AGE, GROWTH AND OTOLITH BIOMETRY-BODY LENGTH RELATIONSHIPS OF RED BANDFISH (Cepola macrophthalma L., 1758) IN THE SEA OF MARMARA, TURKEY
The age, growth, and the otolith biometry-total length relationships of Cepola macrophthalma (Linnaeus, 1758) were investigated. The individuals were caught with beam trawl in the Sea of Marmara from March 2012 to June 2014. The individual with 51.5 cm total length sampled in this study was recorded...
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Published in | Trakya University journal of natural sciences Vol. 21; no. 2; pp. 107 - 113 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
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Trakya University
01.10.2020
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Abstract | The age, growth, and the otolith biometry-total length relationships of Cepola macrophthalma (Linnaeus, 1758) were investigated. The individuals were caught with beam trawl in the Sea of Marmara from March 2012 to June 2014. The individual with 51.5 cm total length sampled in this study was recorded as the new maximum size of C. macrophthalma in the Marmara Sea. The length-weight relationship showed negative allometric growth with a 1.36 b value. Otolith length-otolith weight, otolith width-otolith weight, otolith length-total length, otolith width-total length, otolith length-otolith width and total length-otolith weight relationships were found as OW=0.0002*OL2.6377 (R2=0.91), OW=0.001*OWi2.6215 (R2=0.94), O=0.057*TL+3.2087 (R2=0.57), OWi=0.0316*TL+1.8511 (R2=0.55), OWi=0.527*OL+0.2015 (R2=0.86), OW=0.0004*TL+0.0029 (R2=0.58), respectively. Ages were estimated from 80 otolith readings and the minimum and maximum ages observed were 1 and 5 years, respectively. The growth parameters of the von Bertalanffy equation were calculated as L∞=61.95 cm, K=0.19 year-1, t0 = -0.05 years. A great majority of the stock (77%) consisted of younger individuals (1-2 age groups). Cepola macrophthalma stock consisted of mainly younger individuals which may indicate that an effective fishing pressure is effective on the stock.
Cepola macrophthalma (Linnaeus, 1758)’in yaş, büyüme ve otolit biyometri-total boy ilişkileri araştırılmıştır. Bireyler Mart 2012-Haziran 2014 tarihleri arasında Marmara Denizi'nde algarna ile yakalanmıştır. Bu çalışmada örneklenen 51,5 cm'lik C. macrophthalma bireyinin boyu, Marmara Denizi'nde bu tür için maksimum olarak kaydedilmiştir. Boy-ağırlık ilişkisi denklemine göre büyüme tipi negatif allometrik olarak belirlenmiştir (b=1,36). Otolith boyu-otolith ağırlığı, otolith genişliği- otolith ağırlığı, otolith boyu-total boy, otolith genişliği-total boy, otolit boyu-otolit genişliği, total boy-otolit ağırlığı ilişkileri OW=0,0002*OL2,6377 (R2=0,91), OW=0,001*OWi2,6215 (R2=0,94), OL=0,057*TL+3,2087 (R2=0,57), OWi=0,0316*TL+1,8511 (R2=0,55), OWi=0,527*OL+0,2015 (R2=0,86) OW=0,0004*TL+0,0029 (R2=0,58) olarak hesaplanmıştır. Yaşlar 80 adet otolit okumasından hesaplanmıştır; gözlemlenen en küçük ve en büyük yaşlar sırasıyla 1 ve 5’tir. von Bertalanffy denklemine göre hesaplanan büyüme parametreleri değerleri L∞=61,95 cm, K=0,19 yıl-1, t0 = -0,05 yıl olarak belirlenmiştir. Stoğun büyük çoğunluğu (%77) genç bireylerden (1-2 yaş grubu) oluşmaktadır. Marmara Denizi’nde C. macrophthalma stoğunun daha çok genç bireylerden oluşması stokların av baskısı altında olduğunu düşündürmektedir. |
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AbstractList | The age, growth, and the otolith biometry-total length relationships of Cepola macrophthalma (Linnaeus, 1758) were investigated. The individuals were caught with beam trawl in the Sea of Marmara from March 2012 to June 2014. The individual with 51.5 cm total length sampled in this study was recorded as the new maximum size of C. macrophthalma in the Marmara Sea. The length-weight relationship showed negative allometric growth with a 1.36 b value. Otolith length-otolith weight, otolith width-otolith weight, otolith length-total length, otolith width-total length, otolith length-otolith width and total length-otolith weight relationships were found as OW=0.0002*OL2.6377 (R2=0.91), OW=0.001*OWi2.6215 (R2=0.94), O=0.057*TL+3.2087 (R2=0.57), OWi=0.0316*TL+1.8511 (R2=0.55), OWi=0.527*OL+0.2015 (R2=0.86), OW=0.0004*TL+0.0029 (R2=0.58), respectively. Ages were estimated from 80 otolith readings and the minimum and maximum ages observed were 1 and 5 years, respectively. The growth parameters of the von Bertalanffy equation were calculated as L∞=61.95 cm, K=0.19 year-1, t0 = -0.05 years. A great majority of the stock (77%) consisted of younger individuals (1-2 age groups). Cepola macrophthalma stock consisted of mainly younger individuals which may indicate that an effective fishing pressure is effective on the stock.
Cepola macrophthalma (Linnaeus, 1758)’in yaş, büyüme ve otolit biyometri-total boy ilişkileri araştırılmıştır. Bireyler Mart 2012-Haziran 2014 tarihleri arasında Marmara Denizi'nde algarna ile yakalanmıştır. Bu çalışmada örneklenen 51,5 cm'lik C. macrophthalma bireyinin boyu, Marmara Denizi'nde bu tür için maksimum olarak kaydedilmiştir. Boy-ağırlık ilişkisi denklemine göre büyüme tipi negatif allometrik olarak belirlenmiştir (b=1,36). Otolith boyu-otolith ağırlığı, otolith genişliği- otolith ağırlığı, otolith boyu-total boy, otolith genişliği-total boy, otolit boyu-otolit genişliği, total boy-otolit ağırlığı ilişkileri OW=0,0002*OL2,6377 (R2=0,91), OW=0,001*OWi2,6215 (R2=0,94), OL=0,057*TL+3,2087 (R2=0,57), OWi=0,0316*TL+1,8511 (R2=0,55), OWi=0,527*OL+0,2015 (R2=0,86) OW=0,0004*TL+0,0029 (R2=0,58) olarak hesaplanmıştır. Yaşlar 80 adet otolit okumasından hesaplanmıştır; gözlemlenen en küçük ve en büyük yaşlar sırasıyla 1 ve 5’tir. von Bertalanffy denklemine göre hesaplanan büyüme parametreleri değerleri L∞=61,95 cm, K=0,19 yıl-1, t0 = -0,05 yıl olarak belirlenmiştir. Stoğun büyük çoğunluğu (%77) genç bireylerden (1-2 yaş grubu) oluşmaktadır. Marmara Denizi’nde C. macrophthalma stoğunun daha çok genç bireylerden oluşması stokların av baskısı altında olduğunu düşündürmektedir. The age, growth, and the otolith biometry-total length relationships of Cepola macrophthalma (Linnaeus, 1758) were investigated. The individuals were caught with beam trawl in the Sea of Marmara from March 2012 to June 2014. The individual with 51.5 cm total length sampled in this study was recorded as the new maximum size of C. macrophthalma in the Marmara Sea. The length-weight relationship showed negative allometric growth with a 1.36 b value. Otolith length-otolith weight, otolith width-otolith weight, otolith length-total length, otolith width-total length, otolith length-otolith width and total length-otolith weight relationships were found as OW=0.0002*OL2.6377 (R2=0.91), OW=0.001*OWi2.6215 (R2=0.94), O=0.057*TL+3.2087 (R2=0.57), OWi=0.0316*TL+1.8511 (R2=0.55), OWi=0.527*OL+0.2015 (R2=0.86), OW=0.0004*TL+0.0029 (R2=0.58), respectively. Ages were estimated from 80 otolith readings and the minimum and maximum ages observed were 1 and 5 years, respectively. The growth parameters of the von Bertalanffy equation were calculated as L∞=61.95 cm, K=0.19 year-1, t0 = -0.05 years. A great majority of the stock (77%) consisted of younger individuals (1-2 age groups). Cepola macrophthalma stock consisted of mainly younger individuals which may indicate that an effective fishing pressure is effective on the stock. |
Author | İNCEOĞLU, Haşim ARSLAN İHSANOĞLU, Mukadder İŞMEN, Ali DABAN, İsmail Burak |
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Title | AGE, GROWTH AND OTOLITH BIOMETRY-BODY LENGTH RELATIONSHIPS OF RED BANDFISH (Cepola macrophthalma L., 1758) IN THE SEA OF MARMARA, TURKEY |
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