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2020 Discard Estimation, Precision, and Sample Size Analyses for 14 Federally Managed Species Groups in the Waters off the Northeastern United States
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2020
[PDF-4.76 MB]
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Description:This report describes the analyses associated with the discard estimation of 14 federally managed fish and invertebrate species groups during the July 2018 through June 2019 time period and the expected coverage needed by at-sea observers for northeastern United States fisheries for the April 2019 through March 2020 time period by using the Standardized Bycatch Reporting Methodology. An estimated 61,880 mt (136,420,948 lb) of federally regulated species were discarded during the July 2018 through June 2019 time period. The predominant species groups discarded were skates (Rajidae) and sea scallop (Placopecten magellanicus). Across all species groups examined, “no market” was the reason reported for the majority of discards. Analyses also revealed that for fleets with observer coverage, the coverage within a fleet corresponded with the spatial and temporal patterns of fishing activity in terms of kept weight of all species. The discards reported in this document may not necessarily correspond directly with the discard estimates derived for individual stock assessments because of differences in stratification and data. Hence, the discard estimates are not definitive, but indicative of where discarding occurred among commercial fleets and for which species groups. An estimated 6,404 sea days are needed to achieve a precision-based performance standard (30% coefficient of variation of the discard estimate) for the 14 fish and invertebrate species groups across 62 fleets. The sea day analyses used a standardized protocol to account for the importance of the discarded species relative to the amount of discards by each fleet and total fishing mortality.
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