Interdecadal variability of anchoveta abundance and overcapacity of the fishery in Peru

Fréon, Pierre; Bouchón, Marilú; Mullon, Christian; García, Christian Martín; Ñiquen, Miguel

doi:10.1016/j.pocean.2008.10.011

Cited by 71 publications

(49 citation statements)

References 14 publications

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“…9). At least in the case of the northern BC system, there is no evidence for the occurrence of "pseudocycles", as they were described for the Humboldt Current (Freon, 2008). It has been postulated that the sardine decline is related to the aggravated oxygen condition in the spawning areas on the Namibian shelf Kreiner et al, 2009).…”

Section: Northern Benguela Upwelling Systemmentioning

confidence: 97%

Impacts of hypoxia on the structure and processes in pelagic communities (zooplankton, macro-invertebrates and fish)

et al. 2010

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Abstract. Dissolved oxygen (DO) concentration in the water column is an environmental parameter that is crucial for the successful development of many pelagic organisms. Hypoxia tolerance and threshold values are species-and stagespecific and can vary enormously. While some fish species may suffer from oxygen values of less than 3 mL O 2 L −1 through impacted growth, development and behaviour, other organisms such as euphausiids may survive DO levels as low as 0.1 mL O 2 L −1 . A change in the average or the range of DO may have significant impacts on the survival of certain species and hence on the species composition in the ecosystem with consequent changes in trophic pathways and productivity.Evidence for the deleterious effects of oxygen depletion on pelagic species is scarce, particularly in terms of the effect of low oxygen on development, recruitment and patterns of migration and distribution. While planktonic organisms have to cope with variable DOs and exploit adaptive mechanisms, nektonic species may avoid areas of unfavourable DO and develop adapted migration strategies. Planktonic organisms may only be able to escape vertically, above or beneath the Oxygen Minimum Zone (OMZ). In shallow areas only the surface layer can serve as a refuge, but in deep waters many organisms have developed vertical migration strategies to use, pass through and cope with the OMZ.Correspondence to: W. Ekau (wekau@zmt-bremen.de) This paper elucidates the role of DO for different taxa in the pelagic realm and the consequences of low oxygen for foodweb structure and system productivity. We describe processes in two contrasting systems, the semi-enclosed Baltic Sea and the coastal upwelling system of the Benguela Current to demonstrate the consequences of increasing hypoxia on ecosystem functioning and services.

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Section: Northern Benguela Upwelling Systemmentioning

confidence: 97%

Impacts of hypoxia on the structure and processes in pelagic communities (zooplankton, macro-invertebrates and fish)

et al. 2010

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“…More specifically, recent publications suggest that a major consequence of this future scenario may be the need to rely on small pelagic species for direct human consumption (Pauly et al 2003), which, as can be seen in Table 2, show considerably higher ep-EROI values than any other fishery assessed if captured using specific fishing techniques. Having said this, it is important to mention that small pelagic species tend to show strong annual variations in stock abundance (Pauly et al 1998;Fréon et al 2008). Therefore, further fishing pressure on these stocks may increase their vulnerability (Allison et al 2009).…”

Section: Eroi (%)mentioning

confidence: 99%

Edible Protein Energy Return on Investment Ratio (ep-EROI) for Spanish Seafood Products

Vázquez‐Rowe

Villanueva-Rey

Moreira

et al. 2013

AMBIO

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Life cycle assessment (LCA) has developed into a useful methodology to assess energy consumption of fishing fleets and their derived seafood products, as well as the associated environmental burdens. In this study, however, the life cycle inventory data is used to provide a dimensionless ratio between energy inputs and the energy provided by the fish: the edible protein energy return on investment (ep-EROI). The main objective was to perform a critical comparison of seafood products landed in Galicia (NW Spain) in terms of ep-EROI. The combination of energy return on investment (EROI) with LCA, the latter having standardized mechanisms regarding data acquisition and system boundary delimitation, allowed a reduction of uncertainties in EROI estimations. Results allow a deeper understanding of the energy efficiency in the Galician fishing sector, showing that small pelagic species present the highest ep-EROI values if captured using specific fishing techniques. Finally, results are expected to provide useful guidelines for policy support in the EU's Common Fisheries Policy.

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“…Excess capacity had clearly become a problem [40]. Since then, overcapacity of the anchovy fleet and processing capacity has been a consistent feature of the anchovy fishery [11,12,46,49].…”

Section: First Impact: Changes In Distribution Of Anchovy Shoals Withmentioning

confidence: 99%

“…Annual current catches are around 7-8 million tons [10] captured by almost 1200 purse seiners locally known as bolicheras [11]. Ninety nine percent of anchovy catches are reduced to fishmeal and fish oil by around 140 processing factories [6,12]. The fishery is mono-specific [13,14]; since at least 90% of the catches consist of one fish species: anchovy or anchoveta (Engraulis ringens).…”

Section: Introductionmentioning

confidence: 99%

Coping Strategies to Deal with Environmental Variability and Extreme Climatic Events in the Peruvian Anchovy Fishery

2011

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Abstract:The Peruvian anchovy fishery is the largest worldwide in terms of catches. The fishery started during the mid 1950s, and since then it has been highly dependent on natural stock fluctuations, due to the sensitivity of anchovy stocks to ocean-climate variability. The main driver of anchovy stock variability is the El Niño Southern Oscillation (ENSO), and three extreme ENSO warm events were recorded in

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Interdecadal variability of anchoveta abundance and overcapacity of the fishery in Peru

Cited by 71 publications

References 14 publications

Impacts of hypoxia on the structure and processes in pelagic communities (zooplankton, macro-invertebrates and fish)

Impacts of hypoxia on the structure and processes in pelagic communities (zooplankton, macro-invertebrates and fish)

Edible Protein Energy Return on Investment Ratio (ep-EROI) for Spanish Seafood Products

Coping Strategies to Deal with Environmental Variability and Extreme Climatic Events in the Peruvian Anchovy Fishery

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