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

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.

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Signal crayfish, Pacifastacus leniusculus, as a vector for Psorospermium haeckeli to noble crayfish, Astacus astacus

Aquaculture ◽

10.1016/s0044-8486(96)01400-7 ◽

1996 ◽

Vol 148 (1) ◽

pp. 1-9 ◽

Cited By ~ 7

Author(s):

Rolf Gydemo

Keyword(s):

Pacifastacus Leniusculus ◽

Astacus Astacus ◽

Signal Crayfish ◽

Noble Crayfish

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Fluctuations in harvest of native and introduced crayfish are driven by temperature and population density in previous years

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f09-170 ◽

2010 ◽

Vol 67 (1) ◽

pp. 157-164 ◽

Cited By ~ 10

Author(s):

Karin Olsson ◽

Wilhelm Granéli ◽

Jörgen Ripa ◽

Per Nyström

Keyword(s):

Time Lag ◽

Mating Season ◽

Astacus Astacus ◽

Growth Season ◽

Signal Crayfish ◽

Noble Crayfish ◽

Crayfish Population ◽

Effects Of Temperature ◽

Parsimonious Model ◽

Large Adult

The effects of temperature and density on annual fluctuations in catches of large adult crayfish are evaluated using time series analysis. We tested if temperature during different stages of the crayfish life cycle influenced observed catches from 1946 to 2007 in Lake Bunn (Sweden). From 1946 to 1974, native noble crayfish ( Astacus astacus ) inhabited the lake, but then, crayfish plague wiped out the whole population. In 1985, the exotic signal crayfish ( Pacifastacus leniusculus ) was introduced and is still present. This made it possible to model the two species separately and compare how temperature and density influence the abundance of large adult crayfish. The best models indicate that both climatic- and density-dependent factors influence the observed fluctuations and there was a time lag for most factors included in the best models. Winter temperature had the strongest influence on fluctuations of both species. Also, density dependence was included in the best model for both species. Growth season for noble crayfish and temperature during the mating season for signal crayfish were also present in the most parsimonious model. Based on our findings, it is difficult to predict how further climate warming will affect crayfish population dynamics in freshwaters.

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

Freshwater Crayfish ◽

10.5869/fc.2020.v25-1.039 ◽

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.

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Chronic crayfish plague infection and eroded swimmeret syndrome in Lake Saimaa (Finland) signal crayfish

Freshwater Crayfish ◽

10.5869/fc.2017.v23-1.23 ◽

2017 ◽

Vol 23 (1) ◽

pp. 23-28

Author(s):

Japo Jussila ◽

Vese Tiitinen ◽

Lennart Edsman

Keyword(s):

Chronic Infection ◽

Reproductive Output ◽

Catch Per Unit Effort ◽

Egg Hatching ◽

Signal Crayfish ◽

Aphanomyces Astaci ◽

Unit Effort ◽

History Of ◽

Crayfish Population ◽

Lake Saimaa

Abstract We present data and results from a 9-year survey (2009 – 2017) of the Lake Saimaa signal crayfish population in Finland. This population has a history of chronic infection with Aphanomyces astaci. It has now been discovered that female signal crayfish from Lake Saimaa suffer from various stages of eroded swimmeret syndrome (ESS), and male crayfish also show symptoms of ESS-like trauma (i.e., eroded swimmerets and gonopods). Our data demonstrates the prevalence of A. astaci infection, with gross symptoms prevailing throughout the duration of the entire 2009 – 2017 survey, and that prevalence of ESS among female signal crayfish is correlated with the prevalence of A. astaci infection in the population. The data shows that an increasing proportion of female crayfish suffer from ESS, and have regenerated swimmerets, however, our observations indicate that partially regenerated swimmerets do not fully function during egg hatching. Based on data and observations during the survey, we speculate that low production levels, as indicated by the low catch per unit effort (CPUE), within the Lake Saimaa signal crayfish population could be related to both high A. astaci infection levels and ESS prevalence among females. The former could be causing increasing mortality among adult crayfish and the latter could be lowering Lake Saimaa signal crayfish reproductive output.

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Survival and growth of catfish Pangasionodon sp. larvae fed on vitamin C-enriched Artemia

Jurnal Akuakultur Indonesia ◽

10.19027/jai.12.136-143 ◽

2015 ◽

Vol 12 (2) ◽

pp. 136

Author(s):

Mia Setiawati ◽

Darina Putri ◽

Dedi Jusadi

Keyword(s):

Body Weight ◽

Vitamin C ◽

Body Length ◽

Culture Medium ◽

Total Body Length ◽

Feeding Experiment ◽

Survival And Growth ◽

Total Body ◽

Average Body ◽

Average Body Weight

ABSTRACT The research was conducted to evaluate effect of the administration of Artemia enriched with vitamin C on the survival, total body length, and average body weight of Pangasionodon sp. larvae. Artemia were enriched with either 0, 50, 100, or 150 mg/L vitamin C immersed in the culture medium for 13 hours. Two days old larvae were fed on enriched Artemia 12 times/day for seven days. At the end of feeding experiment, it was found that fish fed on Artemia enriched with 100 mg/L culture medium had the highest survival, total length and body weight, respectively 76.17±12.78%, 1.63±0.34 cm, and 20.6±3.8 mg. Keywords: survival, growth, Artemia, vitamin C, catfish, Pangasionodon sp. ABSTRAK Penelitian ini dilakukan untuk mengetahui pengaruh Artemia yang diperkaya dengan vitamin C dosis berbeda terhadap kelangsungan hidup, panjang total, dan bobot tubuh larva ikan patin Pangasionodon sp. Pada penelitian ini, Artemia diperkaya dengan vitamin C dosis 0, 50, 100, atau 150 mg/L media pengayaan. Larva yang berumur dua hari diberi pakan Artemia hasil pengayaan sebanyak 12 kali sehari selama tujuh hari masa pemeliharaan. Pada akhir percobaan, didapatkan bahwa larva ikan yang diberi Artemia diperkaya vitamin C dosis 100 mg/L media pengayaan memberikan kelangsungan hidup 76,17±12,78%, panjang total 1,63±0,34 cm, dan bobot tubuh paling tinggi 20,6±3,8 mg. Kata kunci: kelangsungan hidup, pertumbuhan, Artemia, vitamin C, ikan patin, Pangasionodon sp.

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Signal crayfish in Lake Saimaa could be maladapted to the local conditions due to Aphanomyces astaci infection: A seven-year study

Freshwater Crayfish ◽

10.5869/fc.2016.v22-1.53 ◽

2016 ◽

Vol 22 (1) ◽

pp. 53-60 ◽

Cited By ~ 6

Author(s):

Japo Jussial ◽

Vesa Tiitinen ◽

Lennart Edsman ◽

Harri Kokko ◽

Ravi Fotedar

Keyword(s):

Commercial Fishery ◽

Total Catch ◽

Trap Catch ◽

Local Conditions ◽

Signal Crayfish ◽

Aphanomyces Astaci ◽

Commercial Grade ◽

Noble Crayfish ◽

Crayfish Population ◽

Lake Saimaa

Abstract We conducted a seven-year survey (years 2009 - 2015) of the Lake Saimaa signal crayfish population. Lake Saimaa is the largest single waterbody in Finland, with a productive fishery and crayfishery. The signal crayfish were introduced to Lake Saimaa in mid-1990’s and a commercial fishery was initiated in the mid-2000s. At first, there was a small proportion of noble crayfish among the catch, but after 2007, an acute crayfish plague epidemic eradicated them, and the signal crayfish stock started showing frequent gross symptoms of chronic crayfish plague infection (e.g., melanised lesions, eroded uropods and pleopods, lost appendages with melanised stumps). This stock now shows gross symptoms of the infection at a rate of 45% to 79% of the annual trap catch, in addition to showing signs of eroded swimmeret symdrome (ESS) at a rate of 2.8 to 15.4%. The CPUE has remained rather low, between one and three crayfish throughout the survey, while the proportion of the commercial grade catch has been between 35% and 68% of the total catch. The signal crayfish populations in Lake Saimaa are still rather fragmented, and production is low. It appears that the Lake Saimaa signal crayfish population has developed slowly and is producing less than expected.

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Detection of nobel crayfish Astacus astacus v1

10.17504/protocols.io.bqtrmwm6 ◽

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".

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Detection of signal crayfish Pacifastacus leniusculus v1

10.17504/protocols.io.bqypmxvn ◽

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".

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

Knowledge and Management of Aquatic Ecosystems ◽

10.1051/kmae/2018016 ◽

2018 ◽

pp. 27 ◽

Cited By ~ 3

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.

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