This study was carried out to reveal bacterial contamination and antibiotic resistance profiles of isolated bacteria in the hatchery systems of trout farms located in the Eastern Black Sea region of Turkey. Inlet water, egg, alevin and fry samples of 11 different trout farms were examined in terms of bacterial contamination in four different basins. After sampling, isolated bacteria were identified by making phenotypic and genotypic analyses. The majority of a total of 43 strains belongs to the genera Aeromonas and Pseudomonas, but also Lelliottia sp., Bacillus sp. and Lactococcus lactis were isolated from hatchery systems. Considering all basins, except for the 2nd basin, the highest antibiotic resistance of bacteria was against Ampicillin. The lowest antibiotic resistance percentages were determined against gentamicin and enrofloxacin. As a result of the research, the detection of different bacteria in the samples taken from the inlet water of fish farms showed presence of different bacteria contaminating the hatchery water. It thereby stressed the need for improved hygiene measures in these farms.
In the present study, naturally infected albino convict cichlids (Cichlasoma nigrofasciatum) were examined bacteriologically. The result of the examination Puseudomonas putida was isolated from the fish. After this result, comparing the difference of this infection in normal and albino fish was aimed. So, the challenge test trial system for this purpose was settled. Normal and albino fish were infected with stocked bacteria, and the results were observed. At the end of the experiment, all albino fish were observed to have died due to infection. Whereas deaths were not observed in the normal fish. As a result, albino fish (Cichlasoma nigrofasciatum) were found to be more sensitive to Puseudomonas putida infection than normal fish.Öz: Sunulan bu çalışmada doğal olarak enfekte olmuş çiklit (Cichlasoma nigrofasciatum) balıkları bakteriyolojik olarak incelenmiştir. Bakteriyolojik muayene sonrası balıkardan Puseudomonas putida bakterisi izole edilmiştir. Bu sonuçlar sonrası normal ve albino çiklit balıklarının bu bakteriye karşı hassasiyetinin karşılaştırılması amaçlanmıştır. Bu yüzden, bir deneme düzeneği hazırlanmıştır. Normal ve albino balıklar bu bakteri ile enfekte edilmiş ve sonuçlat takip edilmiştir. Deneme sonucunda bütün albino balıkların öldüğü, normal balıklarda ise ölüm olmadığı gözlemlenmiştir. Sonuç olarak albino balıkların (Cichlasoma nigrofasciatum) normal balıklara göre Puseudomonas putida enfeksiyonuna daha hassas olduğu ortaya konulmuştur.
Used as a component of polycarbonate plastics and epoxy resins in the modern industrial world, bisphenol A (BPA) is one of the highest volume produced industrial chemicals worldwide. BPA causes important environmental problems including endocrine disrupting effect on the organisms in aquatic environments. This study focused on the histopathological, oxidative and hematological effects of long-term BPA exposure on wild vimba bream (Vimba vimba) for the first time. Twenty-five fish stocked in each aquarium and exposed to 1000 μg/L BPA for four weeks. Hematological parameters of fish did not differ significantly compared to control group. The antioxidant activity of liver and gill tissues created a significant partial difference between the groups. According to the histopathological studies, intense hyperplasia and necrosis were detected in the gill tissues of the fish exposed BPA. In addition, hypertrophy and epithelial lifting symptom were partly observed. Vocalization and hypertrophic cells was determined in the liver tissues. In conclusions, this study revealed that BPA had an oxidative and especially histopathologically adverse effects on V. vimba, even though it did not have a hematological effect on the treated fish. Although BPA has adverse effects on the health of aquatic organisms, future studies should focus on the residue in fish meat and risk assessment on human health.
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