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

Yıl 2005, Cilt: 5 Sayı: 2, - , 01.04.2005

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

Öz

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.

Anahtar Kelimeler

Thornback ray Raja clavata Black Sea food maturation

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

Yıl 2005, Cilt: 5 Sayı: 2, - , 01.04.2005

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

Öz

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.

Anahtar Kelimeler

Thornback ray Raja clavata Black Sea food maturation

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Ayrıntılar

Birincil Dil Türkçe
Bölüm Makaleler
Yazarlar

Sefa Ayhan Demirhan *(1) Bu kişi benim

Semih Engin (2) Bu kişi benim

Kadir Seyhan (3) Bu kişi benim

Erhan Akamca (4) Bu kişi benim

Yayımlanma Tarihi 1 Nisan 2005
Yayımlandığı Sayı Yıl 2005 Cilt: 5 Sayı: 2

Kaynak Göster

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. Nisan 2005;5(2).
Chicago *(1), Sefa Ayhan Demirhan, Semih Engin (2), Kadir Seyhan (3), ve 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, sy. 2 (Nisan 2005).
EndNote *(1) SAD, (2) SE, (3) KS, (4) EA (01 Nisan 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), ve 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, c. 5, sy. 2, 2005.
ISNAD *(1), Sefa Ayhan Demirhan vd. “Some Biological Aspects of Thornback Ray (Raja Clavata L., 1758) in the Southeastern Black Sea”. Turkish Journal of Fisheries and Aquatic Sciences 5/2 (Nisan 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 vd. “Some Biological Aspects of Thornback Ray (Raja Clavata L., 1758) in the Southeastern Black Sea”. Turkish Journal of Fisheries and Aquatic Sciences, c. 5, sy. 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).