Validated age and growth of the dusky shark, Carcharhinus obscurus, from Western Australian waters
Age and growth of Carcharhinus obscurus was studied by vertebral ageing techniques. The annual formation of growth bands in the vertebrae was validated with oxytetracycline-injected individuals at liberty up to 1481 days. Growth-band counts of vertebral samples from 305 individuals ranging in size f...
Published in: | Marine and Freshwater Research |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
CSIRO
2002
|
Subjects: | |
Online Access: | https://researchonline.jcu.edu.au/3457/1/3457_Simpfendorfer_and_McAuley_2002_.pdf |
id |
ftjamescook:oai:researchonline.jcu.edu.au:3457 |
---|---|
record_format |
openpolar |
spelling |
ftjamescook:oai:researchonline.jcu.edu.au:3457 2024-02-11T10:06:27+01:00 Validated age and growth of the dusky shark, Carcharhinus obscurus, from Western Australian waters Simpfendorfer, Colin A. McAuley, Rory B. Chidlow, Justin Unsworth, Phil 2002 application/pdf https://researchonline.jcu.edu.au/3457/1/3457_Simpfendorfer_and_McAuley_2002_.pdf unknown CSIRO http://dx.doi.org/10.1071/MF01131 https://researchonline.jcu.edu.au/3457/ https://researchonline.jcu.edu.au/3457/1/3457_Simpfendorfer_and_McAuley_2002_.pdf Simpfendorfer, Colin A., McAuley, Rory B., Chidlow, Justin, and Unsworth, Phil (2002) Validated age and growth of the dusky shark, Carcharhinus obscurus, from Western Australian waters. Marine and Freshwater Research, 53 (2). pp. 567-573. restricted Article PeerReviewed 2002 ftjamescook https://doi.org/10.1071/MF01131 2024-01-22T23:21:48Z Age and growth of Carcharhinus obscurus was studied by vertebral ageing techniques. The annual formation of growth bands in the vertebrae was validated with oxytetracycline-injected individuals at liberty up to 1481 days. Growth-band counts of vertebral samples from 305 individuals ranging in size from 63 to 282 cm fork length were used to construct growth curves. Assuming a mean size at birth of 75.3 cm, estimates of von Bertalanffy growth parameters for males were: L∞ = 336.5 cm and K = 0.045 year–1. Growth parameters for females were: L∞= 354.4 cm and K = 0.043 year–1. The age at maturity was estimated to be 17–22 years for females (220–250 cm), and 20 – 23 years for males (230–243 cm). The oldest animal aged was a 32-year-old female 274 cm in length. Growth-rate estimates based on vertebral ageing for animals up to 5 years of age are similar to those from tag–recapture studies on the same population. The results of the present study were similar to those for C. obscurus from the south-western Indian Ocean and the western North Atlantic Ocean, indicating that age and growth are similar among these populations. Article in Journal/Newspaper North Atlantic James Cook University, Australia: ResearchOnline@JCU Indian Marine and Freshwater Research 53 2 567 |
institution |
Open Polar |
collection |
James Cook University, Australia: ResearchOnline@JCU |
op_collection_id |
ftjamescook |
language |
unknown |
description |
Age and growth of Carcharhinus obscurus was studied by vertebral ageing techniques. The annual formation of growth bands in the vertebrae was validated with oxytetracycline-injected individuals at liberty up to 1481 days. Growth-band counts of vertebral samples from 305 individuals ranging in size from 63 to 282 cm fork length were used to construct growth curves. Assuming a mean size at birth of 75.3 cm, estimates of von Bertalanffy growth parameters for males were: L∞ = 336.5 cm and K = 0.045 year–1. Growth parameters for females were: L∞= 354.4 cm and K = 0.043 year–1. The age at maturity was estimated to be 17–22 years for females (220–250 cm), and 20 – 23 years for males (230–243 cm). The oldest animal aged was a 32-year-old female 274 cm in length. Growth-rate estimates based on vertebral ageing for animals up to 5 years of age are similar to those from tag–recapture studies on the same population. The results of the present study were similar to those for C. obscurus from the south-western Indian Ocean and the western North Atlantic Ocean, indicating that age and growth are similar among these populations. |
format |
Article in Journal/Newspaper |
author |
Simpfendorfer, Colin A. McAuley, Rory B. Chidlow, Justin Unsworth, Phil |
spellingShingle |
Simpfendorfer, Colin A. McAuley, Rory B. Chidlow, Justin Unsworth, Phil Validated age and growth of the dusky shark, Carcharhinus obscurus, from Western Australian waters |
author_facet |
Simpfendorfer, Colin A. McAuley, Rory B. Chidlow, Justin Unsworth, Phil |
author_sort |
Simpfendorfer, Colin A. |
title |
Validated age and growth of the dusky shark, Carcharhinus obscurus, from Western Australian waters |
title_short |
Validated age and growth of the dusky shark, Carcharhinus obscurus, from Western Australian waters |
title_full |
Validated age and growth of the dusky shark, Carcharhinus obscurus, from Western Australian waters |
title_fullStr |
Validated age and growth of the dusky shark, Carcharhinus obscurus, from Western Australian waters |
title_full_unstemmed |
Validated age and growth of the dusky shark, Carcharhinus obscurus, from Western Australian waters |
title_sort |
validated age and growth of the dusky shark, carcharhinus obscurus, from western australian waters |
publisher |
CSIRO |
publishDate |
2002 |
url |
https://researchonline.jcu.edu.au/3457/1/3457_Simpfendorfer_and_McAuley_2002_.pdf |
geographic |
Indian |
geographic_facet |
Indian |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
http://dx.doi.org/10.1071/MF01131 https://researchonline.jcu.edu.au/3457/ https://researchonline.jcu.edu.au/3457/1/3457_Simpfendorfer_and_McAuley_2002_.pdf Simpfendorfer, Colin A., McAuley, Rory B., Chidlow, Justin, and Unsworth, Phil (2002) Validated age and growth of the dusky shark, Carcharhinus obscurus, from Western Australian waters. Marine and Freshwater Research, 53 (2). pp. 567-573. |
op_rights |
restricted |
op_doi |
https://doi.org/10.1071/MF01131 |
container_title |
Marine and Freshwater Research |
container_volume |
53 |
container_issue |
2 |
container_start_page |
567 |
_version_ |
1790604190730420224 |