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Validation of age estimates in sparid fishes using fluorochrome marking

journal contribution
posted on 2023-05-16, 20:20 authored by Lang, JB, Colin BuxtonColin Buxton
The marking of sparid otoliths by means of oxytetracycline and alizarin complexone was 'investigated by immersion, feeding and intraperitoneal and intramuscular injections. Of these techniques, immersion for 24 h in a 100-150 mg .1-seawater solution of alizarin complexone was found to be most suitable for marking larval and small juvenile fish. Intramuscular injections of oxytetracycline at a dosage of 250 mg' kg fish-I was the most suitable method for marking the otoliths of juveniles in the laboratory, while dosages between 50 and 100 mg . kg fish-I were used to mark adults in the field. Feeding labelled food to the fish and intraperitoneal injections did not produce a clear mark in the otolith. Auorochrome marks confirmed the daily periodicity of micro-increment formation in some captive sparid species (Diplodus sargus and D. cervinus), and field experiments using Chrysoblephus laticeps showed that this method was a relatively simple way of directly validating age estimates in sparid fish.

History

Publication title

South African Journal of Marine Science

Volume

13

Pagination

195 - 203

ISSN

0257-7615

Department/School

Institute for Marine and Antarctic Studies

Publisher

Sea Fisheries Research Institute

Place of publication

Cape Town, South Africa

Rights statement

Copyright © 1993 National Inquiry Services Centre (NISC)

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the environmental sciences

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