Oxytetracycline Residue in Hybrid Striped Bass Muscle |
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| Authors: | Dehai Xu Wilmer A Rogers |
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| Institution: | Department of Fisheries and Allied Aquacultures, Alabama Agricultural Experiment Station, Auburn University, Alabama 36849–5419 USA |
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| Abstract: | Hybrid striped bass ( Morose saxatilis male × M. chrysops female) were injected with 25 and 50 mg oxytetracycline (OTC) per kg of fish. Rate of elimination of OTC from muscle tissue and inhibition of bacteria by muscle injected with OTC were studied. OTC residue in muscle of fish injected with 50 mg OTC/kg fish was much higher (P < 0.01) than that in fish injected with 25 mg/kg and took a longer time to clear from the muscle. In fish injected at 25 mg OTC/kg of fish, OTC was completely eliminated from muscle in 24 d; the rate of elimination constant (β) was 0.278/day and the half-life (t1/2) 2.5 d. In fish injected at 50 mg OTC/kg of fish, the OTC was not depleted in fish muscle until 32 d after injection; the rate of elimination constant 13 was 0.265/day and the half-life was 2.6 d. No statistical difference was found in muscle OTC residue between male and female fish. Size of fish (16.5 to 21.5 cm and 21.6 to 25.5 cm) made little difference in OTC residue in muscle. Muscle removed from fish injected with 25 mg/kg OTC 12 d after injection inhibited the growth of Vibrio anguillarum, V. ordalii and Aeromonas hydrophila in cultures. |
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