Estimating population size of the red swamp crayfish (<i>Procambarus clarkii</i>) in fish-ponds (Brenne, Central France)

Coignet, Aurore; Pinet, François; Souty‐Grosset, Catherine

doi:10.1051/kmae/2012019

Cited by 10 publications

(10 citation statements)

References 22 publications

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“…By catching and measuring all age groups, it is also possible to make an assessment of the number of reproducing individuals and highlight any visible population growth trends (Rabeni et al, 1997;Paillisson et al, 2011). Another technique to evaluate population size is CMR which is a promising option in smaller ponds (Coignet et al, 2012).…”

Section: Data Collectionmentioning

confidence: 99%

Measures to Control Invasive Crayfish Species in Switzerland: A Success Story?

Krieg

King

Zenker

2020

Front. Environ. Sci.

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Invasive crayfish species were first documented in Switzerland in the 1970s. Today, North American crayfish species dominate in most major lakes and streams in Switzerland. In combination with the crayfish plague, they pose a substantial threat to our native crayfish. Over the past 20 years, various techniques have been applied to reduce negative impacts of these invasive crayfish in Switzerland: eradication (temporary drainage or destruction of a water system, biocides), suppression (intensive trapping, electricity introduction of predatory fish) and containment (construction of crayfish barriers). Temporary drainage or filling-in of isolated ponds, in combination with calcium hydroxide application has been successful in eradicating populations of invasive crayfish. However, trapping and introduction of predatory fish led to a reduction in population density but neither method has ever caused the extinction of a population. Invasive crayfish have not yet reached crayfish barriers, therefore, long-term functionality of these barriers still needs to be proven. Nevertheless, functional controls with native crayfish have shown that barriers prevent their upstream movement. Implementation of crayfish barriers is the most promising method to protect native crayfish from displacement by invasive crayfish species. Many measures are expensive, time consuming, and show little or no success in controlling invasive crayfish. Therefore, we recommend to focus on implementing drastic measures, such as filling-in or draining of isolated waters or a combination of various methods to maximise the reduction of population size.

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Section: Data Collectionmentioning

confidence: 99%

Measures to Control Invasive Crayfish Species in Switzerland: A Success Story?

Krieg

King

Zenker

2020

Front. Environ. Sci.

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“…It would also be highly relevant in other settings, notably when water bodies are directly connected to each other by aquatic corridors. This situation is commonly observed in another major French wetland area, the Brenne, where red swamp crayfish have spread rapidly (Coignet, Pinet, & Souty‐Grosset, ). Such actions, of course, cannot prevent any transport of crayfish, especially by humans.…”

Section: Conclusion and Recommended Management Directionsmentioning

confidence: 80%

Is it a hindrance for an invasive aquatic species to spread across scattered habitat patches?

Tréguier

Roussel

Bélouard

et al. 2018

Aquatic Conservation

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1. Despite their importance for aquatic biodiversity, ponds are among the most vulnerable freshwater habitats. Owing to their isolation in terrestrial environments, ponds are expected to be relatively well protected from biological invasions, but this depends on many factors.2. The purpose of this study was to examine the influence of a range of variables (water quality, habitat, and landscape attributes) on the colonization of discrete ponds by a widespread aquatic invader, the red swamp crayfish Procambarus clarkii, which can disperse overland.3. Investigations were conducted in two networks of ponds, each located in close proximity to a large invaded marsh. The two marshes under study differed in the length of time since the crayfish were introduced.4. The proportions of colonized ponds and crayfish abundances were moderate in both networks, but higher in the network that had been invaded first. In both networks the distance to the marsh was the main predictor of pond colonization, considering similar energy costs to cross aquatic and terrestrial habitats for the recently invaded network, but assuming that dispersal was 25 times costlier across the terrestrial matrix than via streams for the earlier invaded network. Pond characteristics had no influence on crayfish occurrence in either network. Furthermore, predictions of pond invasion were lower for the recently invaded network. 5. The importance of the distance to the marsh indicates that natural dispersal was the main process of pond colonization by crayfish. Findings also suggested that overland dispersal was rare and costly. By contrast, streams were probably significant in facilitating crayfish dispersal. Differences between the two networks might arise from an invasion process still in progress in the recently invaded network. 6. From a management viewpoint, local actions are encouraged to prevent the spread of crayfish via streams. In addition, broader-scale actions to mitigate other human disturbances would improve the outlook for pond biodiversity.

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“…Young-of-the-year crayfish (YOY) may pass through the mesh of the traps or are dissuaded to enter the traps, and are hardly observable during active search (hand removal, electrofishing, etc.) (Dana et al, 2010;Coignet et al, 2012). Dragging with a fine-mesh size reported high captures of YOY in a reservoir from southern Portugal invaded with P. clarkii (Adão and Marques, 1993).…”

Section: Introductionmentioning

confidence: 97%

Traps and netting, better together than alone: an innovative approach to improve Procambarus clarkii management

García-de-Lomas

Dana

González

2020

Knowl. Manag. Aquat. Ecosyst.

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The red swamp crayfish Procambarus clarkii is the most widespread invasive crayfish in Europe, and responsible for a plethora of negative impacts on aquatic ecosystems. Most capture methods used for controlling crayfish populations have a bias towards the capture of adults, however, the removal of the young-of-the-year crayfish (YOY) may be essential for achieving effective control of invasive populations. This paper analysed the crayfish caught during a management campaign carried out in five permanent stream pools from southern Spain. We compared size structure, CPUE and sex-ratio obtained with two control methods: cylindrical traps (a method commonly used in crayfish management) and horizontal hauls using a fine-mesh net (inspired by zooplankton sampling techniques). Horizontal hauls showed a higher selectivity for catching YOY and higher efficiency (eight-fold) than traps. The combined use of both gears increased total catch by 46%. Our results suggest that YOY may be sharply underestimated if only cylindrical traps are used. The YOY cohort represented 60% of the total catch during the management campaign. Therefore, active netting with a fine mesh may be a complementary method to the use of traps in order to manage invasive populations of P. clarkii and may provide a better understanding of the structure and dynamics of invasive crayfish populations.

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Estimating population size of the red swamp crayfish (Procambarus clarkii) in fish-ponds (Brenne, Central France)

Cited by 10 publications

References 22 publications

Measures to Control Invasive Crayfish Species in Switzerland: A Success Story?

Measures to Control Invasive Crayfish Species in Switzerland: A Success Story?

Is it a hindrance for an invasive aquatic species to spread across scattered habitat patches?

Traps and netting, better together than alone: an innovative approach to improve Procambarus clarkii management

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