serranochromis angusticeps, had fed on C. quadricarinatus. The PV of C. quadricarinatus was highest in C. gariepinus, in which the quantity and size of crayfish eaten was significantly correlated with standard length (SL) of fish >200 mm SL. Predated C. quadricarinatus were significantly smaller (mean carapace length [CL] 30 mm; SE 1.2) than those caught in gillnets (mean CL 76 mm; SE 0.9). No C. quadricarinatus remains were found in the stomachs of Oreochromis andersonii, Synodontis macrostigma, Serranochromis macrocephalus or Mormyrus lacerda.

Get new issue alerts for African Journal of Aquatic Science