Age and growth of the queen mackerel Scomberomorus plurilineatus from KwaZulu-Natal, South Africa

J. R. Chale-Matsau; A. Govender; L. E. Beckley

doi:10.1016/S0165-7836(99)00060-0

Age and growth of the queen mackerel Scomberomorus plurilineatus from KwaZulu-Natal, South Africa

J. R. Chale-Matsau, A. Govender^*, L. E. Beckley

^*Corresponding author for this work

Marine Science and Fisheries

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

7 Citations (Scopus)

Abstract

The age of the western Indian Ocean pelagic scombrid Scomberomorus plurilineatus was determined by counting rings in whole otoliths. Validation using marginal increment analysis was inconclusive and it was assumed that a single opaque band was laid down annually in the otolith of this species. The maximum observed age was six years. S. plurilineatus is fully recruited to the fishery at the age of one year and 50%-maturity is attained at the age of two years. For the-age-length data, the von Bertalanffy model was found to be the best fitting growth model. Growth was also estimated using a length-based method, Shepherd's Length Composition Analysis, but this proved to be inappropriate because of the seasonality of the catches of S. plurilineatus in KwaZulu-Natal. Based on a catch curve analysis, fishing mortality was estimated to be 0.28 yr^-1. Preliminary per-recruit analyses revealed that spawner biomass of S. plurilineatus is currently reduced to 50% of its unfished level and it appears that the species is optimally exploited.

Original language	English
Pages (from-to)	121-127
Number of pages	7
Journal	Fisheries Research
Volume	44
Issue number	2
DOIs	https://doi.org/10.1016/S0165-7836(99)00060-0
Publication status	Published - Dec 1999

Keywords

Age determination
Growth
Per-recruit modelling
Scomberomorus plurilineatus

ASJC Scopus subject areas

Aquatic Science

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/S0165-7836(99)00060-0

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title = "Age and growth of the queen mackerel Scomberomorus plurilineatus from KwaZulu-Natal, South Africa",

abstract = "The age of the western Indian Ocean pelagic scombrid Scomberomorus plurilineatus was determined by counting rings in whole otoliths. Validation using marginal increment analysis was inconclusive and it was assumed that a single opaque band was laid down annually in the otolith of this species. The maximum observed age was six years. S. plurilineatus is fully recruited to the fishery at the age of one year and 50%-maturity is attained at the age of two years. For the-age-length data, the von Bertalanffy model was found to be the best fitting growth model. Growth was also estimated using a length-based method, Shepherd's Length Composition Analysis, but this proved to be inappropriate because of the seasonality of the catches of S. plurilineatus in KwaZulu-Natal. Based on a catch curve analysis, fishing mortality was estimated to be 0.28 yr-1. Preliminary per-recruit analyses revealed that spawner biomass of S. plurilineatus is currently reduced to 50% of its unfished level and it appears that the species is optimally exploited.",

keywords = "Age determination, Growth, Per-recruit modelling, Scomberomorus plurilineatus",

author = "Chale-Matsau, {J. R.} and A. Govender and Beckley, {L. E.}",

note = "Funding Information: This study was jointly funded by the South African Association for Marine Biological Research, Foundation for Research Development and the Natal Deep Sea Angling Association. We would like to express our sincere thanks and appreciation to the staff of the Oceanographic Research Institute for their assistance in sampling and data collection. We thank two anonymous referees for their comments. ",

year = "1999",

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doi = "10.1016/S0165-7836(99)00060-0",

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journal = "Fisheries Research",

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AU - Chale-Matsau, J. R.

AU - Govender, A.

AU - Beckley, L. E.

N1 - Funding Information: This study was jointly funded by the South African Association for Marine Biological Research, Foundation for Research Development and the Natal Deep Sea Angling Association. We would like to express our sincere thanks and appreciation to the staff of the Oceanographic Research Institute for their assistance in sampling and data collection. We thank two anonymous referees for their comments.

PY - 1999/12

Y1 - 1999/12

N2 - The age of the western Indian Ocean pelagic scombrid Scomberomorus plurilineatus was determined by counting rings in whole otoliths. Validation using marginal increment analysis was inconclusive and it was assumed that a single opaque band was laid down annually in the otolith of this species. The maximum observed age was six years. S. plurilineatus is fully recruited to the fishery at the age of one year and 50%-maturity is attained at the age of two years. For the-age-length data, the von Bertalanffy model was found to be the best fitting growth model. Growth was also estimated using a length-based method, Shepherd's Length Composition Analysis, but this proved to be inappropriate because of the seasonality of the catches of S. plurilineatus in KwaZulu-Natal. Based on a catch curve analysis, fishing mortality was estimated to be 0.28 yr-1. Preliminary per-recruit analyses revealed that spawner biomass of S. plurilineatus is currently reduced to 50% of its unfished level and it appears that the species is optimally exploited.

AB - The age of the western Indian Ocean pelagic scombrid Scomberomorus plurilineatus was determined by counting rings in whole otoliths. Validation using marginal increment analysis was inconclusive and it was assumed that a single opaque band was laid down annually in the otolith of this species. The maximum observed age was six years. S. plurilineatus is fully recruited to the fishery at the age of one year and 50%-maturity is attained at the age of two years. For the-age-length data, the von Bertalanffy model was found to be the best fitting growth model. Growth was also estimated using a length-based method, Shepherd's Length Composition Analysis, but this proved to be inappropriate because of the seasonality of the catches of S. plurilineatus in KwaZulu-Natal. Based on a catch curve analysis, fishing mortality was estimated to be 0.28 yr-1. Preliminary per-recruit analyses revealed that spawner biomass of S. plurilineatus is currently reduced to 50% of its unfished level and it appears that the species is optimally exploited.

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KW - Per-recruit modelling

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Age and growth of the queen mackerel Scomberomorus plurilineatus from KwaZulu-Natal, South Africa

Abstract

Keywords

ASJC Scopus subject areas

UN SDGs

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