Lessons learnt on the management of short-lived fish from the Bay of Biscay anchovy case study: Satisfying fishery needs and sustainability under recruitment uncertainty

Uriarte, Andrés; Ibaibarriaga, Leire; Sánchez-Maroño, Sonia; Abaunza, Pablo; Andrés, Marga; Duhamel, Erwan; Jardim, Ernesto; Pawlowski, Lionel; Prellezo, Raúl; Roel, Beatriz

doi:10.1016/j.marpol.2023.105512

Cited by 10 publications

(2 citation statements)

References 84 publications

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“…Kell et al, 2005;Dorner et al, 2013;Punt et al, 2014), and pursuing these research avenues is further encouraged to this day (Kjesbu et al, 2023). Our forecasting capacities using environmentally mediated SR models, however, remain generally insufficient to improve tactical management advice (Stige et al, 2013;Subbey et al, 2014;King et al, 2015;Haltuch et al, 2019;Maunder and Thorson, 2019;Uriarte et al, 2023). Fisheries management advice in the Northeast Atlantic (NEA), for instance, showed that environmentally driven recruitment is implemented in none of the 230 studied stock assessments, and in only 11 out of 102 short-term forecasts (Trenkel et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

Can regime shifts in reproduction be explained by changing climate and food availability?

Tirronen,

Depestele,

Kuparinen

2023

Front. Mar. Sci.

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Marine populations often show considerable variation in their productivity, including regime shifts. Of special interest are prolonged shifts to low recruitment and low abundance which occur in many fish populations despite reductions in fishing pressure. One of the possible causes for the lack of recovery has been suggested to be the Allee effect (depensation). Nonetheless, both regime shifts and the Allee effect are empirically emerging patterns but provide no explanation about the underlying mechanisms. Environmental forcing, on the other hand, is known to induce population fluctuations and has also been suggested as one of the primary challenges for recovery. In the present study, we build upon recently developed Bayesian change-point models to explore the contribution of food and climate as external drivers in recruitment regime shifts, while accounting for density-dependent mechanisms (compensation and depensation). Food availability is approximated by the copepod community. Temperature is included as a climatic driver. Three demersal fish populations in the Irish Sea are studied: Atlantic cod (Gadus morhua), whiting (Merlangius merlangus) and common sole (Solea solea). We demonstrate that, while spawning stock biomass undoubtedly impacts recruitment, abiotic and biotic drivers can have substantial additional impacts, which can explain regime shifts in recruitment dynamics or low recruitment at low population abundances. Our results stress the importance of environmental forcing to capture variability in fish recruitment.

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Section: Introductionmentioning

confidence: 99%

Can regime shifts in reproduction be explained by changing climate and food availability?

Tirronen,

Depestele,

Kuparinen

2023

Front. Mar. Sci.

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“…Catches recovered in the 90s but anchovy declined again leading to the collapse and closure of the fisheries between 2005 and 2010. Fisheries reopened adopting a biomass‐based catch bounded harvest strategy (up to 33 × 10 3 t), which currently corresponds to maximum harvest rates at or below 40% of the spawning biomass (see Uriarte et al., 2023, for a recent review). The population rebounded back to sustainable levels, with a historical highest abundance estimate above 200 × 10 3 t in 2021 (ICES, 2021b, see also Figure S1).…”

Section: Methodsmentioning

confidence: 99%

Shrinking body size of European anchovy in the Bay of Biscay

Taboada,

Chust,

Santos Mocoroa

et al. 2023

Global Change Biology

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Decreased body size is often cited as a major response to ocean warming. Available evidence, however, questions the actual emergence of shrinking trends and the prevalence of temperature‐driven changes in size over alternative drivers. In marine fish, changes in food availability or fluctuations in abundance, including those due to size‐selective fishing, provide compelling mechanisms to explain changes in body size. Here, based on three decades of scientific survey data (1990–2021), we report a decline in the average body size—length and weight—of anchovy, Engraulis encrasicolus L., in the Bay of Biscay. Shrinking was evident in all age classes, from juveniles to adults. Allometric adjustment indicated slightly more pronounced declines in weight than in total length, which is consistent with a change toward a slender body shape. Trends in adult weight were nonlinear, with rates accelerating to an average decline of up to 25% decade−1 during the last two decades. We found a strong association between higher anchovy abundance and reduced juvenile size. The effect of density dependence was less clear later in life, and temperature became the best predictor of declines in adult size. Theoretical analyses based on a strategic model further suggested that observed patterns are consistent with a simultaneous, opposing effect of rising temperatures on accelerating early growth and decreasing adult size as predicted by the temperature‐size rule. Macroecological assessment of ecogeographical—Bergmann's and James'—rules in anchovy size suggested that the observed decline largely exceeds intraspecific variation and might be the result of selection. Limitations inherent in the observational nature of the study recommend caution and a continued assessment and exploration of alternative drivers. Additional evidence of a climate‐driven regime shift in the region suggests, however, that shrinking anchovy sizes may signal a long‐lasting change in the structure and functioning of the Bay of Biscay ecosystem.

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Policy management of the Italian small pelagic fishery in the Adriatic Sea: A dynamic maximum economic yield approach

Natali,

Toraldo,

Giannino

et al. 2024

Ecological Economics

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Lessons learnt on the management of short-lived fish from the Bay of Biscay anchovy case study: Satisfying fishery needs and sustainability under recruitment uncertainty

Cited by 10 publications

References 84 publications

Can regime shifts in reproduction be explained by changing climate and food availability?

Can regime shifts in reproduction be explained by changing climate and food availability?

Shrinking body size of European anchovy in the Bay of Biscay

Policy management of the Italian small pelagic fishery in the Adriatic Sea: A dynamic maximum economic yield approach

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