A new species of Chrysaora is described from five specimens collected off Turkey in the Eastern Mediterranean Sea during December 2018. The species is characterised by its pale exumbrella, milky to creamy in colour, bearing faint and narrow markings, strap-like marginal tentacles, semi-rounded to tongue-shaped lappets, and a prominent dark spot on the exumbrella above each rhopalium. Analysis of the COI gene indicates that it may be most closely related to Chrysaora africana (Vanhöffen 1902), from which it is nevertheless 10.2 % different. It is unclear whether the species represents a previously undetected and endemic species from the Mediterranean, or whether source populations are located in the Red Sea and the northern Indian Ocean.
The aim of this study is to investigate the genetic structure of Dicentrarchus labrax populations sampled in the NorthEast Mediterranean. These are the main areas where the hatcheries collect their broodstock candidates from the wild in Turkey, which is the biggest European sea bass producer in Europe. Five samples collected from the Turkish Levantine and Aegean Sea coasts were analysed in addition to the Atlantic and Ionian samples (total 305 individuals) for 12 microsatellite loci. The present results revealed that the Aegean populations from Homa and Doğanbey, where the sea bass culture is mostly conducted in Turkish Aegean Sea, were closely related (FST 0.00347, P>0.01). Another close relation was found between Yumurtalık and Doğanbey (FST 0.01148, P>0.01), which might be the result of massive fry transfers from Yumurtalık (East Levantine coast) to Doğanbey till 2000 in Turkey. Obtained results also show gene flow from Greek to Turkish Aegean population which most probably was the consequence of frequent juvenile transfers from Greek hatcheries to Turkish fish farms between 2000 and 2010.
Gökkuşağı alabalığında karşılaşılan bazı bakteriyel hastalık etkenlerinin hızlı teşhisi Özet Bu çalışmada, PCR yöntemi ile gökkuşağı alabalığında (Oncorhynchus mykiss) hastalığa neden olan beş farklı patojenin (Aeromonas salmonicida, Aeromonas hydophila, Yersinia ruckeri, Flavobacterium psychrophila ve Renibacterium salmoninarum) hızlı teşhis edilebilmesi için beşyüz elli balık doku (solungaç, böbrek, ağız, deri ve yüzgeç) örneğinden direk olarak elde edilen saf DNA'lar kullanılmıştır. Çalışmamızdaki balık hastalık etkenlerini tespit edebilmek için beş farklı hedef gen bölgesi (gryA, p57, ompTS, n-DNA ve YER) kullanılmış ve bunların PCR reaksiyonları gerçekleştirilmiştir. Sonuç olarak, hastalıklara neden olan etken bakteriler, dokulardan izole edilen DNA'lardaki hedef genlerin PCR methodu kullanılarak tespit edilmesiyle 3-4 saat içerisinde tanımlanmıştır.
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