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Geru L.,Sanitary Veterinary Directorate for Food Safety | Trofimov A.,Institute of Research and Development for Aquatic Ecology | Ruxanda F.,University of Agricultural Sciences and Veterinary Medicine, Cluj-Napoca | Rus V.,University of Agricultural Sciences and Veterinary Medicine, Cluj-Napoca | And 3 more authors.
Annals of the Romanian Society for Cell Biology | Year: 2012

In order to follow the evolution of the ovary during the oogenesis cycle in the Danubian pike, captures were made at the beginning of May, end of August, November and April. The macroscopical investigations have shown a slow development of the ovary from May until August, after which a more rapid one takes place, until it occupies the whole abdominal cavity and significantly distorts it starting from November. After spawning in April, the ovary gradually regains its former size from the previous year (May). The microscopical investigation has shown the presence of a heterogeneous population of small oocytes in May and starting from August two different types of oocytes could be observed: large, relatively homogeneous and small heterogeneous. Only large oocytes are engaged in the oogenesis cycle, fact showing that the pike ovary is the group synchronous type. There were no pathological aspects, thus demonstrating that the Danubian water is at such quality standards that allow the course of oogenesis in pike.

Aprodu I.,University of Galati | Vasile A.,University of Galati | Gurau G.,University of Galati | Ionescu A.,University of Galati | Paltenea E.,Institute of Research and Development for Aquatic Ecology
Annals of the University Dunarea de Jos of Galati, Fascicle VI: Food Technology | Year: 2012

The knowledge of the feed requirements of fish species allows developing well-balanced feed formulations for successful intensive culture. The target of this study was to investigate the effect of supplementing the fish fodder with different types of oils, on fish growing and meat quality. The experiments were conducted on common carp using olive, soy and fish oil preparations. The results of these experiments showed that increasing the content of fats in fish diet allowed a faster growth of common carp and better weight increasing results. The fatty acids and aminoacids profiles of the fish meat highly depended on the type of oil used in the feeding experiment. According to our results, out of the tested variants the fish oil based fodder is most favorable for fish feeding, allowing the accumulation of large quantities of highly unsaturated fatty acids in meat.

Coada M.T.,University of Galati | Cristea V.,University of Galati | Patriche N.,Institute of Research and Development for Aquatic Ecology | Patriche T.,University of Galati | And 3 more authors.
Journal of Environmental Protection and Ecology | Year: 2011

The paper presents preliminary results on growth of juvenile Russian sturgeons in an open intensive system. The experiment was conducted at the farm SC Beluga Farm Grup SRL in Tamadau, the Calarasi county. Stocking biomass was provided trough artificial reproduction of sturgeons captured in the Danube. The experiment lasted about 131 days and 30 fiberglass rearing tanks were used. The initial density was 12.5 kg fish/m3 per tank and the feed practice was appropriate to the development status of the sturgeons. During the experiment were evaluated the following technological parameters: monthly weight gain, daily weight gain and monthly average weight of biomass culture. Also, the physical and chemical parameters of used water were maintained between the limits of optimum range specific to sturgeon growth.

Gergely I.,Basin Water | Romocea J.-E.,University of Oradea | Oprea L.,University of Galati | Sion C.,University of Galati | Calin P.G.,Institute of Research and Development for Aquatic Ecology
AACL Bioflux | Year: 2011

The paper presents the research regarding the structure of fish communities with a view to assess the quality of water in the Crişuri Hydrographic Area. It is also a comparative study of the ichtyofauna composition in the '60s and the 2004-2009 period. In order to inventorize and describe the ichtyofauna of the Crişuri Hydrographic Area, periodical campaigns for fish sample prelevation by means of electric fishing were conducted over a period of six years. This inventory comprises the main Crişuri watercourses and their streams, totalizing a number of 98 prelevation sections. Consequently, 33 fish species were identified, some of which (Thymallus thymallus, Eudontomyzon danfordi) of very low density, some others (Chondrostoma nasus, Squalius cephalus, Barbus barbus, Barbus petenyi) in expansion for mountaineous regions. This upstream re-location of some species was noticed in each hydrographic basin.

Vasile D.,Ovidius University | Tenciu M.,Institute of Research and Development for Aquatic Ecology | Patriche N.,Institute of Research and Development for Aquatic Ecology | Costache M.,University of Bucharest | And 4 more authors.
Carpathian Journal of Earth and Environmental Sciences | Year: 2015

Pollution represents one of the main reasons for the decline of sturgeons in the Danube River, together with overfishing, damming, poaching, habitat lost, lack of effective management. Although water pollution by heavy metals in the Danube is considered to be very high, there is no specific data available on its impact on sturgeons Acipenser stellatus (stellate sturgeon), one of the three anadromous sturgeons existing presently in the Danube, which is critically endangered under IUCN Red List 2010 (International Union for Conservation of Nature) and listened in Appendix II of CITES (Convention on International Trade in Endangered Species of Wild Fauna and Flora). Nowadays it is believed to be extinct from the upper and middle Danube. The aim of this study was to assess the acute toxicity of copper and zinc on stellate sturgeon juveniles by semi-static renewal test, according to OECD (Organisation for Economic Cooperation and Development) guidance, using dechlorinated tap water with a hardness of 340 mg/l CaCO3. The LC50 values for copper and zinc ions, were determined to be 0.547 mg/l for Cu2+ and 34.22 mg/l for Zn2+ respectively, according to the probit method. Even if the calcium ions offer a clear protection against copper and zinc toxicity in the conditions of high water hardness, Acipenser stellatus species, remains very sensitive to the toxicity of these two metallic ions, with LC50 values lower than for other fish species.

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