Exploring long-term variability of Nephrops norvegicus landing per unit effort (LPUE) off North Galicia (NW Spain)

Herraiz, Isabel González; Fariña, Antonio; Freire, Juan; Torre, José Ramón Cancelo de la

doi:10.1016/j.fishres.2014.12.020

Cited by 2 publications

(2 citation statements)

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“…Other kind of factors apart from fishing could also be involved in the observed dynamics of the Nephrops biomass. Thus, the decrease of Nephrops CPUE in Porcupine Bank has been related to an increase in temperature and frequency of storms (Gonzaĺez Herraiz et al, 2009) but that was not the case in FU 25 (Gonzaĺez Herraiz et al, 2015). The comparison of the temperature at the depth ranges that Nephrops inhabit (around 300-600 m) (Lavıń et al, 2006;Punzoń et al, 2016;Punzoń et al, 2021) with the FU 25, FU 26 and FU 31 Nephrops biomass indices have not provided conclusive results (Figures 5A-C).…”

Section: Stocks Statusmentioning

confidence: 93%

“…The effect of the high fishing mortality could lead up to the point where females do not find males for mating (sperm limitation). In the worst case, low quantities of males could have decreased the reproduction potential of the population (ICES, 2013) and could therefore affect recruitment in subsequent years (Gonzaĺez Herraiz et al, 2015).…”

Section: Stocks Statusmentioning

confidence: 99%

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First Maximum Sustainable Yield advice for the Nephrops norvegicus stocks of the Northwest Iberian coast using stochastic Surplus Production model in Continuous Time (SPiCT)

et al. 2023

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The assessment of the status of fisheries resources is pivotal due to the importance of marine resources in global food security and to halt the ongoing decline in marine biodiversity. Norway lobster (Nephrops norvegicus) is one of the most valuable resources in the Northeast Atlantic. However, overfishing has caused the decline of several Nephrops stocks over the last decades, particularly in the Nephrops Functional Units (FUs) 25 (NW Spain), 26-27 (NW Spain and North Portugal) and 31 (Cantabrian Sea, North Spain). Since 2003, the information provided by the very low level of landings and fishing effort of these three stocks was insufficient to carry out an adequate analytical assessment, so the base of the assessment has been the trends from commercial catch per unit effort (CPUE). The objective of this study was to carry out the first assessment of these three stocks with an analytical MSY-based model. A review of the available data was made and the stochastic Surplus Production Model in Continuous Time (SPiCT) was fitted for each FU. The results indicate an extremely low biomass for FUs 25 and 26-27 since the mid-nineties well below the reference points. For FU 31, on the other hand, estimated biomass is larger. Our findings also identified long-term temporal and spatial changes in the population dynamic of Nephrops in the Northwest Iberian coast. The results were compare with those obtained in the same stocks with other data-limited methods. Also the role of abiotic factors on the observed dynamic of the stocks was explored. The results of this study are not only relevant for the sustainable exploitation of Norway lobster stocks off the Northwest Iberian coast but provide valuable insights into the suitability and limitations of production models for the assessment of crustacean stocks in general.

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Section: Stocks Statusmentioning

confidence: 93%

Section: Stocks Statusmentioning

confidence: 99%

First Maximum Sustainable Yield advice for the Nephrops norvegicus stocks of the Northwest Iberian coast using stochastic Surplus Production model in Continuous Time (SPiCT)

et al. 2023

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A tale of two seas: a meta‐analysis of crustacean stocks in the NE Atlantic and the Mediterranean Sea

Vasilakopoulos

Maravelias

2015

Fish and Fisheries

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Meta‐analysis of marine biological resources can elucidate general trends and patterns to inform scientists and improve management. Crustacean stocks are indispensable for European and global fisheries; however, studies of their aggregate development have been rare and confined to smaller spatial and temporal scales compared to fish stocks. Here, we study the aggregate development of 63 NE Atlantic and Mediterranean crustacean stocks of six species (Nephrops norvegicus, Pandalus borealis, Parapenaeus longirostris, Aristeus antennatus, Aristaeomorpha foliacea and Squilla mantis) in 1990–2013 using biomass index data from official stock assessments. We implemented a dynamic factor analysis (DFA) to identify common underlying trends in biomass indices and investigate the correlation with the North Atlantic Oscillation (NAO) index. The analysis revealed increasing and decreasing trends in the northern and southern NE Atlantic, respectively, and stable or slowly increasing trends in the Mediterranean, which were not related to NAO. A separate meta‐analysis of the fishing mortality (F) and biomass (B) of 39 analytically assessed crustacean stocks was also carried out to explore their development relative to MSY. NE Atlantic crustacean stocks have been exploited on average close to FMSY and remained well above BMSY in 1995–2013, while Mediterranean stocks have been exploited 2–4 times above FMSY in 2002–2012. Aggregate trends of European crustacean stocks are somewhat opposite to trends of fish stocks, suggesting possible cascading effects. This study highlights the two‐speed fisheries management performance in the northern and southern European seas, despite most stocks being managed in the context of the European Union's Common Fisheries Policy.

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Exploring long-term variability of Nephrops norvegicus landing per unit effort (LPUE) off North Galicia (NW Spain)

Cited by 2 publications

References 21 publications

First Maximum Sustainable Yield advice for the Nephrops norvegicus stocks of the Northwest Iberian coast using stochastic Surplus Production model in Continuous Time (SPiCT)

First Maximum Sustainable Yield advice for the Nephrops norvegicus stocks of the Northwest Iberian coast using stochastic Surplus Production model in Continuous Time (SPiCT)

A tale of two seas: a meta‐analysis of crustacean stocks in the NE Atlantic and the Mediterranean Sea

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