Issue Cover image

You need to login to your IAA account in order to access jounral PDFs.
Member Login
logo

Freshwater Crayfish 12(1): 946-947 (1999)

PEER REVIEWED    SHORT COMMUNICATION - ABSTRACT ONLY

Download: PDF (689 KB)

Biological peculiarities of the freshwater crayfish Astacus leptodactylus leptodactylus Eschscholtz in the Volgo-Caspian region

Sokolsky A, Mikouiza A-S and Kalmikov E  e-mail link

Published Online:

Abstract

In the delta of the River Volga there are two subspecies of Astacus leptodactylus: A. l. eichwaldi Bott, and A. l. leptodactylus Eschscholtz. Biometric analysis of the latter crayfish shows an average length of 117.18 ± 2.44 mm. The length of the rostrum is 16.43 ± 0.29 mm. The length and width of the upper part and the length of the abdomen and appendage is 31.68 ± 0.74, 63.09 ± 1.37, 19.68 ± 0.38 and 15.34 ± 0.35 mm, respectively. Comparing our data with the results of research carried out by Rumiantsev (1974) we can conclude that the morphometric characteristics of our freshwater crayfish has not changed in the last 20 years. Analysis of the relationship between the length (Y, cm) and weight of the body (X, gr) of female crayfish allowed us to establish an equation between these parameters: Y = A + Bx + Cx, where A = 5.79, B = 0.19 and C = - 0.0015. The coefficient of correlation between the above mentioned parameters is equal to 0.89. For male freshwater crayfish a relation between length and weight was not found. Growth of young crayfish during the first year in the delta of the River Volga is relatively rapid. At the end of August 2 months-old male crayfish have attained lengths up to 43 mm and weights up to 2.42 g and females have attained lengths up to 44 mm and weights of 2.5 g. At the end of August of the third year males have reached a length of 110.0 mm and a weight of 46.71 g and females of 9.18 mm and 34.55 g. The spectrum of feed of young crayfish under natural conditions is wide. In quantity Ostracoda (48%), Chironomidae (29%) and Trichoptera (7%) dominate. The main feeding periods are at 10-11 pm and 6-8 am. The distribution of crayfish in the delta is not homogeneous. The biggest stock is found in the Volga-Akhtubinsk region with approximately 50-70 tons, another habitat is on the western flat-type water reservoirs with 30-50 tons. In the estuary zone of the delta where there is no catching the stock is more than 70-110 tons. In the entire Astrakhan region there is the possibility to catch 40 tons/year. However due to poor organization of catching not even a catch of 20 tons is reached.

Supplemental Documents

  • There are no supplementary documents for this article

CrossRef Logo

Cited By

Citations:

How to Cite

Sokolsky A, Mikouiza A-S and Kalmikov E. (1999). Biological peculiarities of the freshwater crayfish Astacus leptodactylus leptodactylus Eschscholtz in the Volgo-Caspian region. Freshwater Crayfish 12(1):946-947. doi:

 

 

Author Information

Authorship information for this paper are currently unavailable.

 

Publication History

   Manuscript Submitted:

   Manuscript Accepted:

   Published Online:

   Published in Print:

 

 

Funding Information

No specific funding statement is available for this article.

 

 



 

 

 

Member Login

Forgot Your Password?

Recover PW

Enter the e-mail address you used to
create your IAA account.
Return to Login
Back to Top