Assessment and modelling in freshwater fisheries

Pitcher, Tony J.

doi:10.1002/9781118394380.ch38

Cited by 6 publications

(3 citation statements)

References 82 publications

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“…60%) of total aquaculture, but only about 10% of total (reported) wild capture (Cooke et al, 2016; FAO, 2020b). Freshwater fisheries are critically important for regional food security and nutrition around the world, yet many species appear threatened by overfishing, pollution and habitat loss (Fluet‐Chouinard et al, 2018; Pitcher, 2015; Vianna et al, 2020). Due to the comparatively smaller scale, most freshwater fisheries are undervalued and overlooked, resulting in sparse data and few quantified reference points (Cooke et al, 2016; Pitcher, 2015).…”

Section: Resultsmentioning

confidence: 99%

“…Freshwater fisheries are critically important for regional food security and nutrition around the world, yet many species appear threatened by overfishing, pollution and habitat loss (Fluet‐Chouinard et al, 2018; Pitcher, 2015; Vianna et al, 2020). Due to the comparatively smaller scale, most freshwater fisheries are undervalued and overlooked, resulting in sparse data and few quantified reference points (Cooke et al, 2016; Pitcher, 2015). Given the scale of freshwater aquaculture and importance of sustainable freshwater fisheries, as well as the similarity of data‐poor conditions, the scenario approaches explored in this marine‐based study could feasibly be applied to freshwater systems.…”

Section: Resultsmentioning

confidence: 99%

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Biological life‐history and farming scenarios of marine aquaculture to help reduce wild marine fishing pressure

Froehlich,

Montgomery,

Williams

et al. 2023

Fish and Fisheries

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Aquaculture (freshwater and marine) has largely supplemented fisheries, but in theory could help reduce fishing pressure on wild stocks. Although not the sole factors, some potential benefits depend on aquaculture pressures on fished species, including collection of wild ‘seed’ material—earlier to later life stages—for rearing in captivity and the capacity of aquaculture to increase. Here we first classify 203 marine (saltwater and brackish) animal species as being produced by either open‐cycle capture‐based aquaculture (CBA) or closed‐cycle domesticated aquaculture (DA)—based on their likely reliance on wild seed—and assess the extent to which these forms of aquaculture could support seafood production and greater wild biomass. Using a data‐limited modelling approach, we find evidence that current aquaculture practices are not necessarily helping reduce fishing to sustainable levels for their wild counterparts—consistent with emerging scientific research. However, if some wild capture species (87 equivalent spp.) were instead produced through CBA, almost a million extra tonnes could theoretically be left in the wild, without reducing seafood production. Alternatively, if reliance on wild seed inputs is further reduced by shifting to DA production, then a little less than doubling of aquaculture of the overexploited species in our study could help fill the ‘production gap’ to support fishing at maximum sustainable levels. While other ecological (e.g. escapes), social and economic considerations (e.g. market substitution) are important, we focused on a critical biological linkage between wild fisheries and aquaculture that provides another aspect on how to improve management alignment of the sectors.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Biological life‐history and farming scenarios of marine aquaculture to help reduce wild marine fishing pressure

Froehlich,

Montgomery,

Williams

et al. 2023

Fish and Fisheries

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“…This has been done in the USA (Karr, 1981(Karr, , 1987 and, more recently, in EU countries (Jepsen and Pont, 2007;Pont et al, 2007). However, the universal application of ichthyological indices can still be hampered by regional and local differences in the structure of ichthyocenoses, complex definitions in terms of reference conditions, and different effective monitoring objectives (Stojković et al, 2011;Pitcher, 2015;Radinger et al, 2019). For the territory of Serbia, there has not been an application of the IBI index, however, the initial studies were conducted in Stojković et al (2013).…”

Section: Introductionmentioning

confidence: 99%

Assessment of the ecological sustainability of river basins based on the modified the ESHIPPOfish model on the example of the Velika Morava basin (Serbia, Central Balkans)

Simić

Bănăduc

Curtean–Bănăduc

et al. 2022

Front. Environ. Sci.

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This study examines the ecological sustainability of the Velika Morava River Basin (Serbia, Central Balkans) under modern conditions of multiple freshwater stressors, including climate change. The impact of stressors on the ecological services of the river basin is considered, including: drinking water, irrigation, recreation, tourism, ecotourism, and fishing. In order to assess the ecological sustainability of the river basin, a modification of the ESHIPPO model was performed. The essence of the modification is a change to the ES component, which, in the basic model, assesses the degree of ecological specialization of a taxon; and in the modified assessment of the ecological stability of the ecosystem (ESE). The structure of ichthyocenosis is used as the basic biological indicator for the assessment of ESE. The assessment of river basin sustainability was obtained as the difference between ESE and the impact of multiple factors, including: habitat change, invasive species, pollution, human population growth (social factors), and the over-exploitation of resources (HIPPO). The statistical analysis (SOM—Self Organizing Map) highlights the most reliable indicators of both biotic (ichthyocenosis structure elements) and the indicators that best detect the influence of HIPPO factors. The structure of the model is based on general and easily measurable indicators, which enables its application in any river basin in the world. The results of the model indicate that 80% of the studied basin is ecologically unsustainable and that its potential environmental services are greatly reduced.

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