Antibiotic accumulation, growth performance, physiologic status and intestinal flora diversification of Nile tilapia (Oreochromis niloticus) feed by diets supplemented with different dose of sulfamethoxazole

Abstract Background Sulfamethoxazole (SMZ) is an antibiotic used globally to treat fish disease in aquaculture, but the effects of exposure to legal aquaculture doses of SMZ in fish are still unclear. To comprehensively investigate the effects of exposure to legal doses of sulfamethoxazole (SMZ) in Nile tilapia (Oreochromis niloticus), fish were exposed to diets supplemented with different doses of SMZ (blank group, normal feed; LS, 0.67 g/kg; MS, 6.67 g/kg and HS, 33.33 g/kg) for 4 weeks. General SMZ accumulation, growth performance, physiologic status, intestinal and hepatic health were systemically evaluated. Results The exposure experiment indicated that the SMZ accumulation in O. niloticus muscles, intestinal and aquaculture environment were positively related to the exposure dose. And withdrawal of antibiotics feed after 4th week, the SMZ residual in fish muscles, aquaculture water and sediment gradually decreased to safe level. LS and MS amount of antibiotics promoted the growth of fish accompanied by reduced feed coefficient in treated groups, while the fish growth in HS group was retarded. Exposure of O. niloticus to SMZ also increased the content of TG, promoted liver hypertrophy, and increased number of fat particles in liver. Antibiotics changed the content of intestinal short-chain fatty acids (SCFAs), and the changes in acetic acid were the most obvious. SMZ exposure reduced the biological diversity of the intestinal flora subsequently induced microbiota dysbiosis, and the degree was positively related to the exposure doses, and the experimental mainly inhibiting the growth of Fusobacteria. Conclusions Overall, exposure to of fish to legal doses of SMZ impair general physiological functions, intestinal flora and provokes health risk in fish. This study highlights the importance of rational and regulated use of SMZ in aquaculture.

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Evaluation of use effective microorganisms (EM) with different feeding strategies on growth performance, body chemical composition and economic efficiency of monosex Nile tilapia Oreochromis niloticus juveniles

Aquatic Living Resources ◽

10.1051/alr/2021021 ◽

2021 ◽

Vol 34 ◽

pp. 21

Author(s):

Mohamed F. Abdel-Aziz ◽

Yaseen A. Abdel-Tawwab ◽

Mohamed F. Sadek ◽

Abdel Moneim M. Yones

Keyword(s):

Chemical Composition ◽

Growth Performance ◽

Economic Efficiency ◽

Oreochromis Niloticus ◽

Nile Tilapia ◽

Basal Diet ◽

Feed Utilization ◽

Fish Growth ◽

Feeding Strategies ◽

Effective Microorganisms

A factorial trial was conducted to detect the effect of different feeding strategies of supplementation of effective microorganisms (EM) liquid on the growth performance, feed utilization, body chemical composition and economic efficiency of monosex Nile tilapia (Oreochromis niloticus) juveniles. Three experimental treatments were formulated a basal diet without any addition of EM (control; A), a diet supplemented with 2% EM (B), and a diet supplemented with 4% EM (C). All treatments were offered to fish through two different strategies of feeding the meal: 2/3 in the morning and 1/3 in the afternoon or 1/3 in the morning and 2/3 in the afternoon. Each treatment was replicated three times. Juveniles Nile tilapia with an average initial body weight of 3.85 ± 0.22 g (± SE) were randomly stocked at a rate of 90 juveniles per 1.5 m3 tank. Fish growth performance and feed utilization significantly (P ≤ 0.05) increased with increasing EM supplementation and were positively affected by different feeding strategies. Moreover, the economic evaluation showed that there were more benefits by when using the 4% EM diet and feeding 2/3 of daily meal in the morning.

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Some Biological Observations on Rearing Juveniles of Nile Tilapia (Oreochromis niloticus (Linnaeus, 1758)) in Fixed Cages at Gezira Irrigation Canals, Sudan

Asian Journal of Fisheries and Aquatic Research ◽

10.9734/ajfar/2021/v11i130192 ◽

2021 ◽

pp. 1-7

Author(s):

Sana Yagoub Abdallah Tahir ◽

Abdalla Gadain Alnaiem ◽

Egbal Osman Ahmed

Keyword(s):

Body Weight ◽

Growth Performance ◽

Oreochromis Niloticus ◽

Nile Tilapia ◽

Fish Growth ◽

Quality Analysis ◽

Irrigation Canal ◽

Irrigation Canals ◽

Final Body Weight ◽

Effect Of Water

This study was conducted at Gezira Irrigation canal to evaluate the growth performance and the effect of water tempetrature to the culture ability of Nile tilapia juveniles for 120 days. Monosex Oreochromis niloticus sized 8.17±0.33 g were carried out from Mabroka fish farm and stocked in 400 m³ fixed cages at a density of 50 fish/m³. Fish were fed daily with a commercial pellet diet with 33% protein concentration at a feeding rate of 3% of their body weight per day. Feed was given twice a day (09:00 morning and 16:00 evening). Fish growth parameters, water quality analysis have measured every two weeks. The final body weight of fish was 40.23±1.04 grams and the mean daily gained weight was 0.29 g/day, while the survival rate of fish was 99.7%±6.7 and the Food Conversion Ratio (FCR) was 3.8. The average value of temperature, pH and transparency were 23°C, 7.5, 31.5 cm respectively. The results of the study revealed that there is a possibility to culture tilapia juvenile at stocking density of 50/m³ in fixed cages in Irrigation Canals, for the effect of water temperature on fish growth performance the results obtained that no more effect on fish growth during study period.

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