scholarly journals Introduced alien signal crayfish (Pacifastacus leniusculus) in Finland − uncontrollable expansion despite numerous crayfisheries strategies

2018 ◽  
pp. 27 ◽  
Author(s):  
Timo J. Ruokonen ◽  
Rosanna Sjövik ◽  
Esa Erkamo ◽  
Jouni Tulonen ◽  
Fabio Ercoli ◽  
...  
Keyword(s):  
Alien Species ◽  
Current Distribution ◽  
Management Strategies ◽  
Pacifastacus Leniusculus ◽  
Water Bodies ◽  
Distribution Area ◽  
Limited Effect ◽  
Signal Crayfish ◽  
Noble Crayfish ◽  
Present Distribution

In Finland, massive signal crayfish introductions started towards the end of 1980s, with an estimated total of 2.2 million signal crayfish been stocked before year 2016. During that period, Finnish fisheries authorities have implemented three national management strategies setting guidelines for the crayfish introductions. The main aims of the strategies have been conservation of native noble crayfish stocks and a controlled spreading of the alien signal crayfish within a designated region. In this study, we report the current distribution of signal crayfish in Finland in comparison to the guidelines set in these three national strategies. The present distribution area of the signal crayfish covers most of the Southern Finland. The signal crayfish has been introduced with a stocking permits to over 480 water bodies. In addition, there have been numerous stockings without permits, which are often next to the region designated for the signal crayfish. Based on the results, we conclude that crayfish management strategies adopted in Finland have only had limited effect on the spread of signal crayfish. We presume that main causes for the uncontrolled spreading of the signal crayfish in Finland have been lack of strict official supervision and general lack of awareness about the risks associated with the alien species spreading.

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 Lake Hańcza – a new site for signal crayfish (Pacifastacus leniusculus Dana) occurrence in Poland

2018 ◽  
Vol 26 (2) ◽  
pp. 141-147
Author(s):  
Dariusz Ulikowski ◽  
Łucjan Chybowski
Keyword(s):  
Total Body Length ◽  
Pacifastacus Leniusculus ◽  
Catch Per Unit Effort ◽  
Large Signal ◽  
Signal Crayfish ◽  
Orconectes Limosus ◽  
Noble Crayfish ◽  
Crayfish Population ◽  
Total Body ◽  
Average Body

Abstract Crayfish catches were conducted using traps in Lake Hańcza, which is the deepest lake in Poland. Two crayfish populations were found to co-exist in the lake: spiny-cheek crayfish (Orconectes limosus Raf.) and signal crayfish (Pacifastacus leniusculus Dana), which is a new species for this lake. Signal crayfish dominated the samples at 98.5% of the specimens caught. The crayfish occurred at depths of 1-10 m. The mean total body length of the male and female signal crayfish (TL) was 99.5 ± 17.8 mm and 96.5 ± 11.7 mm, respectively, while the average body weight (BW) was 38.7 ± 24.9 g and 26.8 ± 9.5, respectively. Chelae were damaged in 4.5% of the individuals. Fishing efficiency (catch per unit effort – CPUE) was 0.96 crayfish trap−1 night−1. Selected characteristics of the population and of individual signal crayfish from Lake Hańcza were compared with those of the two closest neighboring populations of this species in lakes Mauda and Pobłędzie. The confirmed occurrence of the relatively large signal crayfish population in Lake Hańcza excludes this lake as a possible site for native noble crayfish (Astacus astacus L.) restoration.

Detection of nobel crayfish Astacus astacus v1

2020 ◽  
Author(s):  
Omneya Ahmed ◽  
Alexander Eiler
Keyword(s):  
Freshwater Ecosystems ◽  
Pacifastacus Leniusculus ◽  
Indigenous Species ◽  
Astacus Astacus ◽  
Signal Crayfish ◽  
Noble Crayfish ◽  
Non Indigenous Species

Crayfish play important role in freshwater ecosystems. Noble crayfish "Astacus astacus" is threatened by non-indigenous species such as signal crayfish "Pacifastacus leniusculus".

Detection of signal crayfish Pacifastacus leniusculus v1

2020 ◽  
Author(s):  
Omneya Ahmed ◽  
Alexander Eiler ◽  
Mats Töpel
Keyword(s):  
Freshwater Ecosystems ◽  
Pacifastacus Leniusculus ◽  
Indigenous Species ◽  
Astacus Astacus ◽  
Signal Crayfish ◽  
Specific Assay ◽  
Noble Crayfish ◽  
Species Specific ◽  
Non Indigenous Species

A species-specific assay was developed and tested by Agersnap et al. (2017) Crayfish play important role in freshwater ecosystems. Noble crayfish "Astacus astacus" is threatened to extinct by non-indigenous species such as signal crayfish "Pacifastacus leniusculus".

Modulation of endogenous antioxidants by zinc and copper in signal crayfish (Pacifastacus leniusculus)

Chemosphere ◽  
2021 ◽  
pp. 129982
Author(s):  
Mark P. Gunderson ◽  
Hailey M. Boyd ◽  
Courtney I. Kelly ◽  
Isabela R. Lete ◽  
Quinlan R. McLaughlin
Keyword(s):  
Pacifastacus Leniusculus ◽  
Signal Crayfish ◽  
Endogenous Antioxidants

scholarly journals How Effective Are Existing Phosphorus Management Strategies in Mitigating Surface Water Quality Problems in the U.S.?

2021 ◽  
Vol 13 (12) ◽  
pp. 6565
Author(s):  
Shama E. Haque
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
Management Strategies ◽  
Surface Water Quality ◽  
Land Application ◽  
Water Soluble ◽  
Phosphorus Recovery ◽  
Water Bodies ◽  
The Past ◽  
The U.S

Phosphorus is an essential component of modern agriculture. Long-term land application of phosphorous-enriched fertilizers and animal manure leads to phosphorus accumulation in soil that may become susceptible to mobilization via erosion, surface runoff and subsurface leaching. Globally, highly water-soluble phosphorus fertilizers used in agriculture have contributed to eutrophication and hypoxia in surface waters. This paper provides an overview of the literature relevant to the advances in phosphorous management strategies and surface water quality problems in the U.S. Over the past several decades, significant advances have been made to control phosphorus discharge into surface water bodies of the U.S. However, the current use of phosphorus remains inefficient at various stages of its life cycle, and phosphorus continues to remain a widespread problem in many water bodies, including the Gulf of Mexico and Lake Erie. In particular, the Midwestern Corn Belt region of the U.S. is a hotspot of phosphorous fertilization that has resulted in a net positive soil phosphorous balance. The runoff of phosphorous has resulted in dense blooms of toxic, odor-causing phytoplankton that deteriorate water quality. In the past, considerable attention was focused on improving the water quality of freshwater bodies and estuaries by reducing inputs of phosphorus alone. However, new research suggests that strategies controlling the two main nutrients, phosphorus and nitrogen, are more effective in the management of eutrophication. There is no specific solution to solving phosphorus pollution of water resources; however, sustainable management of phosphorus requires an integrated approach combining at least a reduction in consumption levels, source management, more specific regime-based nutrient criteria, routine soil fertility evaluation and recommendations, transport management, as well as the development of extensive phosphorus recovery and recycling programs.

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