Abstract
The study was conducted to evaluate the effect of antibiotic on shelf life in rohu fish, Labeo rohita (Hamilton) under ice storage condition. Oxytetracycline (OTC), the most widely used antibiotic, was fed to rohu (average body weight 16.0 g) at the rate of 2 g/kg through fish diet for 5 days and their shelf life was determined in iced condition. Organoleptically, fish were found to be acceptable up to 16 days before becoming inedible compared to 15 days for control fish which received pelleted diet with no antibiotic under the same condition. Initial moisture, ash, protein, lipid, NPN and TVB-N values were 70.42±1.91%, 2.80±0.10%, 17.90±0.50%, 3.12±0.04%, 0.0086±0.01% and 17.43±0.60 mg/100g respectively in the control which reached at values of 78.45±1.50%, 3.84±0.10%, 13.47±1.00%, 2.80±0.08%, 0.0053±0.001%, 26.17±0.76 mg/100g, respectively after 16 days of ice storage. There was no significant difference for these values compared to control group. In case of total bacterial load, values of aerobic plate count (APC) was 2.0±0.1×103 during the start of ice storage condition which increased significantly to 5.6±0.38×107, exceeding the acceptable limit for ice stored fish. The APC values also did not show any significant variation compared to control fish, suggesting that the use of antibiotic in fish diet had little or no effect on shelf life of rohu fish during ice storage condition. DOI: http://dx.doi.org/10.3329/jbau.v11i2.19946 J. Bangladesh Agril. Univ. 11(2): 385-390, 2013
Highlights
With the expansion and intensification of aquaculture in south Asian countries and other parts of the world, antibiotics have become an integral part to treat bacterial infections of fish, shrimp and other aquatic organisms to ensure health and productivity
Among the antibiotics used to treat different infectious diseases in human, poultry, cattle, aquaculture and other animal husbandry, only a small number of them were approved by EU, FDA and other organizations for use in aquaculture.The FDA has approved five different drugs for use in aquaculture as long as the seafood contains less than a mandated maximum residue limit such as florfenicol, sulfamerazine, chorionic gonadotropin, oxytetracycline dihydrate, oxytetracycline hydrochloride, as well as a drug combination of sulfadimethoxine and ormetoprim (United States Government Accountability Office, GAO, 2011)
Shelf life of antibiotic treated rohu fish was determined by organoleptic, biochemical and bacteriological method and it was found that fish can be kept in iced condition for 16 days which was slightly higher as compared control fish which were acceptable up to 15 days
Summary
With the expansion and intensification of aquaculture in south Asian countries and other parts of the world, antibiotics have become an integral part to treat bacterial infections of fish, shrimp and other aquatic organisms to ensure health and productivity These drugs are applied as a means to treat diseased fishes or for prevention of diseases (Christensen et al, 2006) as the production may get hampered by unpredictable mortalities that may be due to negative interactions between fish and pathogenic bacteria. The vast majority of OTC supplied in mediated feed can be released to the culture system via fish excreta and even the portion of uneaten feed (Hektoen et al 1995) These chemicals have effect on the bacterial population and on the storage condition of fishes. Sometimes these antibiotics are indiscriminately used in the aquaculture system which may result in long term effect on fish and to its consumers
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