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Table 2
Susceptibility attributes and scoring thresholds used in the example PSA of the eastern Pacific Ocean purse-seine fishery (Duffy et al., 2019). Attribute definitions taken from Table 2 in Patrick et al. (2010) with the exception of areal overlap taken from Griffiths et al. (2018).
| Susceptibility attribute | Definition | Ranking | ||
|---|---|---|---|---|
| Low (1) | Moderate (2) | High (3) | ||
| Management strategy | The susceptibility of a stock to overfishing may largely depend on the effectiveness of fishery management procedures used to control catch. | Management and proactive accountability measures in place | Stocks specifically named in conservation resolutions; closely monitored | No management measures; stocks closely monitored |
| Areal overlap | The horizontal overlap of a species' geographic distribution and the distribution of effort for each purse-seine fishery calculated as: Gk /G; where G is the total number of grid cells occupied by a species, and Gk is the number of grid cells containing at least one unit of fishing effort by fishery k during 2005–2013. | Proportion of species-occupied grids (Gk/G) fished <0.33 | Proportion of species-occupied grids (Gk/G) fished between 0.33 and 0.67 | Proportion of species-occupied grids (Gk/G) fished ≥0.67 |
| Vertical overlap with gear | The position of the stock within the water column (i.e., whether is demersal or pelagic) in relation to the fishing gear. | <25% of stock occurs at the depths fished | Between 25% and 50% of the stock occurs at the depths fished | >50% of the stock occurs in the depths fished |
| Seasonal migrations | Seasonal migrations (i.e. spawning or feeding migrations) either to or from the fishery area could affect the overlap between the stock and the fishery. | Seasonal migrations decrease overlap with the fishery | Seasonal migrations do not substantially affect the overlap with the fishery | Seasonal migrations increase overlap with the fishery |
| Schooling/Aggregation and other behavioural responses to gear | Behavioural responses of both individual fish and the stock in response to fishing. | Behavioural responses decrease catchability of the gear | Behavioural responses do not substantially affect the catchability of the gear | Behavioural responses increase the catchability of the gear |
| Post-release survival under current fishing practices | Fish survival after capture and release varies by species, region, and gear type or even market conditions, and thus can affect the susceptibility of the stock. | Probability of survival >67% | 33% < probability of survival ≤67% | Probability of survival <33% |
| Desirability/value of catch (percent retention) | The assumption that highly valued fish stocks are more susceptible to overfishing or to becoming overfished by recreational or commercial fishermen owing to increased effort. | Stock is not highly valued or desired by the fishery (<33% retention) | Stock is moderately valued or desired by the fishery (33–66% retention) | Stock is highly valued or desired by the fishery (>66% retention) |
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