eCite Digital Repository

The growth of Oreochromis andersoni (Pisces:Chichlidae) from the Okavango Delta, Botswana, and a comparison of the scale and otolith methods of ageing

Citation

Booth, A and Merron, GA and Buxton, CD, The growth of Oreochromis andersoni (Pisces:Chichlidae) from the Okavango Delta, Botswana, and a comparison of the scale and otolith methods of ageing, Environmental Biology of Fishes, 43 pp. 171 - 178. ISSN 0378-1909 (1995) [Refereed Article]


Preview
PDF
Restricted - Request a copy
675Kb
  

Copyright Statement

The original publication is available at www.springerlink.com

Official URL: http://www.springerlink.com

DOI: doi:10.1007/BF00002488

Abstract

Otoliths and scales were used for age and growth determination ofOreochromis andersonii from the Okavango Delta, Botswana. Marginal increment analysis showed that an annulus was formed in both the scales and otoliths during the dry summer period. Using scales, the growth ofO. andersonii was described by Lt = 285.27(1-e-0.26(t+2.02)) mm SL and using otoliths by the equation Lt = 267.48(1-e-0.25(t+2.18)) mm SL. Maximum age estimates of 10 years using scales and 13 years using otoliths were obtained and the growth curves were significantly different (p < 0.01). Age estimation using scales tended to over-emphasise growth inO. andersonii resulting in larger predicted lengths-at-age. For this reason, otoliths are considered to be more reliable and suitable than scales in determining the age and growth of this species.

Item Details

Item Type:Refereed Article
Keywords:Seasonality - Floodplain ecology - Ring formation - von Bertalanffy model
Research Division:Agricultural and Veterinary Sciences
Research Group:Fisheries Sciences
Research Field:Fisheries Sciences not elsewhere classified
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Environmental Sciences
Author:Buxton, CD (Professor Colin Buxton)
ID Code:48463
Year Published:1995
Web of Science® Times Cited:35
Deposited By:TAFI - Marine Research Laboratory
Deposited On:2007-08-01
Last Modified:2009-11-13
Downloads:4 View Download Statistics

Repository Staff Only: item control page