FT Vol.55(3)
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- ItemCiguatoxin-an emerging biological hazard among reef fishes of India(Society of Fisheries Technologists (India), Cochin, 2018)Ciguatera Fish Poisoning (CFP) is an emerging food safety hazard which has been reported in southern peninsular India in recent times. Ciguateric fishes mostly associated with coral reef ecosystem are implicated in food poisoning outbreaks. USFDA guidance for fish and fishery products classifies CFP as “reasonably likely to occur” in fishes harvested from coral reef regions. Ciguatera Fish Poisoning has been reported from tropical or subtropical areas around the world between latitudes 35°N and 35°S, particularly in the Caribbean, Pacific and Indian Ocean and in the Flower Garden Banks area in the northern Gulf of Mexico. Action levels for CFP limits are now listed as 0.01 ppb for Pacific and 0.1 ppb for Caribbean ciguatoxin. CFP is considered as a natural toxin and USFDA has listed out 12 group of fishes under ciguatera hazard category. With recent EU import rejections of some of the seafood consignments originated from India, CFP has emerged as an important food safety concern. Although, no fatality has been reported so far, morbidity symptoms observed from cases of hospitalization is a definite concern to the export trade. This review deliberates on the significance of CFP, its distribution and hazard control measures.
- ItemDistribution of potentially pathogenic Vibrio parahaemolyticus in seafood and the aquatic environment in Mumabai, India(Society of Fisheries Technologists (India), Cochin, 2018)The occurrence of total and pathogenic Vibrio parahaemolyticus in fresh seafood and the coastal environment of Mumbai, India was examined in this study. Samples comprising of fish, shellfish, coastal sediment and coastal waters were analyzed for V. parahaemolyticus by selective enrichment and isolation. Biochemically identified isolates were tested for the presence of tlh (thermolabile hemolysin), tdh (thermostable direct hemolysin) and trh (tdh-related hemolysin) by polymerase chain reaction (PCR). While Chromogenic Vibrio (CV) agar yielded V. parhaemolyticus from all samples (100%), TCBS agar yielded V. parahaemolyticus from 57.1% of the samples. The incidence of trh+ V. parahaemolyticus was high, being isolated from 16.4% of the samples analyzed, while the tdh+ V. parahaemolyticus were isolated from 1.4% of samples. Two tdh-, trh+ isolates from the coastal water were positive by a in pandemic group-specific (GS) PCR. The study suggests that seafood and coastal environment may harbor pathogenic V. parahaemolyticus with characteristics of pandemic clones, although their incidence is very low. Further, sodium taurocholate (ST) broth and chromogenic Vibrio (CV) agar combination is highly suitable for the isolation of total and pathogenic V. parahaemolyticus from seafood and environmental samples.
- ItemSeasonal growth and instability of ring seince fishery in Kerala(Society of Fisheries Technologists (India), Cochin, 2018)Ring seine, which is the major fishery of Kerala, contributes 55.7% of the state’s total marine fish production and contributes 21.31% of the total marine landings of the country, out of which 73.4% is of pelagic resources. Even small fluctuation in the annual output of ring seine reflects on the total fish production of the state. Two types of ring seine systems are operating in Kerala, namely, mechanised (fitted with inboard motors or IBM) and motorized (operated with outboard motors or OBM). This paper examines the growth and instability of fish production from the ring seiners operating from central Kerala, India during the period 2002-2011. Time series data on daily landing from 36 fishing vessels, including 27 mechanised and 9 motorized ring seine units were used for the study. The results reveal that there is a positive growth in the production from the mechanised ring seiners while the growth from the motorized sector has been falling over the period under study. The overall instability ranged from 36-38% and was more prominent in motorized vessels.
- ItemComparison of flake ice and gel ice in the preservation of Lethrinus lentjan (Lacepede, 1802) fillets(Society of Fisheries Technologists (India), Cochin, 2018)Effectiveness of different icing, gel ice and flake ice in extending the shelf life of fish fillets (Lethrinus lentjan) (Lacepède, 1802) was evaluated. Samples were taken from preserved samples at two days intervals for organoleptic, biochemical and microbiological analysis up to 16 days of storage. Based on t-test, the biochemical variables viz., pH, Total Volatile Base Nitrogen (TVB-N) and Trimethylamine Nitrogen (TMA-N), ThioBarbituric Acid Value (TBA) Free Fatty Acid (FFA) and Peroxide value (PV) showed a significant difference between two methods of icing at. Organoleptic scores for appearance colour, odour, texture and overall acceptability were tested. The results revealed that there was no significant difference between two methods of icing at 5% level of significance during storage, but the significant difference noticed at 10% level of significance. Based on the biochemical and organoleptic analysis, it is inferred that gel icing was better than flake ice storage for storage up to 8 days. Simple linear regression model (significant R2 value) to the experimental data of both type of icing to quantify the rate of change which indicated a significant increase in the quality indices as the storage days increased. On the other hand the rate of increase of biochemical quality indices was minimum for samples stored in flake ice.