Voluntary angler logbooks reveal long‐term changes in a lentic pike, <i><scp>E</scp>sox lucius</i>, population

Jansen, Teunis; Arlinghaus, Robert; Als, Thomas Damm; Skov, Christian

doi:10.1111/j.1365-2400.2012.00866.x

Cited by 34 publications

(20 citation statements)

References 31 publications

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“…Angler movement between lakes is relevant to the spread of diseases or non-native species (Papenfuss et al 2015) and can be analysed using network analysis. Jansen et al 2013). Arlinghaus 2004), gain insight into illegal activity, and determine angler responses to regulation changes or the quality of a fishery (e.g.…”

Section: Opportunitiesmentioning

confidence: 99%

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Angler apps as a source of recreational fisheries data: opportunities, challenges and proposed standards

2016

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Recreational fisheries surveys are limited in time and place in many countries. This lack of data limits scientific understanding and sustainable management. Smartphone applications (apps) allow anglers to record the details of their fishing trips and catches. In this study, we describe the opportunities and challenges associated with angler apps as a source of recreational fisheries data, and propose minimum standards for data collection via angler apps. Angler apps are a potentially valuable source of conventional and novel data that are both frequent and extensive, and an opportunity to engage anglers through data sharing and citizen science. Realizing this potential requires that we address significant challenges related to angler recruitment and retention, data quality and bias, and integration with existing fisheries programmes. We propose solutions to each of these challenges. Given that the angler app market is diverse, competitive and unpredictable, we emphasize minimum standards for data collection as a way to ensure large and reliable data sets that can be compared and integrated across apps. These standards relate to trips and catches, and angler demographics and behaviour, and should be supported through consultation and research. Angler apps have the potential to fundamentally change how anglers interact with the resource and with management.

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Section: Opportunitiesmentioning

confidence: 99%

“…economic assessments inArmstrong et al 2013;Monkman et al 2015). Two particularly relevant examples areJansen et al (2013), who used state-space modelling to compensate for missing logbook data, and Jiorle Two particularly relevant examples areJansen et al (2013), who used state-space modelling to compensate for missing logbook data, and Jiorle…”

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confidence: 99%

Angler apps as a source of recreational fisheries data: opportunities, challenges and proposed standards

2016

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“…Jansen et al, 2013;Cabanellas-Reboredo, 2014;Dunn, 2014;Eero, 2015). Such data is further expanded with new innovations (Schratwieser, 2014;Wilson, 2014) and by the help of the volunteers through the citizen science (Fairclough, 2014).…”

Section: Discussionmentioning

confidence: 99%

The co-existence of recreational and artisanal fisheries in the central parts of the Danube and Sava rivers

Treer

Kubatov²

2017

Croatian Journal of Fisheries

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The official data on recreational and artisanal fisheries in Croatia and Hungary were analysed. The data from Croatia relates to the entire Croatian section of the Danube River and to the section of the Sava River along the border with Bosnia and Herzegovina. The data from Hungary covers 60 km of the Danube River north of the Croatian border. Absolute catches in kilograms, as well as CPUE (kg per fisherman per year) by both groups in all three river sections varied from year to year without dramatic changes. Fishing with nets, artisanal fishermen differ from the anglers in two major ways: they are less selective and they catch bigger specimens. According to the official data, the existing ratio between recreational and artisanal fishermen in these three river sections does not negatively affect each other's or overall fishing. Therefore, a conclusion can be drawn that medium-intensive artisanal fisheries qualify to co-exist with recreational fisheries. How to CiteTreer, T., Kubatov, I. (2017): The co-existence of recreational and artisanal fisheries in the central parts of the Danube and Sava rivers. Croatian Journal of Fisheries, 75,[89][90][91][92][93][94]

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“…Acartia Area2 and CalanusCopepodites Area2 appeared to be highly correlated, i.e., with a Spearman's correlation coefficient exceeding the limit of 0.6 (Zuur et al ., ). To avoid violation of the basic assumption of independence, the multivariate analysis was divided into two starting models (Jansen et al ., ). Each model contained independent predictor variables only.…”

Section: Methodsmentioning

confidence: 97%

First‐year survival of North East Atlantic mackerel (Scomber scombrus) from 1998 to 2012 appears to be driven by availability of Calanus, a preferred copepod prey

Jansen

2016

Fisheries Oceanography

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Mackerel (Scomber scombrus) is one of the ecologically and economically most important fish species in the Atlantic. Its recruitment has, for unknown reasons, been exceptional from 1998 to 2012. The majority (75%) of the survivors in the first winter were found north of an oceanographic division at approximately 52°N, despite the fact that mackerel spawns over a wide range of latitudes. Multivariate time series modelling of survivor abundance in the north revealed a significant correlation with the abundance of copepodites (stage I–IV) of Calanus sp. in the spawning season (April to June). The copepodites were a mix of C. helgolandicus (dominating) and C. finmarchicus. The growth of mackerel larvae is known to be positively related to the availability of nauplii and copopodites of preferred prey species, namely, large calanoid copepod species such as Calanus. The statistical relationship between mackerel survivors and abundance of Calanus, therefore, most likely, reflected a causal relationship: high availability of Calanus probably reduced starvation, stage‐specific predation and cannibalism (owing to prey switching). The effects of other abundant, but less preferred zooplankton taxa, (Acartia sp., Branchiopoda spp. and Echinodermata spp. larvae), as well as stock size, temperature and wind‐induced turbulence were not found to be significant. However, stock size was retained in the final model because of a significant interaction with Calanus in oceanic areas west of the North European continental shelf. This was suggested to be a consequence of a density driven expansion of the spawning area that increased the overlap between early life stages of mackerel and food (Calanus) in new areas.

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Voluntary angler logbooks reveal long‐term changes in a lentic pike, Esox lucius, population

Cited by 34 publications

References 31 publications

Angler apps as a source of recreational fisheries data: opportunities, challenges and proposed standards

Angler apps as a source of recreational fisheries data: opportunities, challenges and proposed standards

The co-existence of recreational and artisanal fisheries in the central parts of the Danube and Sava rivers

First‐year survival of North East Atlantic mackerel (Scomber scombrus) from 1998 to 2012 appears to be driven by availability of Calanus, a preferred copepod prey

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