scholarly journals Disease risks associated with the importation and release of non-native crayfish species into mainland Britain

2012 ◽  
Vol 16 (1) ◽  
pp. 1-15 ◽  
Author(s):  
M Longshaw ◽  
KS Bateman ◽  
P Stebbing ◽  
GD Stentiford ◽  
FA Hockley
Keyword(s):  
Disease Risks ◽  
Native Crayfish ◽  
Crayfish Species

Vulnerability of Southwest Iberian amphibians to an introduced crayfish, Procambarus clarkii

2005 ◽  
Vol 26 (3) ◽  
pp. 293-303 ◽  
Author(s):  
Rui Rebelo ◽  
Maria João Cruz
Keyword(s):  
Procambarus Clarkii ◽  
Larval Survival ◽  
Bufo Bufo ◽  
Microhabitat Use ◽  
Amphibian Species ◽  
Embryo Survival ◽  
Breeding Habitats ◽  
Mesocosm Experiments ◽  
Native Crayfish ◽  
Crayfish Species

AbstractThe introduction of predators in amphibian breeding habitats may contribute to the decline or extinction of amphibian populations. Procambarus clarkii, a North American crayfish, was recently introduced in the Iberian Peninsula, being now quite abundant in the southwest, a region with no native crayfish species and where 13 amphibian species may be found. We performed mesocosm experiments to evaluate the vulnerability of amphibian embryos and larvae from those species to P. clarkii. Despite the presence of alternative food (vegetation and leaf litter), embryo survival in the presence of P. clarkii was low for all species except Bufo bufo. However, newly hatched B. bufo tadpoles were readily consumed. P. clarkii reduced larval survival in all species, with those species that in nature have few contacts with predators at the larval stage suffering the highest mortalities. Most larvae reduced their activity and/or altered microhabitat use in the presence of P. clarkii, but these behavioural modifications did not lead necessarily to a low vulnerability to predation.

Age, growth, and condition of the Mud River crayfish Orconectes ronaldi Taylor 2000 (Decapoda: Cambaridae)

2015 ◽  
Vol 21 (1) ◽  
pp. 115-121
Author(s):  
Hannah Noss ◽  
Wendy Anderson ◽  
Thomas P. Simon
Keyword(s):  
Statistical Difference ◽  
Sexually Dimorphic ◽  
Allometric Growth ◽  
Native Range ◽  
South Central ◽  
Length Width ◽  
Wet Weight ◽  
Native Crayfish ◽  
Sexually Mature ◽  
Crayfish Species

Abstract The Mud River crayfish, Orconectes ronaldi Taylor, is a native crayfish species found in the Midwestern United States in Kentucky and Indiana. Length-weight relationship, body morphometric relationship, and condition within the species native range in south-central Indiana were studied. Growth, size relationships based on gender, sexual phase for adults and juveniles and chelae-length/width relationships were used to interpret patterns in sexual dimorphism. Carapace length (CL)–wet weight (Wwt) relationships for all genders (i.e., male, female, juvenile) and all male forms (form I and II) had positive allometric growth. Male individuals were not significantly heavier than females of the same length. The maximum length and weights of males (35.1 mm CL) were longer and heavier (11.8 g) than the longest female (31.5 mm) weighing 8.3 g. No statistical difference in mean weight was observed; however, this is attributed to the accelerated development of the chelae in sexually mature form I males, whereas chelae of females grow slower throughout life. Chelae length was significantly different between male form II and male form I, and male form II and females (P = 0.004, and P <0.001, respectively). The relatively longer chelae of form I and form II males are due to sexually dimorphic change.

Relaxed attitude towards spreading of alien crayfish species affects protection of native crayfish species: case studies and lessons learnt from a Fennoscandian viewpoint

2020 ◽  
Vol 25 (1) ◽  
pp. 39-46
Author(s):  
Japo Jussila ◽  
Lennart Edsman
Keyword(s):  
Competitive Advantage ◽  
Pacifastacus Leniusculus ◽  
Astacus Astacus ◽  
Signal Crayfish ◽  
Aphanomyces Astaci ◽  
Noble Crayfish ◽  
Native Crayfish ◽  
Chronic Carrier ◽  
Highly Virulent ◽  
Crayfish Species

Abstract The spreading of the alien signal crayfish (Pacifastacus leniusculus) is posing an ongoing threat to native European crayfish species in Fennoscandia, like the native noble crayfish (Astacus astacus). The signal crayfish is commonly a chronic carrier of the crayfish plague (Aphanomyces astaci), thus, in addition to being more competitive than noble crayfish, it also has a competitive advantage in this disease over the noble crayfish. The challenges rising from the introduction of the alien signal crayfish to Sweden, Finland and finally also Norway, are similar in nature. The licensed and unlicensed spreading of this species also has a similar history in these countries. In this paper we describe some of the patters of the spread of alien signal crayfish and highlight the detrimental nature of an alien crayfish, accompanied by a highly virulent disease, to native Fennoscandian crayfish and also to native Fennoscandian ecosystems. A halt to the further spreading of alien signal crayfish in Fennoscandia is the only means to ensure successful conservation outcomes for the noble crayfish.

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

2020 ◽  
Vol 8 ◽  
Author(s):  
Raphael Krieg ◽  
Alex King ◽  
Armin Zenker
Keyword(s):  
Population Density ◽  
Water System ◽  
Predatory Fish ◽  
Success Story ◽  
The Past ◽  
Invasive Crayfish ◽  
Negative Impacts ◽  
Native Crayfish ◽  
Crayfish Species

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.

Influence of an Exotic and a Native Crayfish Species on a Littoral Benthic Community

Oikos ◽  
1999 ◽  
Vol 85 (3) ◽  
pp. 545 ◽  
Author(s):  
Per Nystrom ◽  
Christer Bronmark ◽  
Wilhelm Graneli
Keyword(s):  
Benthic Community ◽  
Native Crayfish ◽  
Crayfish Species

scholarly journals Temporal Changes in Concentrations of Some Trace Elements in Muscle Tissue of Crayfish,Astacus leptodactylus(Eschscholtz, 1823), from Keban Dam Lake

2014 ◽  
Vol 2014 ◽  
pp. 1-4 ◽  
Author(s):  
Onder Aksu ◽  
Ragip Adiguzel ◽  
Veysel Demir ◽  
Numan Yildirim ◽  
Durali Danabas ◽  
...  
Keyword(s):  
Trace Elements ◽  
Environmental Pollution ◽  
Western Europe ◽  
Temporal Trends ◽  
Astacus Leptodactylus ◽  
Muscle Tissues ◽  
Commission Regulation ◽  
Native Crayfish ◽  
Crayfish Species ◽  
Concentration Levels

Crayfish (Astacus leptodactylusEschscholtz, 1823) is the native crayfish species in Turkey. It was exported regularly to Western Europe. In this study, bioaccumulation and temporal trends of some trace elements (arsenic: As, cadmium: Cd, copper: Cu, mercury: Hg, lead: Pb, and zinc: Zn) in edible abdomen muscle of crayfish from Keban Dam Lake (Elazığ, Turkey) were investigated for the 2006–2012 period. Sequence of metal concentration levels was Zn > Cu > Hg > Pb > Cd > As in muscle tissues. The highest concentration of Zn (21.69 mg kg−1) was detected in 2006, while the lowest (4.35 mg kg−1) in 2009. In general, it was found that the concentrations of trace elements investigated were lower than the maximum permissible limits of the food regulations of the Ministry of Food, Agriculture, and Livestock (MFAL), the Turkish Food Codex and Commission Regulation (EC). If the crayfish selected for the study are recognized as bioindicators of environmental pollution, then it is possible to conclude that the changes in studied trace elements concentrations in the Keban Dam Lake are being steady.

scholarly journals The current distribution of the freshwater crayfish (Decapoda: Astacidae, Cambaridae) in the Neman river basin in Belarus

2020 ◽  
Vol 65 (2) ◽  
pp. 182-190
Author(s):  
A. V. Alekhnovich ◽  
D. V. Molotkov ◽  
K. Śliwińska
Keyword(s):  
Invasive Species ◽  
Alien Species ◽  
River Basin ◽  
Current Distribution ◽  
Native Species ◽  
Local Community ◽  
Freshwater Crayfish ◽  
Gravel Pits ◽  
Native Crayfish ◽  
Crayfish Species

The trends in the distribution and occurrence of the freshwater crayfish in the water bodies of the Neman River basin are presents. It has been shown that both native species: the noble and the narrow-clawed crayfish are declined and/or are displaced with rapidly expanding its range the invasive spiny-cheek crayfish. In recent years the alien species was found in isolated gravel pits and lakes, where it could be transferred only by the human activity. These findings confirm the need of the education about the threats posed by the invasive species on the native biodiversity especially with the local community, which is an obligatory practice for protection the native species in the area expanded with non-native crayfish species. Further, to increase the likelihood of the local biodiversity conservation it is highly needed to undertake targeted actions aimed at resettling endangered populations into waterbodies unavailable for the invasive spiny-cheek crayfish expansion.

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