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Age, growth and maturity of the Australian sharpnose shark Rhizoprionodon taylori from the Gulf of Papua

Coastal sharks with small body sizes may be among the most productive species of chondrichthyans. The Australian sharpnose shark (Rhizoprionodon taylori) is one of the most productive members of this group based on work in northern and eastern Australia. However, life history information throughout...

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Autores principales: Baje, Leontine, Smart, Jonathan J., Chin, Andrew, White, William T., Simpfendorfer, Colin A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6209343/
https://www.ncbi.nlm.nih.gov/pubmed/30379918
http://dx.doi.org/10.1371/journal.pone.0206581
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author Baje, Leontine
Smart, Jonathan J.
Chin, Andrew
White, William T.
Simpfendorfer, Colin A.
author_facet Baje, Leontine
Smart, Jonathan J.
Chin, Andrew
White, William T.
Simpfendorfer, Colin A.
author_sort Baje, Leontine
collection PubMed
description Coastal sharks with small body sizes may be among the most productive species of chondrichthyans. The Australian sharpnose shark (Rhizoprionodon taylori) is one of the most productive members of this group based on work in northern and eastern Australia. However, life history information throughout the remainder of its range is lacking. To address this knowledge gap, the age, growth and maturity of R. taylori caught in the Gulf of Papua prawn trawl fishery in Papua New Guinea, were studied. One hundred and eighty six individuals, comprising 131 females (31–66 cm TL) and 55 males (31–53 cm TL) were aged using vertebral analysis and growth was modelled using a multi-model approach. The lack of small individuals close to the size at birth made fitting of growth curves more difficult, two methods (fixed length at birth and additional zero aged individuals) accounting for this were trialled. The von Bertalanffy growth model provided the best fit to the data when used with a fixed length-at-birth (L(0) = 26 cm TL). Males (L(∞) = 46 cm TL, k = 3.69 yr(-1), L(50) = 41.7 cm TL and A(50) = 0.5 years) grew at a faster rate and matured at smaller sizes and younger ages than females (L(∞) = 58 cm TL, k = 1.98 yr(-1), L(5o) = 47.0 cm TL and A(50) = 0.93 years). However, none of the methods to account for the lack of small individuals fully accounted for this phenomenon, and hence the results remain uncertain. Despite this, the results reaffirm the rapid growth of this species and suggest that the Gulf of Papua population may grow at a faster rate than Australian populations. Rhizoprionodon taylori is possibly well placed to withstand current fishing pressure despite being a common bycatch species in the Gulf of Papua prawn trawl fishery. However, further research needs to be undertaken to estimate other key life history parameters to fully assess the population status of this exploited shark species and its vulnerability to fishing in the Gulf of Papua.
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spelling pubmed-62093432018-11-19 Age, growth and maturity of the Australian sharpnose shark Rhizoprionodon taylori from the Gulf of Papua Baje, Leontine Smart, Jonathan J. Chin, Andrew White, William T. Simpfendorfer, Colin A. PLoS One Research Article Coastal sharks with small body sizes may be among the most productive species of chondrichthyans. The Australian sharpnose shark (Rhizoprionodon taylori) is one of the most productive members of this group based on work in northern and eastern Australia. However, life history information throughout the remainder of its range is lacking. To address this knowledge gap, the age, growth and maturity of R. taylori caught in the Gulf of Papua prawn trawl fishery in Papua New Guinea, were studied. One hundred and eighty six individuals, comprising 131 females (31–66 cm TL) and 55 males (31–53 cm TL) were aged using vertebral analysis and growth was modelled using a multi-model approach. The lack of small individuals close to the size at birth made fitting of growth curves more difficult, two methods (fixed length at birth and additional zero aged individuals) accounting for this were trialled. The von Bertalanffy growth model provided the best fit to the data when used with a fixed length-at-birth (L(0) = 26 cm TL). Males (L(∞) = 46 cm TL, k = 3.69 yr(-1), L(50) = 41.7 cm TL and A(50) = 0.5 years) grew at a faster rate and matured at smaller sizes and younger ages than females (L(∞) = 58 cm TL, k = 1.98 yr(-1), L(5o) = 47.0 cm TL and A(50) = 0.93 years). However, none of the methods to account for the lack of small individuals fully accounted for this phenomenon, and hence the results remain uncertain. Despite this, the results reaffirm the rapid growth of this species and suggest that the Gulf of Papua population may grow at a faster rate than Australian populations. Rhizoprionodon taylori is possibly well placed to withstand current fishing pressure despite being a common bycatch species in the Gulf of Papua prawn trawl fishery. However, further research needs to be undertaken to estimate other key life history parameters to fully assess the population status of this exploited shark species and its vulnerability to fishing in the Gulf of Papua. Public Library of Science 2018-10-31 /pmc/articles/PMC6209343/ /pubmed/30379918 http://dx.doi.org/10.1371/journal.pone.0206581 Text en © 2018 Baje et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Baje, Leontine
Smart, Jonathan J.
Chin, Andrew
White, William T.
Simpfendorfer, Colin A.
Age, growth and maturity of the Australian sharpnose shark Rhizoprionodon taylori from the Gulf of Papua
title Age, growth and maturity of the Australian sharpnose shark Rhizoprionodon taylori from the Gulf of Papua
title_full Age, growth and maturity of the Australian sharpnose shark Rhizoprionodon taylori from the Gulf of Papua
title_fullStr Age, growth and maturity of the Australian sharpnose shark Rhizoprionodon taylori from the Gulf of Papua
title_full_unstemmed Age, growth and maturity of the Australian sharpnose shark Rhizoprionodon taylori from the Gulf of Papua
title_short Age, growth and maturity of the Australian sharpnose shark Rhizoprionodon taylori from the Gulf of Papua
title_sort age, growth and maturity of the australian sharpnose shark rhizoprionodon taylori from the gulf of papua
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6209343/
https://www.ncbi.nlm.nih.gov/pubmed/30379918
http://dx.doi.org/10.1371/journal.pone.0206581
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