Određivanje starosti i rasta cipla zlatara, Liza aurata (Risso, 1810) iz Jadrana primjenom metode očitavanja ljuski i analize dužinskih frekvencija

The age and growth of golden grey mullet, Liza aurata (Risso, 1810), were determined from specimens collected in the Mirna estuary (northern Adriatic Sea) during December of 2001, 2002 and 2003. The age composition was established using scale readings and Bhattacharya’s method. Nine age classes ranging from 3.2 to 13.2 years (except 10.2 and 11.2) were defined by scale readings but only seven (age 3.2: 23.29 cm, age 4.2: 26.75 cm, age 5.2: 29.05 cm, age 6.2: 31.18 cm, age 7.2: 32.71 cm, age 8.2: 34.42 cm and age 9.2: 35.50 cm) were obtained by Bhattacharya’s method. Total length ranged between 21.7 and 40.4 cm. Mean length and weight at age data, as derived using scale readings, were used to estimate the growth parameters of the von Bertalanffy equation: L∞=40.0, K=0.214, to=-1.150; W∞=606g, K=0.162 and to=-1.962. The length-weight relationship indicated positive allometric growth (b=3.069).Starost i rast cipla zlatara, Liza aurata (Risso, 1810) su određeni na jedinkama ulovljenima u estuariju rijeke Mirne (sjeverni Jadran) tijekom prosinca (2001, 2002, 2003 godina). Starost je određena očitavanjem ljusaka i Bhattacharya-vom metodom. Devet starosnih grupa u rasponu od 3,2 do 13,2 godina (osim 11,2 godine) je određeno čitanjem ljusaka, dok ih je samo sedam utvrđeno pomoću Bhattacharya-ve metode (3,2 god: 23,29 cm; 4,2 god: 26,75 cm; 5,2 god: 29,05 cm; 6,2 god: 31,18 cm; 7,2 god: 32,71 cm; 8,2 god: 34,42 cm; 9,2 god: 35,50 cm). Ukupna duljina cipla zlatca je bila u rasponu od 21,7 do 40,4 cm. Srednje dužine i mase pojedinih starosnih godišta očitanih na ljuskama su korištene za izračunavanje parametara von Bertalanffy-eve jednadžbe rasta: L∞=40,0; K=0,214; to=-1,150; W∞=606 g, K=0,162 and to=-1,962. Dužinsko-maseni odnos ove vrste je ukazao na pozitivan alomertijski rast (b=3,069)