How we estimate discarded fish based on fishery observer information.
In 2010, we developed a new methodology to estimate discards based on observer information. During November 2016, the Greater Atlantic Regional Fisheries Office hosted a review the methodology to consider modifications based on concerns raised by fishermen, stakeholders, and our staff.
- Terms of Reference
- Working Papers
- Methods for examining in-season behavior of the cumulative discard estimation in the Greater Atlantic Region
- Cumulative discard methodology review for catch cap monitoring in the Atlantic sea scallop (Placopecten magellanicus)
- Cumulative discard methodology review for butterfish (Peprilus triacanthus) discards in the longfin squid (Doryteuthis (Amerigo) pealeii) fishery
- Cumulative discard methodology review for catch cap monitoring in the Atlantic herring (Clupea harengus) and Atlantic mackerel (Scomber scombrus) fisheries
- Cumulative discard methodology review for groundfish discards in the Northeast United States groundfish fishery
The Center for Independent Experts (CIE) obtained the services of two scientists who conducted the independent peer review:
- Robin Cook, Ph.D., University of Strathclyde, Glasgow, Scotland
- Shijie Zhou, Ph.D., CSIRO Oceans & Atmosphere, Australia
Peer Review Reports and GARFO Responses
- Robin Cook Review Report
- Shijie Zhou Review Report
- GARFO Summary and Response
- R package (discaRd) for calculating discard estimates
Discard Methodology for Audit Model Electronic Monitoring
Since 2016, a subset of vessels in the Northeast Multispecies fishery has been outfitted with electronic monitoring (EM) systems to collect data on discarded groundfish, including observations that are self-reported (VTRs) and those resulting from review of recorded video footage. This EM program developed an audit-based approach that reviews video from a random selection of trips to leverage the relationship between EM-reviewed discards and VTR-reported discards and optimize review rates.
In 2021, we submitted a white paper documenting the effort to the Center for Independent Experts (CIE) for review. The CIE obtained the services of 3 scientists who conducted an independent peer review:
- Yan Jiao, Ph.D., Virginia Tech University, Blacksburg, VA
- Coby Needle, Ph.D., Marine Scotland, Aberdeen, UK
- Joseph Powers, Ph.D., Joseph Powers Consulting, Grenada, West Indies