Sains Malaysiana 44(5)(2015): 657–662

Otolith Shape Analyses and Dimensions of the Anchovy Engraulis encrasicolus L. in the Black and Marmara Seas

(Analisis Bentuk Otolit dan Dimensi Ikan Bilis Engraulis encrasicolus L. di Laut Hitam dan Marmara)

MELEK ZENGІN*, SEMRA SAYGІN & NAZMІ POLAT

Ondokuz Mayis University, Faculty of Art and Sciences, Biology Department, Atakum,

Samsun

Received: 4 September 2014/Accepted: 30 December 2014

ABSTRACT

Otoliths, which can be used for the evaluation of relationships between the environment and organisms, are structures consisting of calcium carbonate. The aim of this study was to realize the shape analysis. In addition, it is to detect the characteristics of otolith biometrics in order to determine the relationship between the fish size of Engraulis encrasicolus L. from the Black and Marmara Seas. The samples were obtained from the Black and Marmara Seas between December 2013 and February 2014. The relationships between the TL (Total length) and OL (Otolith length), TL and OB (Otolith breadth), and TL and OW (Otolith weight) were determined using the linear regression equation. Form factor, roundness, circularity and rectangularity were used for shape analyses. According to the data, there was no difference between localities (p>0.05). Moreover, there was no difference between the left and right otoliths of the individuals sampled from the same locality (p>0.05). According to the regression coefficient for relationships of TL-OL, TL-OB and TL-OW, otolith length was identified as the best index for estimating fish length (r2>0.70). It showed that index values were statistically different between two populations (p<0.001).

Keywords: Black Sea; Engraulis encrasicolus; Marmara Sea; otolith dimensions; shape analysis

ABSTRAK

Otolit yang boleh digunakan untuk menilai hubungan antara persekitaran dan organisma, adalah struktur yang terdiri daripada kalsium karbonat. Kajian ini bertujuan untuk merealisasikan analisis bentuk. Di samping itu, ia juga bagi mengesan ciri-ciri otolit biometrik untuk menentukan hubungan antara saiz ikan Engraulis encrasicolus L. dari Laut Hitam dan Marmara. Sampel diperoleh dari Laut Hitam dan Marmara antara Disember 2013 dan Februari 2014. Hubungan antara TL (Jumlah panjang) dan OL (panjang Otolit), TL dan OB (kelebaran Otolit) serta TL dan OW (berat Otolit) telah ditentukan dengan menggunakan persamaan regresi linear. Faktor bentuk, kebundaran, kebulatan dan segi empat tepat telah digunakan untuk analisis bentuk. Mengikut data, tiada perbezaan antara lokaliti (p>0.05). Selain itu, tiada perbezaan antara otolit kiri dan kanan daripada sampel dari kawasan yang sama (p>0.05). Menurut pekali regresi bagi hubungan TL-OL, panjang otolit TL-OB dan TL-OW telah dikenal pasti sebagai indeks terbaik untuk menganggar panjang ikan (r2>0.70). Ini menunjukkan bahawa nilai indeks berbeza secara statistik antara dua populasi (p<0.001).

Kata kunci: Analisis bentuk; dimensi otolit; Engraulis encrasicolus; Laut Hitam; Laut Marmara

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*Corresponding author; email: melek.zengin@omu.edu.tr