ISSN 2285-5750, ISSN CD-ROM 2285-5769, ISSN-L 2285-5750, ISSN Online: 2393 – 2260

Published in Scientific Papers. Series D. Animal Science, Vol. LXII, Issue 2
Written by Eduard Ştefan LAZU, Marian BURA, Ioan BĂNAŢEAN-DUNEA, Alin Cosmin POPESCU, Tiberiu IANCU, Ioan PEŢ, Dorel DRONCA, Silvia PĂTRUICĂ, Eliza SIMIZ, Marioara NICULA, Gabi DUMITRESCU, Mirela AHMADI, Dumitru POPESCU, Nicolae PĂCALĂ

Researchers have been conducted in the Timis River, which springs from the Semenic Mountains, in the western part of Romania. On its course on Romania's territory were established 6 sampling stations (Accumulation Three waters- Feneşti Confluence, Teregova, Lugoj-CFR Bridge, Lugoj-Timişana Confluence, Şag and Grăniceri) where analyzes were made of the chemical composition of the water. Analysis of the results showed an increase from upstream to downstream of 5 days-biochemical oxygen demand (B.O.D.5) (from 1.75 to 3.66 mg/l), also the accumulation of nitrates (from 1.53 to 3.08 mg/l), nitrites (from 0.01 to 0.10 mg/l), chloride (from 2.50 to 8.51 mg/l) and water hardness (from 1.12 to 6.02 dH°).

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Published in Scientific Papers. Series D. Animal Science, Vol. LXIII, Issue 1
Written by Paul UIUIU, Daniel COCAN, Radu CONSTANTINESCU, Călin LAȚIU, Alexandru SAVA, Cristina HEGEDŰS, Aurelia COROIAN, Andrada IHUȚ, Camelia RĂDUCU, Vioara MIREȘAN

Water quality parameters determines the success or the failure of a fish culture operation, so any proper-prepared plan for aquaculture must describe the quality and quantity of water available for this purpose. The aim of this study was to evaluate the physical and chemical water parameters in Rainbow trout culture, in the summer season from three salmonid farms, due to the environmental changes that are nowadays happening and affect the fish culture operation. The water samples were collected from Bistrița-Năsăud County, from three trout farms: Strâmba, Șoimul de Jos and Fiad, in the summer of 2018, between May and August. For the determination of water parameters (dissolved oxygen, total dissolved solids, electrical conductivity and resistivity, pH, temperature, salinity) was used the Hanna HI 9828/4- 01 Multi-Parameter and for the chemical parameters (total ammonia, nitrates, nitrites) samples were transferred to the USAMV laboratories. The samples collection was made in each farm from three different places: catchment, basins and evacuation water areas. The results of the study showed that the parameters observed from the three farms were different, with major differences in month of July and August. The environment of fish aquaculture is a complex system with critical parameters as are the temperature, suspended solids, dissolved oxygen, nitrite and ammonia. However, the temperature and the dissolved oxygen are the most important parameter, requiring continuous monitoring in aquaculture production systems, due to the fish aerobic metabolism which requires an elevated level of dissolved oxygen at optimum temperatures.

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Published in Scientific Papers. Series D. Animal Science, Vol. LXII, Issue 1
Written by Erzsébet-Timea DOMOKOS, Alexandru Liviu MĂRGHITAȘ, Daniel DEZMIREAN, Otilia BOBIȘ, Adriana URCAN

Staphylococcus aureus is an extraordinarily adaptable pathogen with a proven ability to develop resistance. It is notorious for its ability to become resistant to antibiotics. Infections that are caused by antibiotic-resistant strains often occur in epidemic waves that are initiated by one or a few successful clones. Also, it is a virulent pathogen that is currently the most common cause of infections in hospitalized patients. S. aureus infection can involve any organ system. The success of S. aureus as a pathogen and its ability to cause such a wide range of infections are the result of its extensive virulence factors. It is well-known that from ancient times the herbal world was the answer for many bacterial diseases. Throughout the years numerous investigations concerning the inhibition of S. aureus by spices, herbs, their extracts, essential oils and various constituents have been reported. Many of these plant extracts possess significant antimicrobial activity, which in many cases is due primarily to a particular constituent: polyphenols, flavonoids, alkaloids. Interpretation and results comparison of various studies is complicated by variations in the methodology used for the determination of antimicrobial activity.

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Published in Scientific Papers. Series D. Animal Science, Vol. LXIII, Issue 1
Written by Magda NENCIU, Victor NIȚĂ, Aurelia ȚOȚOIU

An essential aspect for developing mussel (Mytilus galloprovincialis Lamarck, 1819) aquaculture at the Romanian Black Sea coast is the classification of culture areas from the microbiological point of view, in compliance with European Commission Regulation no. 854/2004. According to this document, the indicator species is the bacteria Escherichia coli and thresholds have been set to classify the bivalve culture areas for human consumption: for class A, no post-harvest treatment is required to reduce microbiological contamination, while for classes B and C purification, relaying or cooking by an approved method are mandatory. In this context, monthly samples were collected from three sampling points along the Romanian coast and the contamination of mussel tissue and intravalvular liquid with E. coli was analyzed. The reference method for analysis was the Most Probable Number (MPN), as mentioned by European standard EN/ISO 16649-3. The aim of this research was to assess the zoo-sanitary and food safety suitability of the most indicated areas for shellfish culture, previously selected taking into account the environmental constraints of the Romanian coast (no sheltered areas, currents, strong winter winds).

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