Short Note

Invasive Australian crayfish Cherax quadricarinatus in the Sanyati Basin of Lake Kariba: a preliminary survey

  • LT Marufu
  • C Phiri
  • T Nhiwatiwa

Abstract

The invasion of Cherax quadricarinatus, the Australian redclaw crayfish, in the Sanyati Basin of Lake Kariba, Zimbabwe, is reported. A total of 79 crayfish were caught at 10 out of 12 sampling sites in the Sanyati Basin in November–December 2012. The average catch per unit effort (CPUE) varied from 1.1 to 4 crayfish per trap per night, carapace length ranged from 29 to 93.5 mm, and weight ranged from 4 to 196.2 g. Most crayfish were between 50 and 59.9 mm carapace length. Males (average 82.6 g) were significantly heavier than females (37.2 g) and males were larger in carapace length, carapace width, chela length and chela width. A feral population of C. quadricarinatus is now established in the Sanyati Basin. Possible modes of dispersal within the basin are discussed.

Keywords: alien species, dispersal, ecological niche, introduction, sexual dimorphism

African Journal of Aquatic Science 2014, 39(2): 233–236

Author Biographies

LT Marufu
University of Zimbabwe, Department of Biological Sciences, Mount Pleasant, Harare, Zimbabwe
C Phiri
University Lake Kariba Research Station, Kariba, Zimbabwe
T Nhiwatiwa
University of Zimbabwe, Department of Biological Sciences, Mount Pleasant, Harare, Zimbabwe
Published
2014-06-25
Section
Articles

Journal Identifiers


eISSN: 1727-9364
print ISSN: 1608-5914