FT Vol.55(2)
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- ItemChilled storage studies of depurated cooked clam meat in two different packaging materials(Society of Fisheries Technologists (India), Cochin, 2018)The biochemical and microbiological parameters of depurated cooked meat of black clam (Villorita cyprinoides) (Gray, 1825) was assessed for the extension of shelflife in iced condition in two different packaging materials viz., Polyester polyethylene laminate (PEST-PE) and low density polyethylene (LDPE). Aerobic plate count revealed that the shelflife of black clam was 22 days in PEST-PE and 16 days in LDPE during which the count reached 5.38 log cfug-1 and 4.9 log cfug-1, respectively. The clam meat stored in LDPE had a TBA value of 1.36 mg MDAkg-1 on 16th day and it was 1.23 mg MDAkg-1 for PEST-PE packed meat on the 22nd day. The values of TVB-N was 7.0 mg% and 7.4 mg% after 16 days and 22 days in the LDPE and PESTPE, respectively. Since the value of APC was 5.38 log cfug-1 on the 16th day for clam meat packed in LDPE it was not analysed further as the microbiological count exceeded the limit of acceptability. From this study it is inferred that the shelflife of clam meat may be extended by proper icing after packaging in suitable packing material like PEST-PE.
- ItemEffect of different organic acids on survival of larvae and control of water microflora in milkfish (Chanos chanos) hatchery system(Society of Fisheries Technologists (India), Cochin, 2018)This study reports the use of organic acids (acetic, malic, formic and citric) in fish larval rearing systems for survival and controlling the microflora of rearing water. The milk fish (Chanos chanos) larvae was treated for 10, 15, 30 and 60 min with seven concentrations (%) viz., 1, 0.2, 0.1, 0.075, 0.05, 0.025 and 0.02 of organic acids respectively. The percentage survival was zero (1, 0.2, and 0.1% conc) for all the organic acid at various time periods. The effective concentrations for treating fish larvae are 0.05, 0.05, 0.025 and 0.075% concentrations of acetic, malic, formic and citric acid, respectively where 100% survival was observed. Similarly, when the larval rearing water was treated with different concentrations of same organic acids and time period, complete inhibition of microbial flora was observed (1, 0.2 and 0.1% conc) for all organic acids at various time periods. However, at concentrations less than 0.1%, total bacterial count (TBC) and presumptive Vibrio count (PVC) were found in the range of 3.19 to 5.75 and 2.22 to 3.58 log 10 cfu ml-1. In contrast, TBC and PVC in control group were found in the range of 6.37 to 6.90 and 4.35 to 4.74 log 10 cfu ml-1. The acid treatment with concentrations of 0.075, 0.05 and 0.025 except formic acid at 0.025, 0.020 significantly (p<0.05) improved the survival rates of fish larvae and reduced both TBC and PVC in larval rearing water. The present findings strongly recommend the use of organic acids for treating fish larvae for improved survival and also for reducing pathogenic bacterial load from larval rearing waters.
- ItemFormaldehyde in seafood: A review(Society of Fisheries Technologists (India), Cochin, 2018)Seafood is a nutrient rich commodity accepted all over the world. Illegal addition of formalin (37% formaldehyde) to seafood for extending shelf life affects the health of consumers as it is identified as a potential carcinogen by International Agency for Research on Cancer (IARC). The occurrence of naturally varying levels of formaldehyde present in different food materials including seafood due to post-mortem enzymatic reaction makes the monitoring of illegally added formalin difficult. Understanding the natural levels of free formaldehyde along with proper regulation and monitoring of this harmful chemical is essential for safeguarding health of seafood consumers.
- ItemInfluence of vitamin C on hematololy of Pangasianodon hypophthalmus (Sauvage, 1878) juveniles during pre and post-challenge with Aeromonas hydrophila (Chester, 1901)(Society of Fisheries Technologists (India), Cochin, 2018)A 60-day feeding trial was conducted to know the effect of vitamin C on the hematological responses of Pangasianodon hypophthalmus juveniles during pre- and post-challenge conditions with Aeromonas hydrophila. A total of seven purified diets were prepared with 0 (control), 17.5 (T1), 35 (T2), 70 (T3), 175 (T4), 350 (T5) and 700 (T6) mg ascorbic acid (AA) equivalent per kg of diet, supplied as Lascorbyl- 2-polyphosphate (LAPP) and fed to triplicate group of P. hypophthalmus juveniles (mean initial body weight: 3.23±0.01 g to 3.38±0.01 g) for 60 days twice daily. After the feeding and after challenging with A. hydrophila, the haematological parameters were measured in P. hypophthalmus juveniles. All haematological parameter values (except albumin-globulin ratio) viz., serum glucose, total protein, albumin, globulin, hemoglobin (Hb), total erythrocyte count (TEC), total white blood cells count (WBC), hematocrit value (HCT) increased significantly (p<0.05) in treatment groups than control (vitamin C depleted diet). Further, the increased hematological values for most of the parameters were observed in the range of 175 to 350 mg AA kg-1. Therefore, it is suggested that dietary supplementation of 175 to 350 mg AA kg-1 diet would be beneficial for the optimal hematological responses for P. hypophthalmus juveniles
- ItemEmpirical modelling of drying characteristics of elongate glassy perchlet (Chanda nama) (Hamilton, 1822) in solar hybrid dryer(2018)This study was conducted to evaluate the performance of solar dryer with electrical back-up to produce quality dried Glassy perchlet (Chanda nama). Insolation of the experimental region varied from 25 to 1025 W m-2. Atmospheric temperature showed a variation between 29.5 to 34.5°C. Relative humidity outside the dryer ranged from 56 to 76.5% showing a direct relationship with temperature. Drying experiment was carried out for 10 h at drying air temperature of 60°C. Relative humidity and velocity of drying air inside the drying chamber was 68% and 0.8 m s-1 respectively. Drying conditions were maintained inside the dryer by electrical back-up. Weight loss of pre-processed C. nama during drying was measured at 1 h duration. Drying characteristic data were fitted into empirical drying models. Two-term model was found to be the best fit for the drying characteristic data under specified conditions (R2=0.998, RMSE=0.016 and χ 2=0.00027).