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Social-Ecological Systems Meta-Analysis Database: Component

SummaryStocks of Atlantic Bluefin Tuna that spawn in the western Atlantic ocean
SubtypeNatural Resource Unit
SectorFisheries (Stock-specific)
Commons AggregationPopulation
ExplanationWestern Bluefin tuna are a subpopulation of the species Thunnus thynnus that spawns in the Western Atlantic Ocean (i.e. the Americas)
Commons BoundariesVery unclear boundaries (1)
ExplanationAlthough the Western Atlantic Bluefin Tuna spawns in the Western Atlantic, they mix with the Eastern stock on feeding grounds. The extent of mixing is generally unknown.
Commons Unit SizeMedium (3)
ExplanationAdult bluefin tuna weigh up to 900 kg, although the average adult weighs in at around 250kg and is 2.5m in length.
Environmental MediumOceanic
Inter Annual PredictabilityModerate (2)
ExplanationThe availability of Western Atlantic Bluefin Tuna can be predicted using scientific methodologies such as virtual population analysis. However, these figures are highly contested, and several uncertainties remain. Nonetheless, relative magnitudes can be assessed given a consistent methodology.
Intra Annual PredictabilityHigh (3)
ExplanationThere is little seasonal variation in resource availability.
Commons RenewabilityRenewable (1)
ProductivityModerately Productive (2)
ExplanationThe Western Atlantic Bluefin Tuna is moderately productive meaning it can sustain a commercial fishery, but at levels far below Eastern Stock. The sustainability of a commercial fishery is contested by some who argue that the stock ought to be listed on CITES.
Commons AccessibilityVery accessible (3)
ExplanationAlthough Western Atlantic Bluefin Tuna are located throughout the Western Atlantic Ocean, they are easily accessible for modern oceanic fishing fleets that target them.
Commons HeterogeneityHigh (3)
ExplanationAdult Western Atlantic Bluefin tuna congregate in the Gulf of Mexico during the spawning season. However, for the rest of the year they are distributed widely throughout the Western Atlantic.
Commons MobilityHigh (3)
ExplanationWestern Atlantic Bluefin Tuna travel throughout the Western Atlantic Ocean, and migrate across into the Eastern Atlantic. They can reach speeds of up to 60 km/h.
Commons Spatial Extent106000000
ExplanationThis is the approximate size of the Atlantic Ocean and Mediterranean Sea. Although they are more concentrated in the Western Atlantic, they may occur throughout much of this range in small numbers.
Technical SubstituteNo