Cookies Policy
X

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies.

I accept this policy

Find out more here

Crayfish (Procambarus Clarkii) Condition Throughout the Year in the Lower Mondego River Valley, Portugal

No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
The full text of this article is not currently available.

Brill’s MyBook program is exclusively available on BrillOnline Books and Journals. Students and scholars affiliated with an institution that has purchased a Brill E-Book on the BrillOnline platform automatically have access to the MyBook option for the title(s) acquired by the Library. Brill MyBook is a print-on-demand paperback copy which is sold at a favorably uniform low price.

Access this article

+ Tax (if applicable)
Add to Favorites
You must be logged in to use this functionality

image of Crustaceana

A study was performed to document the seasonality of crayfish (Procambarus clarkii) condition in the lower Mondego River valley, relating it to sex and to reproductive state. Two sampling programs were carried out, and Fulton's condition factor was determined for individual crayfish. The first sampling program was performed from June 1992 to January 1993 and the second from May 1993 to September 1994. Twenty-five baited traps were set overnight, spaced 5 m apart. In 1992-93 a total of 337 crayfish were captured, average post orbital carapace length (POCL) 3.19 cm, average weight 17.18 g and average condition factor 0.49. In 1993-94, 2149 crayfish were captured, average POCL 2.94 cm, average weight 15.39 g and average condition factor 0.54. Reproductively active (Form I) males were abundant from May to October. The average condition factor was dependent on sex and reproductive state, but the seasonal pattern of variation was similar for females, for all males, for reproductive males (Form I) and for non-reproductive males (Form II). Form II males had the lowest average condition factor. Form I males had the highest average condition factor. From December to May there was a gradual decrease in condition, ending as a steep decrease. This may be explained by a mass moulting to reproductive forms. A postreproductive decrease in condition was observed in September and October. Our data corroborate the idea that there is a relation between male condition and reproductive activity.

Affiliations: 1: ) IMAR, Department of Ecology, University of Évora, Apartado 94, P-7001 Évora codex, Portugal; 2: ) IMAR, Department of Zoology, University of Coimbra, P-3000 Coimbra, Portugal

Loading

Full text loading...

/content/journals/10.1163/156854098x00590
Loading

Data & Media loading...

http://brill.metastore.ingenta.com/content/journals/10.1163/156854098x00590
Loading

Article metrics loading...

/content/journals/10.1163/156854098x00590
1998-01-01
2016-12-07

Sign-in

Can't access your account?
  • Tools

  • Add to Favorites
  • Printable version
  • Email this page
  • Subscribe to ToC alert
  • Get permissions
  • Recommend to your library

    You must fill out fields marked with: *

    Librarian details
    Your details
    Why are you recommending this title?
    Select reason:
     
    Crustaceana — Recommend this title to your library
  • Export citations
  • Key

  • Full access
  • Open Access
  • Partial/No accessInformation