Title: PWS Herring Program - Non lethal sampling: In situ estimation of juvenile herring sizes
Project Year and Number: 2012: 12120111-D
Other Fiscal Years and Numbers for this Project: None
Principal Investigator (PI): Kevin Boswell
Assisting Personnel: None
Research Location: Prince William Sound
Restoration Category: Research
Injured Resources Addressed: Not Specified
Abstract: A common source of bias in acoustic surveys is proper partitioning of size classes and their respective contribution to biomass estimates (see Simmonds and MacLennan 2005). This is particularly evident when considering the probability of encountering multiple size classes (or age classes) within a given survey region, or even within a large school. Several approaches have been successful in estimating in situ size distributions, though many require appropriate light fields to determine target sizes (Foote and Traynor 1988; Gauthier and Rose 2001; Kloser and Horne 2003). Recent application of imaging sonars have proven useful for acquiring high-resolution measurements of target-length distribution, without the need for ambient or external light sources, thereby reducing the potential of behaviorally mediated bias in length estimation. Further, automated analysis software has been refined to rapidly provide length estimates and target tracking parameters, even for tightly schooling fishes.
*Funding for this project is part of Project 12120111 - PWS Herring and Monitoring Program.
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Publications from this Project: None Available