Values correspond to Ryther Index values
Ecosystem Overfishing Time Series
Between 2016 and 2021, average annual Ryther Index values from the Northeast were substantially lower than historical patterns, although there is no trend in values.
Indicator Source Information:
Landings are reported in tons of round (live) weight for all species or groups except univalve and bivalve mollusks, such as clams, mussels, oysters and scallops, which are reported as weight of meats (excludes shell weight). Landings data may sometimes differ from state-reported landings due to our reporting of mollusks in meat weights rather than gallons, shell weight, or bushels. Also, NMFS includes some species such as kelp and oysters that are sometimes reported by state agricultural agencies and may not be included with state fishery agency landings data.
Data Background and Caveats:
All landings summaries used in the compilation of this indicator only include non-confidential data. Federal statutes prohibit public disclosure of landings (or other information) that would allow identification of the data contributors and possibly put them at a competitive disadvantage. Most summarized landings here are non-confidential, but whenever confidential landings occur they have been combined with other landings and usually reported as "Withheld for Confidentiality" Total landings by state include confidential data and will be accurate, but landings reported by individual species may, in some instances, be misleading due to data confidentiality, which would be minimal given the aggregated nature of how these data were combined.
Landings data do not indicate the physical location of harvest but the location at which the landings either first crossed the dock or were reported from, as associated with major regions in the US
Many fishery products are gutted or otherwise processed while at sea and are landed in a product type other than round (whole) weight. Our data partners have standard conversion factors for the majority of the commonly caught species that convert their landing weights from any product type to whole weight. It is the whole weight that is displayed in our web site landing statistics. Caution should be exercised when using these statistics. An example of a potential problem is when landings statistics are used to monitor fishery quotas. In some situations, specific conversion factors may have been designated in fishery management plans or Federal rule making that differ from those historically used by NOAA Fisheries in reporting landings statistics.
Landings do not include aquaculture products except for clams, mussels and oysters.
Pacific landings summarized by state include an artificial “state” designation of “At-Sea Process, Pac.” This designation was assigned to landings consisting of primarily whiting caught in the EEZ off Washington and Oregon that were processed aboard large vessels while at sea. No Pacific state lists these fish on their trip tickets which are used to report state fishery landing, hence the at-sea processor designation was used to insure that they would be listed as a U.S. landing.
Landing summaries are compiled from data bases that overlap in time and geographic coverage, and come from both within and outside of NOAA Fisheries.
Ecosystem overfishing metrics also have potential thresholds, usually for the Ryther Index of approximately 1; but we do not report Ryther index values here relative to any threshold. Rather, we report the value of the indices for each region relative to their time series values. Comparison to some regional reports may slightly differ due to the inclusion or exclusion of specific species, but the same general trends are observed and align.