Project number: 1985-076
Project Status:
Completed
Budget expenditure: $0.00
Principal Investigator: John Thorogood
Organisation: John Thorogood
Project start/end date: 27 Jun 1986 - 29 Jun 1986
Contact:
FRDC
TAGS
Biology
Ageing

Objectives

1. Collect otoliths from SBT &gt
130 cm. Determine time & periodicity of otolith band formation, hence seasonal & yearly growth rates. Validate otolith age determination methods developed from juvenile SBT for mature SBT. Age determination method independent of

Final report

Author: John Thorogood
Final Report • 2011-08-01 • 2.78 MB
1985-076-DLD.pdf

Summary

Otoliths of Southern Bluefin Tuna (Thunnus maccoyii) taken from waters off New South Wales, South Australia, and Western Australia, of between 42 cm and 167 cm F.L. were prepared to reveal annual banding.

Methods of preparation and examination are detailed.

Otolith growth was demonstrated to be directly proportional to fish growth for the size range studied.

Sampling over 13 months provided validation of the annual nature of bands for fish in their 3rd, 4th and 5th year of growth. Band formation of fish in their 2nd, 6th, 7th, 8th and 9th years of growth also appeared to be annular, though samples were available from an insufficient number of months for confident validation.

Von Bertalanffy growth parameters were derived from determined age-at-length data.

Related research

All research
research
Environment
Environment
Environment
PROJECT NUMBER • 2022-032
PROJECT STATUS:
CURRENT

Biological parameters for stock assessments in South Eastern Australia – an information and capacity uplift

1. Develop, in collaboration and consultation with key research and fishery stakeholders a series of projects involving postgraduate students and early-mid career researchers that directly address priority areas for updating biological parameters for target species in the SESSF and understanding the...
ORGANISATION:
CSIRO Oceans and Atmosphere Hobart