Spatial and temporal variations of anchovy eggs and larvae, Engraulis encrasicolus (Linnaeus, 1758), around Gökçeada Island, North Aegean Sea
İsmail Burak Daban, Ahsen Yüksek, Aytaç Altın
Faculty of Fisheries Science and Technology, Çanakkale Onsekiz Mart University, Çanakkale, TURKEY
Department of Marine Biology, Institute of Marine Sciences and Management, İstanbul University, Istanbul, TURKEY
Fisheries Department, School of Applied Sciences at Gökçeada, Çanakkale Onsekiz Mart University, Çanakkale, TURKEY
ORCID IDs: İ.B.D. 0000-0002-2973-5698; A.Y. 0000-0003-3004-7443; A.A. 0000-0002-0327-6665
This study describes the spatio-temporal distribution patterns of anchovy eggs and larvae around Gökçeada Island in the North Aegean Sea. Monthly vertical samplings were performed at nine stations in one year period between June 2013 and May 2014. In total, 306 eggs, 198 prelarvae and 248 postlarvae were sampled. It was observed that spawning season of anchovy was between May and October, whereas spawning took place at 15.9 °C and peaked at 20.8-23.2 °C in June and August. Total egg biomass was determined as 1199.8 ind/m² and mean egg biomass was 33.5 ind/m². Total prelarvae and postlarvae biomass were detected as 776.2 ind/m² and 972.2 ind/m², respectively. Maximum abundance of prelarvae and postlarvae were seen in August (540 n/m2) and September (492 n/km2), respectively. Total mortality of eggs was detected as 12.4%, highest mortality was observed in July (30.9%) and majority of mortality realized in gastrula stage (stage 3) (85%). It was understood that the eggs were concentrated in the east and the larvae in the South as strong north winds and currents effected their distribution.
Keywords: Anchovy, fish eggs, fish larvae, spawning, North Aegean Sea
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