FT Vol.40(1)
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- ItemTenderised, Dehydrated Steaks of Freshwater Fish, Rohu: Preparation and Storage Characteristics(Society of Fisheries Technologists (India)Cochin, 2003)A process to prepare tenderised, dried steaks of freshwater fish, rohu (Labeo rohita) is reported. Steaks of fresh rohu were treated with papain for tenderisation, followed by dip treatment in sodium chloride solution. The brined steaks were dried either in a solar or tunnel dryer at a maximum temperature of 60oC Although solar drying required a longer drying time than tunnel drying, the products dried by both ways, had comparable proximate composition, with moisture content in the range of 15 to 16%, 59% protein and 5.7% crude fat. The aerobically packaged product, which had a water activity as low as 0.66, did not favour microbial growth when stored at ambient temperature. Tenderisation reduced hardness of dried product as observed by lower breaking force as well as sensory evaluation. The treatment also enhanced rehydration capacity of the dried steaks. Tenderisation followed by solar drying is suggested as a cost-effective process for value addition of rohu.
- ItemShelf life Extension of Whole and Steaks of Rohu (Labeo rohita) by Gamma Irradiation(Society of Fisheries Technologists (India)Cochin, 2003)Fresh rohu were procured from the local market and packed in polyethylene pouches and were subjected to gamma irradiation as whole or steaks at a dose of 0, 1 or 2 kGy. The treated fish and steaks were stored under ice. At periodic intervals, quality of the fish was determined by sensory, microbiological and chemical parameters. The unirradiated whole fish and steaks were acceptable up to 14 and 20 days in comparison to a storage life of 28 and 32 days for the respective samples irradiated at 1 kGy. Irradiation of whole fish at 2 kGy gave a shelf life of 35 days. The extent of lipid oxidation due to irradiation was not significant and had no effect on sensory quality of the ice-stored fish.
- ItemPrevalence and Antibiotic sensitivity of Escherichia coli in Extensive Brackish water Aquaculture Ponds(Society of Fisheries Technologists (India)Cochin, 2003)Prevalence and antibiotic resistance of Escherichia coli in the water and sediment samples of brackish water aquaculture ponds adjacent to Cochin backwaters was analysed. More than 50% of the water samples and more than 80% of sediment samples from all the sampling stations were tested positive for £. coli. Risk assessment of the E. coli strains was carried out using multiple antibiotic resistance (MAR) indexing. Majority of the strains were found to be multiple antibiotic resistant suggesting their origin from high risk sources of contamination such as human where antibiotics are frequently used. While none of the £. coli strains were resistant against amikacin, chloramphenicol, streptomycin and trimethoprim, considerable levels of resistance was encountered against ampicillin, erythromycin, penicillin G and vancomycin. High prevalence of £. coli in the water and sediment samples of this extensive brackish water ponds indicates high degree of faecal pollution of this environment. The high risk nature of the strains warrants efficient post harvest and processing measures to avoid health risk to consumers.
- ItemLeaching and Residual Kinetics of Chloramphenicol Incorporated Medicated Feed Treated to Juvenile Black Tiger Shrimp Penaeus monodon(Society of Fisheries Technologists (India)Cochin, 2003)The leaching rate of chloramphenicol (CAP) incorporated medicated feed after immersion in water was high during the first 10 min. About 30% loss of CAP from the medicated feed was observed after 2 h of immersion. The leaching rate was not uniform in the period of 10 h experiments. Juvenile black tiger shrimp Penaeus monodon fed for 7 days with recommended dose (50-100 mg/kg shrimp) of CAP were examined for residual accumulation and depletion. A higher residue of 7.10 mg/g shrimp tissue was found after 1 day of postdosing. This was estimated as 2.15% of the total CAP intake in the7 days of experimental period. By the 20th day following cessation of medicated feed treatment the CAP concentration was found below detectable limit.
- ItemEffect of Treatments on the Iced storage Shelflife of Cuttlefish (Sepia aculeata) Fillets(Society of Fisheries Technologists (India)Cochin, 2003)Effect of dip treatments in 2% salt + 0.2% citric acid solution and in 0.01% butylated hydroxy anisole (BHA) solution, each for 10 minutes, on the biochemical and organoleptic quality of ice stored cuttlefish {Sepia acwteflte-Orbigny) fillets is reported. The salt + citric acid treatment was found to improve the appearance and overall quality of the fillets. Non protein nitrogen (NPN) and alpha amino nitrogen contents were higher in the salt+citric acid treated sample.The salt+citric acid treated sample was organoleptically in good condition for four days and fair upto six days of storage in ice. No discolouration was noticed in any of the samples during the period of storage