This study investigated the effects of exogenous lipase supplementation on the growth performance, digestive enzyme activity and body chemical composition of Sparus aurata L. A total of 840 Sparus aurata (7.72 ± 0.05g) were fed eight diets for 60 days. Diets were coded Group 1: Control 1 (G1–14% Lipid); Group 2: Control 2 (G2–22% Lipid); Group 3: 14% Lipid + 0.5 g lipase (G3– 0.5 g/kg); Group 4: 14% lipid + 1.0 g lipase (G4–1 g/kg); Group 5: 14% Lipid + 1.5 g lipase (G5–1.5 g/kg); Group 6: 22% lipid + 0.5 g lipase (G6–0.5 g/kg); Group 7: 22% Lipid + 1.0 g lipase (G7 1 g/kg) and Group 8: 22% Lipid + 1.5 g lipase (G8–1.5 g/kg). There were 8 dietary treatments that included a protein and lipid diet containing (14% and 22%), crude protein (50%) and supplemented with graded levels of exogenous lipase supplementation activity at 0.5, 1, 1.5 and 2 g/kg diet. As a result of the study, G3 group was better in the final weight (64.42 ± 1.06 g), the specific growth rate (3.55 ± 0.01) and the feed conversion rate (1.20 ± 0.18) compared to other groups (P <0.05). Protease, trypsin and alkaline phosphatase activity support growth and their activity increased during the trial. As regards amylase, lipase and aminopeptidase, a decrease in their activity was detected during the research.

Rainbow Trout (RT) Oncorhynchus mykiss Walbaum,1792 the first fish species to be grown intensively in Turkey and the most commonly grown species in dams and lakes today. Aeromonas spp. are found in ecosystems such as freshwater and coastal waters and cause disease in fish. In RT causes death that is characterized by internal organ hemorrhages, such as the spleen, kidney and liver and body surface, ulcerations and congestion. The present study aimed to detect Aeromonas media bacteria in fish samples collected from the RT farms in the South Eastern Anatolia Region of Turkey through bacteriological culturing and MALDI-TOF. Also, it was purposed to determine the antibiotic susceptibility of the agent. Antibiotic susceptibility testing was performed using the Kirby–Baüer disk diffusion method. Separate visits were made to Trout farming facilities in Diyarbakır, Adıyaman, Şanlıurfa, and Batman in January and February 2021, and 30 fish with an average live weight of 200–250 grams (g) were collected from each facility. A total of 1,200 samples were taken from 40 Trout farms. It was detected the causative agent in the liver, kidney, and tissue samples of fish from 28 of the 40 farms. The sensitivity of Enrofloxacin (10 microgram -µg-), Florfenicol (30 µg), Neomycin (10 µg), Amoxicillin (10 µg), Oxytetracycline (30 µg), Erythromycin (10 µg), Gentamycin (10 µg) and Streptomycin (10 µg) were defined at chancing ratios. In conclusion, these bacteria were detected in local farms. These farms must implement measures to minimize stress factors affecting the fish and avoid overstocking. The best methods of protection against infection include avoiding overstocking, low oxygen levels, and unskilled labor.

Background: The Rainbow trout, Oncorhynchus mykiss (Walbaum, 1792) is commercially farmed in the Southeastern Anatolia Region, Turkey. Aeromonas spp. is a widely found bacterium of aquatic ecosystems such as freshwater and coastal water. They are increasingly noticed as critical pathogens. The Rainbow trout causes acute death, that is characterized by internal organ hemorrhages, such as the spleen, kidney and liver body surface, ulcerations and congestion. Methods: This study, investigated a total of 1,200 fish samples from commercial farms in the Southeastern Anatolia region. Aeromonas veronii was isolated from the kidney, liver and tissue of fish on the Blood Agar and McConkey Agar for bacteriological examinations. Isolated strains were identified by MALDİ-TOF. Result: A. veronii infection was observed from 0% to 100% in fish farms that cover different regions of the Southeastern Anatolia region. The sensitivity of oxytetracycline, enrofloxacin, florfenicol, neomycin, erythromycin and amoxicillin were defined at chancing ratios.

This study aimed to determine proximate analysis and fatty acid profile of whole body muscle tissue (WM) and muscles in different parts of the body, including dorsal (D), ventral (V), and caudal (C) regions, of the crimean barbel (Barbus tauricus), which is an species caught from the Gelingüllü Dam. In whole body muscle the protein, lipid, moisture, and ash contents of the fish were 18.61, 1.54, 78.49, and 1.09% respectively. The lipid contents of crimean barbel varied between 1.78 and 2.68%, with the highest and lowest percentages in the C and V regions, respectively. There was a significant difference (P<0.05) in the fatty acid content present in the different parts of the fish. The highest and lowest proportions of saturated fatty acids (SFA) were found in WM (23.03) and D (21.94%) region, respectively. The highest and lowest monounsaturated fatty acid (MUFA) contents were found in the D muscle (36) and V muscles (33.73%), respectively. The proportion of polyunsaturated fatty acids (PUFA) was highest and lowest in C (25.63) and D (22.62%) regions, respectively. The highest eicosapentaenoic acid (4.11) and docosahexaenoic acid (12.98%) contents were found in V and C regions, respectively. The results showed that lipid content and composition of fatty acids may vary in the different body parts of the fish.