Funded
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- Objectives
- Estimate the optimal microturbulence and wind speed for the survival of yellowfin larvae and examine any association between yellowfin recruitment and historical wind speeds in the EPO
- Background
- Studies have shown that feeding success and survival of marine fish larvae can be influenced by the levels of wind-induced microturbulence in the larval feeding environment
- Multiple experiments were conducted over 4 years to examine microturbulence effects on yellowfin larval survival, and optimal turbulence estimates for larval survival were converted to optimal wind speeds
- Estimated optimal wind speeds for larval survival have been examined for correlations with yellowfin recruitment during 1987-2007
- Relevance for management
- The wind speed-recruitment analysis is promising for assessing yellowfin recruitment patterns in relation to larval survival
- Duration
- 24 months
- Workplan and status
- June-December 2019: Refine analyses of survival and feeding data and finalize wind speed-recruitment analysis
- January-December 2021: Complete manuscript and submit to scientific journal
- External collaborators
- University of Tokyo
- Deliverables
- Presentations for SAC-09, SAC-10 and SAC-11
- Publication of results in a scientific journal
- Updated date: 01 Mar 2023
- Progress summary for the reporting period
- Analysis of experimental survival and feeding data in response to microturbulence completed.
- Feeding parameters examined in relation to microturbulence included average prey and biomass consumption and size of prey captured.
- A meeting with Dr. Shingo Kimura at University of Tokyo in August 2019 included adjustments and improvements to the final modeling of the experimental turbulence results.
- During 2022 the experimental analysis of larval feeding responses to microturbulence was expanded
- A manuscript summarizing experimental estimates of optimal microturbulence and a wind speed-recruitment analysis of select areas of the EPO is nearing completion
- Challenges and key lessons learnt
- Measuring microturbulence in experimental tanks is difficult on a scale that is relevant to the foraging environment of larval yellowfin. This was addressed by using a microacoustic doppler velocimeter (ADV) to measure turbulent dissipation rates in the tanks at microscale (5 mm x 5 mm) precision; they were also estimated using a small-scale (m3 ) model developed by a colleague at the University of Tokyo
- Presentation at SAC-10 and SAC-11
Presentation at 45th Larval Fish Conference, August 2022 - Comments
- This project will be completed with the submission of a manuscript by late 2023.