FT Vol.59(1)
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- ItemRural Women Entrepreneurship through Value Addition ofFish: A Case Study(Society of Fisheries Technologists (India), 2022-02-02)
- ItemComparison of the Single Agar and Double Agar layer methods for Enumeration of Bacteriophages(Society of Fisheries Technologists (India), 2022-02-02)
- ItemEffect of Trap Funnel angle on Fish Capture Efficiency(Society of Fisheries Technologists (India), 2022-02-02)
- ItemListeria monocytogenes Biofilms on Glass surface: Survivaland Efficacy of two Sanitizing Agents for Inactivation(Society of Fisheries Technologists (India), 2022-02-02)Listeria monocytogenes is a very important seafoodborne pathogen, which is capable of forming biofilm on different food-contact surfaces. The efficiency of two commonly used sanitizing agents of seafoodprocessing industry was checked for inactivation of this pathogen in biofilm formed on glass surface. Treatment with 220 ppm sodium hypochlorite for 5 min and 1000 ppm benzalkonium chloride for 30 sec could totally inactivate the L. monocytogenes ATCC 19115 in the biofilm. Reduction of the level of this organism to a great extent was possible even at lower concentration in case of both the sanitizers. However, the planktonic cells were found to be highly susceptible. Treatment with 130 ppm sodium hypochlorite for 5 min or 100 ppm benzalkonium chloride for 30 sec can totally inactivate planktonic cells of L. monocytogenes. During storage at 30ºC, the L. monocytogenes could be recovered from the biofilm upto 26 days of storage. The concentration of chlorine (50-100 ppm), which is commonly used for disinfection different surfaces of seafood-processing plants, can reduce the level of this pathogen to a great extent. The findings of the present study will be helpful in designing proper guidelines for prevention of transmission of L. monocytogenes through seafood-processing plants.
- ItemNutritional Evaluation of Fish feeds Formulated with Fishdiscards or Shellfish waste as Alternative Protein Sources(Society of Fisheries Technologists(India), 2022-02-02)In the present study, nutritional profiling of the alternative main protein sources (AMPs) such as shellfish waste, fish offal and by-catch were carried out to evaluate the possible role to replace the fishmeal in the diet. Five diets were prepared with 40% (by weight) dried filtrate of autolyzed prawn and crab wastes (Diet A), dried fish offal (Diet B), dried by-catch (Diet C), a mixture of dried offal and shellfish waste (1:1 w/w, Diet D) and the reference diet (Diet E) using a commercial fish meal (CFM) as main protein sources. Other ingredients were common to all diets. Proximate composition of CFM, AMPs and five prepared diets were determined. Micronutrient contents, namely, total amino acid content, free amino acids, and fatty acid composition of the prepared diets were also analysed. The nutrient content of AMP was different only in the fish offal, of which the crude protein content (56.96±1.78) was significantly lower than that of the autolysed shellfish waste (71.75±5.38), dried by-catch (65.26±1.63) and CFM (70.06±1.257) (ANOVA, Tukey test, p<0.05). Crude lipid content of fish offal (22.81±0.57) was the highest while that was significantly different from each other (5.26±1.12, 13.55±1.61 and 18.46±0.735 for shellfish waste, dried bycatch, and CFM respectively (ANOVA, Tukey test, p<0.05). Mean crude protein of Diet B and C were significantly lower than that of other three diets. Crude fat, n-6 fatty acids and polyunsaturated fatty acids of four test diets were comparable to those of the reference diet while essential amino acids and n-3 fatty acids were significantly higher in reference diet. Presence of free amino acids in Diets A, C and D is an added quality to use the AMPs in formulating aqua feed. Economically viable feed can be prepared by using AMPs compared to the fishmeal diet and it confirms the possibility to replace fishmeal in formulated fish feed. Feeding trials will confirm the feed palatability, digestibility and growth performances of fish.