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Some Biological Aspects of Thornback Ray (Raja clavata L., 1758) in the Southeastern Black Sea

Year 2005, Volume: 5 Issue: 2, - , 01.04.2005

Sefa Ayhan Demirhan *(1) Semih Engin (2) Kadir Seyhan (3) Erhan Akamca (4)

Abstract

Feeding, reproduction and growth of thornback ray (Raja clavata L., 1758) were studied from the South-eastern Black Sea near the Georgian border. Females made up 56% and males 44% of the individuals. The total length (TL) of females ranged from 34.3 to 88.2 cm (21.5-62.7 cm disc width (DW)), and males from 48.0 to 95.0 cm (35.5-61.0 cm DW)). The total length-weight (TL-W), disc width-weight (DW-W) and total length-disc width (TL-DW) relationships were W=0.001TL3.42 (r2=0.91), W=0.008DW3.21 (r2=0.94) and DW=0.65TL+2.47 (r2=0.88), respectively, for the sexes combined. The total length at 50% maturity (TL50) was about 64.03 cm (44.24 cm DW) for males and about 66.72 cm (47.27 cm DW) for females. Out of 50 stomachs examined, 70% of them were empty. The prey items found in the stomachs were anchovy (Engraulis encrasicolus), horse mackerel (Trachurus trachurus), whiting (Merlangus merlangus euxinus), goby (Gobius sp.), shrimps (Upogobia pusilla, Crangon crangon) and unidentified crab.

Keywords

Thornback ray Raja clavata Black Sea food maturation

Some Biological Aspects of Thornback Ray (Raja clavata L., 1758) in the Southeastern Black Sea

Year 2005, Volume: 5 Issue: 2, - , 01.04.2005

Sefa Ayhan Demirhan *(1) Semih Engin (2) Kadir Seyhan (3) Erhan Akamca (4)

Abstract

Feeding, reproduction and growth of thornback ray (Raja clavata L., 1758) were studied from the South-eastern Black Sea near the Georgian border. Females made up 56% and males 44% of the individuals. The total length (TL) of females ranged from 34.3 to 88.2 cm (21.5-62.7 cm disc width (DW)), and males from 48.0 to 95.0 cm (35.5-61.0 cm DW)). The total length-weight (TL-W), disc width-weight (DW-W) and total length-disc width (TL-DW) relationships were W=0.001TL3.42 (r2=0.91), W=0.008DW3.21 (r2=0.94) and DW=0.65TL+2.47 (r2=0.88), respectively, for the sexes combined. The total length at 50% maturity (TL50) was about 64.03 cm (44.24 cm DW) for males and about 66.72 cm (47.27 cm DW) for females. Out of 50 stomachs examined, 70% of them were empty. The prey items found in the stomachs were anchovy (Engraulis encrasicolus), horse mackerel (Trachurus trachurus), whiting (Merlangus merlangus euxinus), goby (Gobius sp.), shrimps (Upogobia pusilla, Crangon crangon) and unidentified crab.

Keywords

Thornback ray Raja clavata Black Sea food maturation

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Details

Primary Language Turkish
Journal Section Articles
Authors

Sefa Ayhan Demirhan *(1) This is me

Semih Engin (2) This is me

Kadir Seyhan (3) This is me

Erhan Akamca (4) This is me

Publication Date April 1, 2005
Published in Issue Year 2005 Volume: 5 Issue: 2

Cite

APA *(1), S. A. D., (2), S. E., (3), K. S., (4), E. A. (2005). Some Biological Aspects of Thornback Ray (Raja clavata L., 1758) in the Southeastern Black Sea. Turkish Journal of Fisheries and Aquatic Sciences, 5(2).
AMA *(1) SAD, (2) SE, (3) KS, (4) EA. Some Biological Aspects of Thornback Ray (Raja clavata L., 1758) in the Southeastern Black Sea. Turkish Journal of Fisheries and Aquatic Sciences. April 2005;5(2).
Chicago *(1), Sefa Ayhan Demirhan, Semih Engin (2), Kadir Seyhan (3), and Erhan Akamca (4). “Some Biological Aspects of Thornback Ray (Raja Clavata L., 1758) in the Southeastern Black Sea”. Turkish Journal of Fisheries and Aquatic Sciences 5, no. 2 (April 2005).
EndNote *(1) SAD, (2) SE, (3) KS, (4) EA (April 1, 2005) Some Biological Aspects of Thornback Ray (Raja clavata L., 1758) in the Southeastern Black Sea. Turkish Journal of Fisheries and Aquatic Sciences 5 2
IEEE S. A. D. *(1), S. E. (2), K. S. (3), and E. A. (4), “Some Biological Aspects of Thornback Ray (Raja clavata L., 1758) in the Southeastern Black Sea”, Turkish Journal of Fisheries and Aquatic Sciences, vol. 5, no. 2, 2005.
ISNAD *(1), Sefa Ayhan Demirhan et al. “Some Biological Aspects of Thornback Ray (Raja Clavata L., 1758) in the Southeastern Black Sea”. Turkish Journal of Fisheries and Aquatic Sciences 5/2 (April 2005).
JAMA *(1) SAD, (2) SE, (3) KS, (4) EA. Some Biological Aspects of Thornback Ray (Raja clavata L., 1758) in the Southeastern Black Sea. Turkish Journal of Fisheries and Aquatic Sciences. 2005;5.
MLA *(1), Sefa Ayhan Demirhan et al. “Some Biological Aspects of Thornback Ray (Raja Clavata L., 1758) in the Southeastern Black Sea”. Turkish Journal of Fisheries and Aquatic Sciences, vol. 5, no. 2, 2005.
Vancouver *(1) SAD, (2) SE, (3) KS, (4) EA. Some Biological Aspects of Thornback Ray (Raja clavata L., 1758) in the Southeastern Black Sea. Turkish Journal of Fisheries and Aquatic Sciences. 2005;5(2).