Results 171 to 180 of about 4,874 (208)

Associations and basis of personality, life-history and social interactions [PDF]

Niemelä, Petri
core  

Noble Crayfish Are More Sensitive to Terbuthylazine than Parthenogenetic Marbled Crayfish [PDF]

Water, Air, and Soil Pollution, 2020
AbstractWe investigated the sensitivity of two freshwater crayfish species (Astacus astacus and Procambarus virginalis) during embryonic development to chronic exposure to the herbicide terbuthylazine under laboratory conditions. The assessed parameters included time of embryonic development, survival rate, hatching weight and histopathology of ...
Jan Laurenz, Kai Lehmann, Arne Georg
exaly   +2 more sources

Timing and quantifying Aphanomyces astaci sporulation from the noble crayfish suffering from the crayfish plague

Veterinary Microbiology, 2013
Aphanomyces astaci sporulation is crucial for the spreading potential of this disease agent. For the first time, we are reporting timing and quantity of A. astaci spores released from noble crayfish (Astacus astacus) suffering from crayfish plague under practical aquatic conditions. We infected nine noble crayfish with A.
Trude Vrålstad
exaly   +3 more sources

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

Aquaculture, 1996
Abstract As part of investigations of the ecological impact and transmission of the crayfish parasite Psorospermium haeckeli , a laboratory experiment was performed where noble crayfish, Astacus astacus , and signal crayfish, Pacifastacus leniusculus , from populations in which P.
exaly   +2 more sources

Characterisation of the noble crayfish immune response to the crayfish plague disease agent and its analogues

CrayfIT - Book of Abstracts, 2023
Recent findings point to the existence of immune memory in invertebrates. Some species show an improved immune response to pathogen challenge after previous nonlethal exposures to the pathogen or its analogues. This mechanism, although little studied in freshwater crayfish, could have significant applications in aquaculture.
Hudina, Sandra, Tarandek, Anita
openaire  

Latent crayfish plague (Aphanomyces astaci) infection in a robust wild noble crayfish (Astacus astacus) population

Aquaculture, 2011
article i nfo Apparently healthy wild noble crayfish (Astacus astacus) sampled from Lake Mikitanjarvi, Kainuu, Finland in 2009 and 2010 were discovered to be PCR-positive for Aphanomyces astaci. Detection prevalence was lower in 2009 than in 2010. Despite the detected sublethal infection, the Lake Mikitanjarvi population has been pro- ductive and is ...
Anssi Vainikka, Raine K Kortet
exaly   +2 more sources

Predation on larvae of the noble crayfish, Astacus astacus L.

Aquaculture, 1990
Abstract The predation by dragonfly larvae ( Aeschna grandis ) and adult female crayfish on second-stage young of the noble crayfish, Astacus astacus , was studied in aquarium experiments. Combinations of crayfish young with and without adult female crayfish, with and without shelter were made in 4×4 set-ups with dragonfly larvae and 4×2 without ...
Rolf Gydemo, Lars Westin, Anders Nissling   +2 more
openaire   +1 more source

The study of bacteria on artificially incubated noble crayfish eggs

Inland Water Biology, 2011
Data on the abundance of heterotrophic bacteria on the surface of artificially incubated noble crayfish (Astacus astacus L.) eggs are presented. The highest abundance of heterotrophic bacteria was observed on crayfish juveniles (stage 1). The abundance of bacteria in the water of the incubator’s system was found to be considerably lower than that on ...
L. Mickėnienė, J. Šyvokienė
openaire   +1 more source

Noble crayfish and narrow-clawed crayfish hybridisation experiment in natural habitat

2013
Mixed populations of noble (Astacus astacus) and narrow-clawed crayfish (Astacus leptodactylus) can be found across Europe, but the existence of their hybrids has not yet been confirmed. Up till now, hybrids between the two species were obtained in laboratory conditions, however juveniles did not survive.
Jelić, Mišel, Klobučar, Goran, Bláha, Martin, Maguire, Ivana   +3 more
openaire   +2 more sources

Dose-dependent mortality of the noble crayfish (Astacus astacus) to different strains of the crayfish plague (Aphanomyces astaci)

Journal of Invertebrate Pathology, 2014
Several reports of the European crayfish species carrying a latent infection of the crayfish plague (Aphanomyces astaci) have emerged and the discussion has focused especially on the lowered virulence of As-genotypes behind decreased mortality. The aim of this study was to compare the killing rate of different A.
Vainikka Anssi, Kokko Harri Ilkka, Jussila Japo, Makkonen Jenny Irmeli, Kortet Raine   +4 more
openaire   +2 more sources