A PRELIMINARY STUDY ON THE BIOLOGY OF THE ROUND SARDINELIA SARDINELLA AURITA VALENCIENNES, 1847 IN IZMIR BAY (CENTRAL AEGEAN SEA OF TURKEY) B. Bayhan 1, M. Kaya 1, T. M. Sever 1, A. Kara 2, B. Taylan 1, O. Heral 1, H. Saygi 3 and M. A. Canyurt 3* 1 Ege University Faculty of Fisheries, Department of Hydrobiology, 35100 Izmir, TURKEY. 2 Ege University Faculty of Fisheries, Department of Fish Capture and Processing Technology, 35100 Izmir, TURKEY. 3 Ege University Faculty of Fisheries, Department of Aquaculture, 35100 Izmir, TURKEY. -
[email protected] Abstract This study describes the length and weight frequency distributions, condition factor and length -weight relationships of round sardinella Sardinella aurita Valenciennes, 1847 from Izmir Bay, Turkey. Fish samples were collected monthly (October 2010 September 2011) during commercial fishing trials using gillnet from Izmir Bay. A total of 707 specimen of S. aurita were used for this study. Fish total lengths ranged from 12.1 to 27.1 cm The condition factors were calculated for seasonally with minimum and maximum values as 0.740 (Winter snd Spring) and 0.940 (Summer) for all individuals respectively. Keywords: Population Dynamics, Aegean Sea, Izmir Bay, Pelagic
Material and Methods Fish samples were collected monthly (October 2010 - September 2011) during commercial fishing trials using gillnet from Izmir Bay. A total of 707 specimen of S. aurita were used for this study [4]. The length–weight relationship was determined for males and females according to the equation W = a Lb, where W is total weight (g), L the total length (cm), The parameters a and b were calculated by functional regression, as was the coefficient of determination (r²). The b value for each species was tested by t-test at the 0.05 significance level to verify that it was significantly different from the isometric growth (b=3). a the intercept and b the coefficient of the functional regression between W and L [3]. condition factor estimated by K=W *100/L3 [1]. Results and Discussion Fish total lengths ranged from 12.1 to 27.1 cm (Fig. 1).
Fig. 2. Seasonal condition factor (CF) for Sardinella aurita from Izmir Bay.
Acknowledgment This research was supported by the Ege University, Scientific Research Project No. 2010/SUF/020.
References
Fig. 1. Length frequency distribution of all individuals (female+male). The parameters ‘a’ and ‘b’ of the length-weight relationships (LWRs) were calculated as W=aLb and LWRs for males, females and the total sample population determined to be W=0.0056L3.126, W=0.0069L3.063 and W=0.0032L3.304 respectively. The values for allometric coefficient b of the length-weight relationships showed positive allometric growths in the both sexes. All allometric coefficients (b) estimated in this study were within the expected range 2.1-3.7, and according Benegal and Tesch [1978] allometric coefficients may range from 2 to 4. The condition factors were calculated for seasonally with minimum and maximum values as 0.740 (Winter snd Spring) and 0.940 (Summer) for all individuals respectively (Fig. 2).
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Rapp. Comm. int. Mer Médit., 40, 2013
