Results 131 to 140 of about 565 (161)

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.
Japo Jussila, Anssi Vainikka, Jenny Makkonen   +2 more
exaly   +3 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 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

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

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

Development and characterization of novel tetranucleotide microsatellite markers in the noble crayfish (Astacus astacus) suitable for highly multiplexing and for detecting hybrids between the noble crayfish and narrow-clawed crayfish (A. leptodactylus)

Aquaculture, 2017
Abstract 48 novel tetranucleotide microsatellite loci were developed for the noble crayfish ( Astacus astacus ) using Illumina MiSeq next generation sequencing technology. It was demonstrated that 25 loci were polymorphic and 19 loci could be co-amplified in a single multiplex polymerase chain reaction (PCR) assay and genotyped as a single panel on ...
Riho Gross, Kuldar Kõiv, Lilian Pukk, Katrin Kaldre   +3 more
openaire   +1 more source

Ultrastructure of egg activation and cortical reaction in the noble crayfish Astacus astacus

Micron, 2015
Morphological changes in the gamete of female noble crayfish at four developmental stages were studied. Mature ovarian oocytes are enclosed by the first envelope that consists of two layers. Numerous pores are visible on the surface of the outer layer of this envelope and the inner layer contains bottlebrush-shaped objects.
Hamid, Niksirat, Antonín, Kouba, Pavel, Kozák   +2 more
openaire   +2 more sources

Egg development and lifecycle timing in the noble crayfish (Astacus astacus)

Aquaculture, 1987
Abstract Egg development time in Astacus astacus was strongly influenced by temperature. Five batches of eggs were subjected to different temperature regimes after approximately 600 degree days and, by increasing the temperature, the total number of degree days to hatching was reduced from 1900 to 1300.
Dag O. Hessen, Trond Taugbøl, Eirik Fjeld, Jostein Skurdal   +3 more
openaire   +1 more source

Distribution and epidemiology of genotypes of the crayfish plague agent Aphanomyces astaci from noble crayfish Astacus astacus in Finland

Diseases of Aquatic Organisms, 2013
The crayfish plague agent Aphanomyces astaci was isolated from 69 noble crayfish Astacus astacus samples in Finland between 1996 and 2006. All isolates were genotyped using randomly amplified polymorphic DNA-polymerase chain reaction (RAPD-PCR).
Viljamaa-Dirks, S., Heinikainen, S., Torssonen, H., Pursiainen, M., Mattila, J., Pelkonen, S.   +5 more
exaly   +3 more sources