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Age Determination Of Shad (Alosa Pontica Eichwald,1838) Inhabiting The Black Sea, Savaş Yilmaz, Nazmi̇ Polat
Age Determination Of Shad (Alosa Pontica Eichwald,1838) Inhabiting The Black Sea, Savaş Yilmaz, Nazmi̇ Polat
Turkish Journal of Zoology
The most reliable bony structure and method were investigated for age determination of shad (Alosa pontica Eichwald, 1838) inhabiting the Black Sea. Therefore, five bony structures such as scale, vertebra, otolith, opercle and subopercle were removed from 240 individuals collected from April 1998 to April 1999. Each bony structure was prepared for age determination by different techniques, and examined by binocular microscope. Mean ages were estimated for each bony structure-reader combination and the precision of age estimated from multiple readings was evaluated. Furthermore, the error of ageing was calculated. Vertebra was the most reliable bony structure for ageing this species …
A Preliminary Study On The Population Dynamics Parameters Of Whiting (Merlangius Merlangus Euxinus) In Turkish Black Sea Coastal Waters, Ali̇ İşmen
Turkish Journal of Zoology
Some population parameters of the whiting (Merlangius merlangus euxinus) distributed along the Turkish Black Sea coast, were determined by using age-length data. The mean annual growth rate in length was found to be 3.7 cm. The maximum age group was determined as IX for females and VI for males. The seasonalized von Bertalanffy growth parameters in length were estimated to be L_o=39.1 cm, K = 0.15 year^{-1}, t_o = -1.53 year, C=0.23, t_s=0.48. There was a difference in growth rate between male and female fish. The females grow faster than males and reach a greater maximum length. Total mortality and …