Translator Disclaimer
1 October 2016 Validation of the Periodicity of Growth Zone Formation in the Otoliths of Four Fish Species from the Upper Zambezi Ecoregion, Southern Africa
Author Affiliations +
Abstract

In the Upper Zambezi and Okavango ecoregions, Brycinus lateralis, Hepsetus cuvieri, Schilbe intermedius and Serranochromis macrocephalus are important in subsistence fisheries, while S. intermedius and S. macrocephalus are often caught in commercial catches. Despite their importance, there is little information on their age and growth and age validation. Growth zone deposition rate in otoliths of B. lateralis, H. cuvieri, S. intermedius and S. macrocephalus was validated as annual using edge analysis in this study. Annual deposition of growth zones was corroborated by a fluorochrome marking experiment. Both methods demonstrated that one growth zone was deposited annually. Edge analysis demonstrated that the highest proportion of opaque zones was detected between August and December, most likely as a result of slow growth during lower temperature water during the preceding winter. With growth zone deposition validated as annual, future research should focus on determining the growth, maturity and mortality rates of these species, parameters which are important for their management.

© Zoological Society of Southern Africa
Geraldine C Taylor, Richard A Peel, Clinton J Hay, and Olaf LF Weyl "Validation of the Periodicity of Growth Zone Formation in the Otoliths of Four Fish Species from the Upper Zambezi Ecoregion, Southern Africa," African Zoology 51(3), (1 October 2016). https://doi.org/10.1080/15627020.2016.1233829
Received: 9 March 2016; Accepted: 1 September 2016; Published: 1 October 2016
JOURNAL ARTICLE
7 PAGES


SHARE
ARTICLE IMPACT
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top