Assessing the operational feasibility of stereo-video and evaluating monitoring options for the Southern Bluefin Tuna Fishery ranch sector
Other formats
This information is also available in the following formats:
PDF [2.9mb]
Word [3.3mb]This report provides results from field trials designed to test the accuracy, precision and robustness of stereo-video cameras under at-sea research transfer conditions in Australia’s southern bluefin tuna (SBT) ranching sector.
Objectives:
- Assess the accuracy and precision of stereo-video length measurements obtained under operational conditions
- Develop statistically robust sample sizes and sampling regimes that will collect a subset of stereo-video length measurements representative of the length distribution in a transfer
- Assess the robustness and suitability of the stereo-video equipment in operational conditions
- Develop options for converting stereo-video length measurements into weight estimates
Outcomes achieved to date
Outcomes of this project are an assessment of the accuracy and precision of length measurements of southern bluefin tuna (SBT) obtained from a commercially leased stereo-video camera during transfer between ranch pontoons; an assessment of the physical robustness of the stereo-video camera unit; four sampling regimes that may be applied by management to stereo-video length measurements of SBT obtained during transfer; and a list of options for converting stereo-video length measurements of SBT to weight estimates for catch acquittal purposes.
- Publication details
- Non technical summary
Outcomes achieved to date
- Acknowledgements
- Background
- Needs
- Objectives
- Materials and methods
Capture and tagging of SBT
Stereo-video camera
Calibration of stereo-video
Length measurement
Statistical analysis
Modelling stereo-video length measurements of tailstropped SBT
Multiple frames of individual SBT: which measurement is best?
- Results
Transfers
Physical robustness in operational conditions
Direct length measurements
Stereo-video measurements
Sampling regimes
Options for converting stereo-video lengths to weights
- Benefits
- Further development
1) Assessment under conditions of turbidity
2) Testing of sampling regime: do assumptions hold when n is increased?
- Planned outcomes
- Conclusion
Objective 1. Assess the accuracy and precision of stereo-video length measurements obtained under operational conditions
Objective 2. Develop statistically robust sample sizes and sampling regimes for stereo-video measurement
Objective 3. Assess the robustness and suitability of the stereo-video length equipment in operational conditions
Objective 4. Develop options for the conversion of stereo-video length measurements to weight estimates
- References
- Appendixes