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201694

Spatial Variations in The Length-Weight Relationship and Relative Condition Factor of The Introduced Freshwater Crayfish, Procambarus clarkii, (Girard, 1852) from the River Nile

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Last updated: 03 Jan 2025

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Abstract

The biometric relationships for the freshwater crayfish, Procambarus clarkii (Girard, 1852) collected from four different sites of the River Nile and its tributaries (Helwan, El Warraq, El Rahawy and El Rayah El Menoufy) had calculated during the present study. The size of these individuals varied from 6.6 to 14.3 cm in total length, and from 3.6 to 80.8 g in total body weight. There was an obvious gradual increase in average weight, varied from 26.81 ±14.47g at Helwan to 27.46±18.6 g and, 27.52 ±17.22 g at El Warraq and El Rayah El Mounofy, respectively, reaching the highest average of 34.48±22.5 g at El Rahawy. The relationship < /span> between the total length and total body weight for the whole population (sexes combined) showed curvilinear relation at all sites, with positive allometric regression coefficient "b" higher than an isometric value ‘3", recorded 3.169, 3.301 and 3.228 at Helwan, El Warraq and El Rahawy, respectively, but declined to negative allometry of 2.576 at El Rayah El Mounofy. The values of “b" were also higher in males than females at all between sexes (P> 0.05). The values of relative condition factor "Kn" (wellbeing) for this species was generally higher than ‘1" at most sites and averaged 1.14 ± 0.20, 0.96± 0.18, 1.12± 0.14 and 1.11+0.27 at Helwan, El Warraq, El Rahawy and El Rayah El Mounofy, respectively. It was also relatively higher in small and medium-sized individuals than the larger sizes.

DOI

10.21608/eajbsz.2021.201694

Keywords

Egypt, River Nile, Crayfish, total length, body weight, Condition factor

Authors

First Name

Eman,

Last Name

Shaaban

MiddleName

A.

Affiliation

National Institute of and Oceanography and Fisheries, Al Kanater.

Email

e.a_ahmed@yahoo.com

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First Name

Awaad,

Last Name

El-Sayed

MiddleName

A. M.

Affiliation

Faculty of Science (Boys), Al-AzharUniversity, Cairo, Egypt

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Orcid

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First Name

Faten

Last Name

El Feky

MiddleName

-

Affiliation

Faculty of Science (Girls), Al-Azhar University, Cairo, Egypt.

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First Name

Soad,

Last Name

Abdel Gawad

MiddleName

Mohammed

Affiliation

National Institute of and Oceanography and Fisheries, Al Kanater

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Orcid

-

First Name

Neveen

Last Name

Mohammed

MiddleName

H.

Affiliation

Faculty of Science (Girls), Al-Azhar University, Cairo, Egypt.

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Volume

13

Article Issue

2

Related Issue

26137

Issue Date

2021-12-01

Receive Date

2021-08-12

Publish Date

2021-12-01

Page Start

135

Page End

146

Print ISSN

2090-0759

Online ISSN

2090-0821

Article File

EAJBSZ_Volume 13_Issue 2_Pages 135-146.pdf

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Link

https://eajbsz.journals.ekb.eg/article_201694.html

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https://eajbsz.journals.ekb.eg/service?article_code=201694

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12

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Original Article

Type Code

672

Publication Type

Journal

Publication Title

Egyptian Academic Journal of Biological Sciences, B. Zoology

Publication Link

https://eajbsz.journals.ekb.eg/

MainTitle

Spatial Variations in The Length-Weight Relationship and Relative Condition Factor of The Introduced Freshwater Crayfish, Procambarus clarkii, (Girard, 1852) from the River Nile

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Article

Created At

22 Jan 2023