The activity of glutathione-S-transferase (GST) in blood cells, liver, spleen and gonads in five Black Sea fish species horse mackerel Trachurus mediterraneus (Staindachner), high body pickarel Spicara flexuosa (Rafinesque), shore rockling Gaidropsarus mediterraneus (L.), round goby Neogobius melanostomus (Pallas), scorpion fish Scorpaena porcus (L.) caught in coastal area of Sevastopol (Black ...

Concentration of blood serum albumin of the round goby Neogobius melanostomus caught in Black Sea and Azov Sea was studied in relation to age, sex, maturation and season. Albumin concentration in fish from Azove Sea was 3-fold higher than in the animals from Black Sea. Albumin level in fish serum depended on fish physiological status, maturation, age, season and geographical location. The varia...

The round goby (Neogobius melanostomus Pallas 1811) is a non-native species in the Gulf of Gdańsk. The aim of this article is to assess the absolute fecundity and attempt to describe the gonad development cycle of round goby specimens from the Gulf of Gdańsk. The stages of gonad development were classified according to the modified Nikolski (1963) scale for perciformes, which was adapted for th...

The fishery of bony fishes has an economic important in southern part of Caspian Sea ,but there are few reports about the pathogens of them in this area .Eustrongylides excisus , a parasite (Nematoda: Dioctophymidae) can damage the muscles of bony fishes . So, consumers avoid to buy the infected fish. Hence , the parasite can cause economic loss.In order to determine the occurance and intensity...

Scanning Electron Microscopy was used to describe the eggs of Georgecraigius fluviatilis (Lutz). Length is 722.8±39.6 µm and width is 177.1±9.8 µm. Diameter of the micropylar disk, surrounded by an irregular flattened collar, is 28 µm. The outer chorionic sculpture consists of cells of irregular shapes, containing tubercles with pitted surface. In the ventral region, tubercles of several diamet...

This first comprehensive study of the peripheral olfactory organ from a representative of the large and economically important order of teleost fishes, the Perciformes, shows a compact structure with olfactory sensory neurons distributed widely throughout the olfactory chamber. The spatial organization of the nasal cavity in the bottom-dwelling round goby (Gobiidae, Neogobius melanostomus) was ...