Abstract
Spatial Variations in The Length-Weight Relationship and Relative Condition Factor of The Introduced Freshwater Crayfish, Procambarus clarkii, (Girard, 1852) from the River Nile and Its Tributaries, Egypt
Highlights
The red swamp crayfish, Procambarus clarkii (Girard, 1852), family Cambaridae (Crustacea: Decapoda) considers very common native species that live in many freshwater bodies of the south-central U.S.A., Louisiana (Huner and Avault, 1995)
This study aims to throw light on the biometric relationships of Procambarus clarkii indicating the possibility of exploitation as mass stock proteins resource from this invasive aquatic animal into the Egyptian freshwater habitats
The Length-Weight Relationship: A- Sexes Combined: A total of 693specimens (471 males, 222 females) of P. clarkii were used for studying the relationship between total length (TL) and total body wet weight (W) for the sexes combined population at the four studied sites
Summary
The red swamp crayfish, Procambarus clarkii (Girard, 1852), family Cambaridae (Crustacea: Decapoda) considers very common native species that live in many freshwater bodies of the south-central U.S.A., Louisiana (Huner and Avault, 1995) It invaded other countries including Europe, Australia and China (Huner et al, 1993), and represents at the present times the most common widespread species from over 400 species of freshwater crayfishes belonging to the families Astacidae, Cambaridae and Parastacidae around the world (Huner and Lindqvist, 1995). During the last few years, many studies had made to maximize its use as a source of protein, as live bait, as animal diet, or even as experimental animals in the classroom in order to eliminate a considerable number of its population (Lodge et al, 2000; Ibrahim and Khalil, 2009) This species can tolerate a wide range of water qualities (Ibrahim and Khalil, 2009). It has about 20-25% of its total body weight is edible meat, even other wastes (carapace, viscera and cephalothorax) have high protein sources, and can be used as human food(Zaglol and Eltadawy, 2009; El-Sherif and Abd El-Ghafar, 2015), fish meal (Agouz and Tonsy, 2003), or as food for egg and meat producing poultry (Raafat, 2006)
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