Age and growth estimates of thornback ray, Raja clavata (Linnaeus, 1758) in Western Algerian coast (Chondrichthyes, Rajidae)

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Age and growth estimates of thornback ray, Raja clavata (Linnaeus, 1758) in Western Algerian coast (Chondrichthyes, Rajidae)

Malika Adda-hanifi, Ali Kherraz, Salim Mouffok, Zitouni Boutiba
Int. J. Biosci.10( 6), 55-68, June 2017.
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Skates (order Rajiformes) are the most diverse group of Chondrichthyan fishes, due to their high diversity, and global distribution, our knowledge of skate biology and ecology remains limited. The objective of the present study was to assess the population dynamics of Raja clavata, particularly to provide the relationships between morphometric and biometric characters, then to investigate age and growth. For this propose, Thornback ray were investigated using 563 specimens, females made up 59.85% and males 40.14%. Weight-Lengths Relationships (WLRs) described by the relative growth, were determined according to the allometric equation revealed the following results:  Weight-total length, WT =0.003 LT3.16 , WT =0.004 LT3.10  and Weight-disc width; WT=0.012 DW3.13 , WT=0.007 DW3.28  , therefore parameters relationships between length-disc width evaluated by linear equation were ; DW = 0.662 LT + 0.41, DW = 0.634 LT + 2.94 respectively for females and males. The parameters of the Von Bertalanffy growth equation obtained using the software LFDA (subroutine ELEFAN)for females were; L =105 cm, k = 0.46, t0 =- 0.20, for males; L =100, k = 0.35, t0=- 0.68.This research will provide a starting point for the development of a management plan and stock assessment of Raja clavata carried in Algerian coast, and results obtained are important input data to better understanding its role in marine ecosystem.


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