Biocontrol potential of Chitosan extracted from Procambarus clarkii (Crustacea: Cambaridae) against Eobania vermiculata snails (Muller 1774) in Egypt

Disjunct distribution pattern of Procambarus clarkii (Crustacea, Decapoda, Astacida, Cambaridae) in an artificial lake system in Southwestern Germany

Procambarus clarkii is among the worst invasive species that have invaded Europe. It originates from the central south of the USA and northeastern Mexico and is a hardy, r-selected generalist. There exists a marked gradient in population numbers from southwestern to northeastern Europe: The Iberian Peninsula, Italy and France have the bulk of the populations, while northeastern populations are ...

Red Swamp Crayfish (procambarus Clarkii) in River Nile, Egypt

A novel Spiroplasma pathogen causing systemic infection in the crayfish Procambarus clarkii (Crustacea: Decapod), in China.

A novel disease of crayfish Procambarus clarkii appeared in the summer of 2004 in freshwater aquaculture in Jiangsu province of China. Light and transmission electron microscopy (TEM), molecular biological methods and in vitro culture were used to identify the pathogen. The agent was unique in having a helical morphology and rotary motility as observed by phase-contrast light microscopy and was...

Spermiogenesis in the Crayfish (procambarus Clarkii)

The sperm of the crayfish, Procambarus clarkii, is relatively simple among decapod sperm and was described in the first paper of this series (28). The present paper details the development of this sperm as followed with the light and electron microscopes. The process is divided into six stages for purposes of description. The main points of interest discussed are the absence of mitochondria or ...

Onion powder as feed additive in Procambarus clarkii culture

120 days trial was performed to evaluate the effect of dietary onion powder on the growth performance of red swamp crayfish Procambarus clarkii. Crayfish with initial body weight of 1.37±0.13 g were randomly stocked to experimental tanks. Four different onion powder levels in ratios of 10, 20, 30, and 40 g/kg were added to the formulated experimental basal feed and a control group was fed with ...