Fishers' and scientific histories: an example of consensus from an inland fishery

Philippsen, Juliana Strieder; Minte-Vera, Carolina V.; Okada, Edson Kiyoshi; Carvalho, Adriana Rosa; Angelini, Ronaldo

doi:10.1071/mf16053

Cited by 4 publications

(2 citation statements)

References 41 publications

(63 reference statements)

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“…Inspection of fishing data reliability is crucial. These data are unlikely to provide standardized observations with no bias, mainly when informed by fishers, and expecting otherwise is a false assumption critical to fisheries management (Strieder Philippsen et al, 2017). Furthermore, it is crucial to bear in mind that the pandemic COVID-19 circumstances affecting the world since 2020 reduced fishing activity (Bennett et al, 2020), reducing landing data collection.…”

Section: Data Fitting Prospects and Caveats Of Benford Analysismentioning

confidence: 99%

Reporting the accuracy of small-scale fishing data by simply applying Benford’s law

et al. 2022

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Small-scale fisheries (SSFs) play essential economic, social, and cultural roles for many fleets in the Atlantic region. The basis of fisheries assessment and management is the landings reported by observers or fishers. Even though the information from the landings is essential, it can be subject to a fisher’s bias, such as the tendency to inflate catches and the refusal to fill the logs. The feasibility for managers using field surveys to validate these datasets is held up by the high costs, shortage in monitoring, and the lack of prior information. Alternatively, Benford analysis overcomes those limitations since it can be applied directly on the logbook data. This method is growing in popularity, underlining its suitability to many economic and biological fields. Hence, in this study, we inspected small-scale fisheries data by the Benford’s distribution, aiming to validate fish landing data from 27 points in Brazil’s northeastern region over 3 years. Our results suggest that 20% of landings data are considered highly imprecise (misinformation), especially from non-motorized canoes. Also, harbors in remote locations provide poorer quality data, specifically monthly catch values reported by several boats. The way we mine our data affects the sensitivity of the analysis, with monthly data being less prone to be accessed by this method than daily information. As the results match our prior knowledge on the location, we endorse the suitability of the method and reliability for assessing accuracy in fishing data. Hence, we recommend that it ought to be used as an audit tool for SSF landing data aiming to enlighten data reliance and support managers for planning management actions.

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Section: Data Fitting Prospects and Caveats Of Benford Analysismentioning

confidence: 99%

Reporting the accuracy of small-scale fishing data by simply applying Benford’s law

et al. 2022

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“…New fish stock assessment approaches have been developed to deal with the data availability problem associated with small-scale and inland fisheries. These new approaches are mostly based on the acquired knowledge of fishers concerning the exploited resources (Wilson et al 2003, Medley 2009, Wakeford et al 2008, an information source that has been increasingly recognized as reliable for detecting changes in catches over time (Philippsen et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Stock assessment of Prochilodus nigricans (Actinopterygii: Characiformes: Prochilodontidae) using two distinct algorithms, in the context of a small-scale Amazonian fishery

Catarino¹,

Kahn²,

Freitas³

2019

Acta Ichthyol. Piscat.

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assessment of Prochilodus nigricans (Actinopterygii: Characiformes: Prochilodontidae) using two distinct algorithms, in the context of a small-scale Amazonian fishery. Acta Ichthyol. Piscat. 49 (4): 373-380. Background. Despite the importance of inland fishery, assessments of exploited inland stocks have relied on datadeficient databases, mainly in developing countries. In this paper, we employed two distinct analytical methods to evaluate the stock status of Prochilodus nigricans Spix et Agassiz, 1829, the most important fish in the Amazonian freshwater landings. In this study, we intended to test the sustainability of small-scale fisheries comparing two different methods. Materials and methods. The population dynamic of P. nigricans was studied using length and weight data for fish caught in Manacapuru Lake and the lower stretch of the Solimões River. Estimates of maximum sustainable yield and corresponding fishing mortality for 2012 and 2013, using Beverton-Holt curve, indicated an overfishing status for both years. At the same region, fishers were interviewed and their knowledge on the P. nigricans stock status was assessed using a stock assessment methodology based on fishers' knowledge, known as ParFish. Results. Both yield per recruit curves employed to assess the stock status of P. nigricans in 2012 and 2013 and ParFish approach indicate an overfishing status, but ParFish also found a high uncertainty level around 47%. Conclusion. The use of ParFish algorithm and traditional knowledge can provide qualitatively similar results to conventional models, such as the Beverton-Holt approach. The ParFish approach shows the advantage including confidence intervals to its estimates.

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Assessing fishing impacts in a tropical reservoir through an ecosystem modeling approach

Philippsen

Minte-Vera

Coll

et al. 2018

Rev Fish Biol Fisheries

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Ecological models are useful for evaluating fishery management scenarios, as they allow researchers to investigate alternative fishing effort, as well as varying environmental and trophic interaction scenarios. Through an ecosystem modeling approach (Ecopath with Ecosim), we addressed the possible impacts of small-scale fisheries on the structure and functioning of a tropical ecosystem (Itaipu Reservoir, Brazil). We found that fishing effects and predator-prey interactions were the main drivers explaining catch trends in the Itaipu Reservoir fisheries. The mean trophic level of catch did not change throughout the analyzed time period and no losses in secondary production from exploitation (L index) were observed, indicating that Itaipu fisheries are sustainable regarding ecosystem effects. The negative impacts of introduced species on native species seem to be greater than the fishing impacts. Fishing simulations from the ecosystem Maximum Sustainable Yield (MSY) reduced the biomass of some important species in the local fishery. Regarding management advice, our results indicate that fishing efforts should not be increased for curimba (Prochilodus lineatus), pintado (Pseudoplatystoma corruscans),

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Fishers' and scientific histories: an example of consensus from an inland fishery

Cited by 4 publications

References 41 publications

Reporting the accuracy of small-scale fishing data by simply applying Benford’s law

Reporting the accuracy of small-scale fishing data by simply applying Benford’s law

Stock assessment of Prochilodus nigricans (Actinopterygii: Characiformes: Prochilodontidae) using two distinct algorithms, in the context of a small-scale Amazonian fishery

Assessing fishing impacts in a tropical reservoir through an ecosystem modeling approach

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