Modeling artisanal coastal fisheries of Galicia (NW Spain) based on data obtained from fishers: the case of &lt;i&gt;Octopus vulgaris&lt;/i&gt;

Otero, Jaime; Rocha, Francisco; González, Ángel F.; Gracia, Joaquín; Guerra, Ángel

doi:10.3989/scimar.2005.69n4577

Cited by 54 publications

(56 citation statements)

References 16 publications

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“…There are studies, however, that have used interviews simultaneously with other methods to assess fisheries. Some of the researchers, when studying the same fisheries, found similar trends and reached similar or complementary conclusions (e.g., Neis et al 1999, Otero et al 2005, Begossi 2008, Lozano-Montes et al 2008. However, others generated mixed results; that is, there were similarities in some indices and not in others (Ainsworth and Pitcher 2005, Daw 2008, Silvano and Valbo-Jørgensen 2008.…”

Section: Methodological Issuesmentioning

confidence: 84%

“…They found that accuracy can be a serious problem in the assessment of the resource and suggested that the accuracy assumption built into the interview data must be explicitly stated. Otero et al (2005) compared catch rates and total catch from interviews with official reports. They found that the two sources correlated positively, but that the total catch from interviews was higher than the official one, which, they suggested, was the result of unreported catch not being included in the official statistics.…”

Section: Methodological Issuesmentioning

confidence: 99%

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Assessing Changes in Fisheries Using Fishers’ Knowledge to Generate Long Time Series of Catch Rates: a Case Study from the Red Sea

Tesfamichael¹,

Pitcher²,

Pauly³

2014

E&S

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ABSTRACT. The data requirements for most quantitative fishery assessment models are extensive, and most of the fisheries in the world lack time series of the required biological and socioeconomic data. Many innovative approaches have been developed to improve data collection for fisheries. We explored the use of data from fishers' interviews to estimate time series of approximate "best" catch rates. A total of 472 standardized interviews were conducted with 423 fishers along the southern Red Sea coast recording the best catch recalled and the change in average catch rates throughout the fishing career of interviewees. The results showed a decline of best catch rates in all fisheries, ranging from 4% to 10% per year for more than 50 years. The estimated rates of decline of the typical catch were higher for fishers who started fishing in recent years, suggesting that the resource base is declining, in concordance with other indicators. It is suggested that analysis of approximate data, quickly acquired at low cost from fishers through interviews, can be used to supplement other data-recording systems or used independently to document the changes that have occurred in the resource base over a lifetime of fishing. The results can be used to guide the assessment and management of resources to conserve ecosystems and livelihoods.

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Section: Methodological Issuesmentioning

confidence: 84%

Section: Methodological Issuesmentioning

confidence: 99%

Assessing Changes in Fisheries Using Fishers’ Knowledge to Generate Long Time Series of Catch Rates: a Case Study from the Red Sea

Tesfamichael¹,

Pitcher²,

Pauly³

2014

E&S

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“…Neis et al, 1999;Begossi, 2008;Lozano-Montes, Pitcher & Haggan, 2008) and disagree (e.g. Otero et al, 2005;Daw, 2008), raising concerns about the accuracy of fisher knowledge. Work reviewed by Daw (2008) illustrates that it is easier to recall events that are unusual or rare, especially if they were positive (e.g.…”

Section: Introductionmentioning

confidence: 99%

How does the accuracy of fisher knowledge affect seahorse conservation status?

O'Donnell

Pajaro

Vincent

2010

Animal Conservation

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Despite a growing interest in incorporating fisher knowledge into quantitative conservation assessments, there remain practical impediments to its use. In particular, there is some debate about the accuracy of fisher knowledge. In this study, we report an attempt to quantify assumptions about how accurately fishers report past events (retrospective bias). Then we examine how the assumption we make about retrospective bias affects the characterization of changes in the fishery and extinction risk. We link fisher interviews and fisher logbooks to establish a catch rate (catch per unit of effort) trend for the history of a data-poor, small-scale seahorse fishery in the Philippines. We find that fishers perceive historic declines in fishing rate that are not apparent in more recent logbook trends, and the extent of the decline (and therefore extinction risk) hinges on assumptions we make about the accuracy of fisher recall. Scenarios that ignore retrospective bias result in the most severe declines and the most worrying extinction risk classifications. Furthermore, the historic baseline set by interviews suggests that relying on recent decades of data alone may underestimate extinction risk for our study species, and others that have been historically exploited. Attempting to link interviews with logbooks also illustrates differences between fisher-derived datasets: retrospective interviews may exaggerate early fishing rates and capture less variability than logbooks. In addition to being the first seahorse fishery reconstruction, our work contributes to the emerging interest in how fisher knowledge can guide conservation assessment. Future studies that incorporate fisher knowledge into quantitative assessments require (1) clearly stated assumptions about fisher knowledge bias; (2) clear criteria to compare fisher knowledge collected with different methods; (3) evaluation of the impact of assumptions on assessments.

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“…In this context, alternative methodologies and models have been used variously to estimate catch and catch per unit effort (CPUE) in smallscale fisheries (Gómez-Muñoz, 1990;Hoening et al, 1997;Kirchner and Beyer, 1999;Neis et al, 1999;Arnaiz et al, 2002;Otero et al, 2005;Young et al, 2006). Among these, Gómez-Muñoz (1990) developed a simple model to estimate catch and catch per unit effort (CPUE) in multispecies small-scale fisheries.…”

mentioning

confidence: 99%

“…Among these, Gómez-Muñoz (1990) developed a simple model to estimate catch and catch per unit effort (CPUE) in multispecies small-scale fisheries. This model has been applied in Galician small-scale fisheries for squid and octopus and larger scale fisheries for monkfish (Simón et al, 1996;Otero et al, 2005;Rocha et al, 2004). The method involves an interview survey of fishing sector personnel (e.g.…”

mentioning

confidence: 99%

Modelling small-scale coastal fisheries of Galicia (NW Spain) based on data obtained from fisheries: the case of <i>Sepia officinalis</i>

et al. 2006

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Modeling artisanal coastal fisheries of Galicia (NW Spain) based on data obtained from fishers: the case of <i>Octopus vulgaris</i>

Cited by 54 publications

References 16 publications

Assessing Changes in Fisheries Using Fishers’ Knowledge to Generate Long Time Series of Catch Rates: a Case Study from the Red Sea

Assessing Changes in Fisheries Using Fishers’ Knowledge to Generate Long Time Series of Catch Rates: a Case Study from the Red Sea

How does the accuracy of fisher knowledge affect seahorse conservation status?

Modelling small-scale coastal fisheries of Galicia (NW Spain) based on data obtained from fisheries: the case of <i>Sepia officinalis</i>

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Modeling artisanal coastal fisheries of Galicia (NW Spain) based on data obtained from fishers: the case of <i>Octopus vulgaris</i>

Cited by 54 publications

References 16 publications

Assessing Changes in Fisheries Using Fishers&#8217; Knowledge to Generate Long Time Series of Catch Rates: a Case Study from the Red Sea

Assessing Changes in Fisheries Using Fishers&#8217; Knowledge to Generate Long Time Series of Catch Rates: a Case Study from the Red Sea

How does the accuracy of fisher knowledge affect seahorse conservation status?

Modelling small-scale coastal fisheries of Galicia (NW Spain) based on data obtained from fisheries: the case of <i>Sepia officinalis</i>

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Assessing Changes in Fisheries Using Fishers’ Knowledge to Generate Long Time Series of Catch Rates: a Case Study from the Red Sea

Assessing Changes in Fisheries Using Fishers’ Knowledge to Generate Long Time Series of Catch Rates: a Case Study from the Red Sea