Determining the most suitable method of otolith preparation for estimating the age of tigerfish, Hydrocynus vittatus in the Pongolapoort Dam, South Africa

  • M. Soekoe
  • F.H. van der Bank
  • N.J. Smit
Keywords: age, asterisci, lapilli, otolith, tigerfish.

Abstract

This study compares sectioned and whole lapillus and asterisci otoliths as suitable  structures for ageing tigerfish, Hydrocynus vittatus. Fifty tigerfish were collected from the Pongolapoort Dam, KwaZulu-Natal, South Africa. Growth zone counts on sectioned lapilli showed the greatest percentage agreement (52%) and highest precision (APE = 4.77%, CV = 6.20%). Growth zone counts were symmetrically distributed between  structures (Bowker’s tests P > 0.125). Between-reader analysis also showed sectioned lapilli to have the highest percentage agreement (68%) and best precision (APE = 5.55%, CV = 7.85%).


Key words: age, asterisci, lapilli, otolith, tigerfish.

Published
2017-04-18
Section
Articles

Journal Identifiers


eISSN: 2224-073X
print ISSN: 1562-7020