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Daily age and growth rates of larval and juvenile annular seabream, diplodus annularis inhabiting the gökçeada shallow waters
(Centenary University, 2020) Ayyildiz, Hakan; Altin, Aytaç
This study was carried out between June 2013 - June 2014 from Gökçeada shallow waters (0 - 20 m). A total of 190 larvae with a total length of 2.01 mm to 10 mm and 923 juvenile annular seabream with a total length of 11-140 mm were caught by using a plankton net and beach seine. The length-weight relationships of the obtained individuals were calculated as W = 8E-06TL3.1029 (R2 = 0.975). Estimated daily ages ranged from 2 and 19 days for larvae and 18 and 296 days for juveniles. The daily growth rates of larval and juvenile annular seabreams were estimated as 0.398 mm/day and 0.371 mm/day, respectively. Hatching time of the larval annular seabream was estimated to occur during April - September period and reached maximum level in June while the juveniles continued during February - September period and reached maximum level in May. The larval and juvenile annular seabream instantaneous mortality coefficient was calculated as 0.231027 and 0.02984, which represented around 23.1% and 2.98% of daily mortality. Daily survival rates were found as 0.769 for larvae and 0.9701 for juveniles. © 2020, Centenary University. All rights reserved.