Faculty of Fisheries, Department of Marine Biology and Ecology

Hirundichthys rondeletii is among the three flyingfish species showing distribution in the Turkish seas. However, the egg stages of Exocoetidae species found in the Turkish waters have not been documented. Flyingfish eggs were randomly obtained on 16 July 2016 on the coast of Gumuldur, at a depth of approximately 1 m from a sandy bottom. Samples were fixed in a 4% buffered formaldehyde solution. The eggs were described and illustrated. The diameters of spherical fish eggs were between 1.75 mm and 2.05 mm. They have bipolar filaments: a single filament on one pole and 28-33 filaments on the other pole. The maximum length of these filaments was 73 mm. Vitellus in the eggs was homogeneous and did not contain oil globules. The total egg number determined with the gravimetric method was 4319.91 $\pm$ 22. This is the first record of the eggs of black wing flyingfish H. rondeletii found in the Turkish waters.

In order to provide the first comparative source of nematofaunal data at the oxic/anoxic interface off the Sinop Peninsula, southern Black Sea, a survey of meiofauna and nematode fauna was conducted in August 2011 aboard the exploration vessel (E/V) Nautilus with ROV during the Black Sea Expedition NA012. Higher meiofaunal taxa and nematode compositions were investigated. Free-living marine nematodes were the most abundant group at each station. A total of 84 species was found, belonging to 23 families. The suboxic zone was dominated by the nematode Trefusia aff. longicauda (42%). This is the first record of the genus Trefusia De Man, 1893 for the Black Sea. Although many factors have the potential to influence the changes in meiofaunal abundances and composition of the nematode assemblages, we suggest that oxygen reduction indeed affected meiofaunal abundance and nematode composition however a particular preference of several taxa to extreme conditions may be suggested.
Keywords: meiofauna; Nematoda; suboxic; Trefusia, Turkey.