scholarly journals Population Dynamics of the Freshwater Crayfish Procambarus Clarkii ( Girard , 1852 ) in the River Nile , Egypt

2015 ◽  
Vol 19 (2) ◽  
pp. 101-116 ◽  
Author(s):  
Abd El-Halim A. Saad ◽  
Sahar F. Mehanna ◽  
Magdy T. Khalil
Keyword(s):  
Population Dynamics ◽  
Procambarus Clarkii ◽  
Freshwater Crayfish ◽  
River Nile

Population dynamics of the freshwater crayfish Procambarus clarkii (Girard,1852) in the River Nile, Egypt

2015 ◽  
Vol 19 (2) ◽  
pp. 101-116
Author(s):  
Abd El-Halim Saad ◽  
Sahar Mehanna ◽  
Magdy Khalil ◽  
Mohamed Said
Keyword(s):  
Population Dynamics ◽  
Procambarus Clarkii ◽  
Freshwater Crayfish ◽  
River Nile

Iinfectious hypodermal and haematopoietic necrosis virus (IHHNV) infection in freshwater crayfish Procambarus clarkii

Aquaculture ◽  
2017 ◽  
Vol 477 ◽  
pp. 76-79 ◽  
Author(s):  
Bo-Kun Chen ◽  
Zhen Dong ◽  
Da-Peng Liu ◽  
Yong-Bin Yan ◽  
Neng-Yuan Pang ◽  
...  
Keyword(s):  
Procambarus Clarkii ◽  
Freshwater Crayfish ◽  
Necrosis Virus

scholarly journals Predicting harvest of non-native signal crayfish in lakes — a role for changing climate?

2016 ◽  
Vol 73 (5) ◽  
pp. 785-792 ◽  
Author(s):  
Patrik Bohman ◽  
Lennart Edsman ◽  
Alfred Sandström ◽  
Per Nyström ◽  
Marika Stenberg ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Water Temperature ◽  
Temperature Data ◽  
Adult Survival ◽  
Winter Mortality ◽  
Freshwater Crayfish ◽  
Catch Per Unit Effort ◽  
Signal Crayfish ◽  
Cool Water ◽  
Air Temperatures

The signal crayfish (Pacifastacus leniusculus) was introduced to Sweden in 1960, and it has a high commercial and recreational value, but it may also have negative effects on native ecosystems. To better predict how climate warming will affect population dynamics of this cool-water crayfish, we explored the role of temperature and density dependence as explanatory factors of the subsequent years’ catch rates of commercially sized signal crayfish in four Swedish lakes. We found air temperatures to be good proxies for water temperatures in all lakes, except during winter. We could only obtain water temperature data for Lake Vättern, and winter temperature data were therefore only included in the analysis of catch-per-unit-effort patterns in this lake. Our results indicate that increasing mean air temperatures will potentially affect the population dynamics of cool-water freshwater crayfish species such as the signal crayfish. Based on data from four lakes, it seems that the population dynamics of signal crayfish are lake-specific and could be affected by either recruitment during the juvenile stage, the survival and growth of adults, or both. Increased fluctuations in water temperature during winter may potentially influence adult survival. To better predict the effects of global warming on the dynamics of cool-water crayfish populations, we suggest that future studies should investigate recruitment in crayfish along temperature gradients and the influence of variations in water temperature on winter mortality.

Characterization of Oscillatory Olfactory Interneurones in the Protocerebrum of the Crayfish

1992 ◽  
Vol 167 (1) ◽  
pp. 15-38
Author(s):  
DEFOREST MELLON ◽  
DAVID C. SANDEMAN ◽  
RENATE E. SANDEMAN
Keyword(s):  
Procambarus Clarkii ◽  
Lucifer Yellow ◽  
Freshwater Crayfish ◽  
University Of Virginia ◽  
Olfactory Pathway ◽  
Electrophysiological Recordings ◽  
Burst Period ◽  
Electron Microscopical ◽  
The Brain

1. We obtained intracellular electrophysiological recordings from local interneurones within the hemi-ellipsoid neuropile of the brain in the freshwater crayfish Cherax destructor and Procambarus clarkii. The recordings were made from perfused, isolated head preparations that provided several indications of a healthy physiological condition. 2. The hemi-ellipsoid interneurones are spontaneously active, generating bursts of action potentials at regular intervals. The inter-burst period differs among neurones, varying from about 1.0 s at the shortest periods to around 30 s for the longest periods. 3. Evidence from both electrophysiological recordings and from injection of Lucifer Yellow and Neurobiotin dyes into hemi-ellipsoid interneurones suggests that some of the cells in the populations are electrically coupled to one another. 4. Hemi-ellipsoid interneurones are driven postsynaptically by axons within the lateral protocerebral tract. Experiments with focal electrical stimulation strongly suggest that the pathways responsible include axons of the olfactory-globular tract. These findings support our previous electron microscopical data showing that olfactory-globular tract axons are presynaptic to the hemi-ellipsoid interneurones. 5. These findings support the conclusion that hemi-ellipsoid interneurones are an integral link in the central olfactory pathway of the crayfish. Note: Present address and address for reprint requests: Department of Biology, Gilmer Hall, University of Virginia, Charlottesville, VA 22901, USA.

Cadmium-induced oxidative stress, histopathology, and transcriptome changes in the hepatopancreas of freshwater crayfish (Procambarus clarkii)

2019 ◽  
Vol 666 ◽  
pp. 944-955 ◽  
Author(s):  
Yu Zhang ◽  
Zheyu Li ◽  
Sergey Kholodkevich ◽  
Andrey Sharov ◽  
Yujie Feng ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Procambarus Clarkii ◽  
Freshwater Crayfish
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