Age and growth of Rhabdosargus sarba (Pisces: Sparidae), from KwaZulu-Natal, South Africa

P. V. Radebe; B. Q. Mann; L. E. Beckley; A. Govender

doi:10.1016/S0165-7836(01)00383-6

Age and growth of Rhabdosargus sarba (Pisces: Sparidae), from KwaZulu-Natal, South Africa

P. V. Radebe, B. Q. Mann^*, L. E. Beckley, A. Govender

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

27 Citations (Scopus)

Abstract

Age and growth of Rhabdosargus sarba, sampled along the KwaZulu-Natal coast was estimated by counting the number of growth rings in sectioned sagittal otoliths read under transmitted light. The reproducibility of otolith readings was described by the average percentage error index, which was equal to 4.7%. Validation of the annual periodicity of growth zone deposition was achieved through marginal zone analysis and oxytetracycline labeling of captive fish. The age-length data from the sample of 216 fish was best described by the special Von Bertalanffy growth function of the form: L_t = 715 mmFL (1 - e^{-0.16/year(t+0.996 years)}) Like most sparids, R. sarba is a slow growing, long-lived species. The study revealed a maximum age of 16+ years and, based on previously published data, the age-at-maturity was estimated to be 1.8 years.

Original language	English
Pages (from-to)	193-201
Number of pages	9
Journal	Fisheries Research
Volume	58
Issue number	2
DOIs	https://doi.org/10.1016/S0165-7836(01)00383-6
Publication status	Published - Nov 2002
Externally published	Yes

Keywords

Age and growth
Rhabdosargus sarba
South Africa
Sparidae

ASJC Scopus subject areas

Aquatic Science

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10.1016/S0165-7836(01)00383-6

Cite this

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title = "Age and growth of Rhabdosargus sarba (Pisces: Sparidae), from KwaZulu-Natal, South Africa",

abstract = "Age and growth of Rhabdosargus sarba, sampled along the KwaZulu-Natal coast was estimated by counting the number of growth rings in sectioned sagittal otoliths read under transmitted light. The reproducibility of otolith readings was described by the average percentage error index, which was equal to 4.7%. Validation of the annual periodicity of growth zone deposition was achieved through marginal zone analysis and oxytetracycline labeling of captive fish. The age-length data from the sample of 216 fish was best described by the special Von Bertalanffy growth function of the form: Lt = 715 mmFL (1 - e-0.16/year(t+0.996 years)) Like most sparids, R. sarba is a slow growing, long-lived species. The study revealed a maximum age of 16+ years and, based on previously published data, the age-at-maturity was estimated to be 1.8 years.",

keywords = "Age and growth, Rhabdosargus sarba, South Africa, Sparidae",

author = "Radebe, {P. V.} and Mann, {B. Q.} and Beckley, {L. E.} and A. Govender",

note = "Funding Information: Anglers from the Natal Coastal Anglers Union are thanked for making their catches available for otolith removal at fishing competitions. Staff from the KwaZulu-Natal Nature Conservation Service are thanked for providing confiscated specimens. The assistance of Alke Kruger and Sean Fennessy in otolith preparation, reading and analysis is gratefully appreciated. This study was funded by the South African Association for Marine Biological Research (SAAMBR), National Research Foundation (NRF) and the University of Natal Research Fund (UNRF). South African Women in Science and Engineering (SAWISE) is gratefully acknowledged for a scholarship to the senior author.",

year = "2002",

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doi = "10.1016/S0165-7836(01)00383-6",

language = "English",

volume = "58",

pages = "193--201",

journal = "Fisheries Research",

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AU - Radebe, P. V.

AU - Mann, B. Q.

AU - Beckley, L. E.

AU - Govender, A.

N1 - Funding Information: Anglers from the Natal Coastal Anglers Union are thanked for making their catches available for otolith removal at fishing competitions. Staff from the KwaZulu-Natal Nature Conservation Service are thanked for providing confiscated specimens. The assistance of Alke Kruger and Sean Fennessy in otolith preparation, reading and analysis is gratefully appreciated. This study was funded by the South African Association for Marine Biological Research (SAAMBR), National Research Foundation (NRF) and the University of Natal Research Fund (UNRF). South African Women in Science and Engineering (SAWISE) is gratefully acknowledged for a scholarship to the senior author.

PY - 2002/11

Y1 - 2002/11

N2 - Age and growth of Rhabdosargus sarba, sampled along the KwaZulu-Natal coast was estimated by counting the number of growth rings in sectioned sagittal otoliths read under transmitted light. The reproducibility of otolith readings was described by the average percentage error index, which was equal to 4.7%. Validation of the annual periodicity of growth zone deposition was achieved through marginal zone analysis and oxytetracycline labeling of captive fish. The age-length data from the sample of 216 fish was best described by the special Von Bertalanffy growth function of the form: Lt = 715 mmFL (1 - e-0.16/year(t+0.996 years)) Like most sparids, R. sarba is a slow growing, long-lived species. The study revealed a maximum age of 16+ years and, based on previously published data, the age-at-maturity was estimated to be 1.8 years.

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Age and growth of Rhabdosargus sarba (Pisces: Sparidae), from KwaZulu-Natal, South Africa

Abstract

Keywords

ASJC Scopus subject areas

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