Conference paper (QAM)

Permanent URI for this collection

http://localhost:4000/handle/123456789/313

Browse

Browsing Conference paper (QAM) by Author "Lakshmanan, P.T."

Now showing 1 - 6 of 6
  • Item
    Concentrations of metals in euthynnus affinis and thunnus albacares from arabian sea
    (Society of Fisheries Technologists(India),Cochin, 2003) Renjith, K.R.; Lakshmanan, P.T.; Mukundan, M.K.
    Concentrations of total mercury (Hg), cadmium, lead, copper, zinc, manganese, etc., were determined in two species of tuna viz., Euthymws affinis and Thunnus albacares caught from the Arabian sea. The mean value of nine metals present in the edible muscle and other body components like liver, gut, etc., are presented. The levels of Hg, Cd, Cu, Zn, and Mn increased with length in E. affmis. The highest level of Hg was around 0.17 ppm in E. ajjinis. while Cd showed a value of -0.37 ppm. The levels of all other metals were below permissible limits recommended by international bodies. In these two species, none of the toxic metals exhibited a hazardous level. Regression analysis of metal content with length showed a positive correlation in E. affinis. From the viewpoint of food safety, tuna from Arabian sea does not cause any concern.
  • Item
    Fish spoilage and quality assessment
    (Society of Fisheries Technologists (India), Cochin, 2000) Lakshmanan, P.T.
    Fish is a highly perishable commodity. Spoilage of fish begins as soon as the fish dies. In tropical conditions, fish spoils quite rapidly, within a few hours of landing, if not properly cooled. The spoilage rate of fish may be reduced by good handling practices and effective temperature control from the very beginning.
  • Item
    K-Value, an index for estimating fish quality during iced storage
    (Cochin University of Science And Technology, 1998) Lakshmanan, P.T.; Iyer, T.S.G.; Antony, F.D.; Gopakumar, K.
    The quality of four species of marine finfish, viz., white pomfret (Pampus argenteus), jew fish (Pseudosciaena sp.), rainbow sardine (Dussumieria hasseltii) and ribbon fish (Lepturacanthus savala) and two species of prawns poovalen (Metapenaeus dobsoni) and karikkadi (Parapenaeopsis stylifera) and the squid (Loligo duvaceli) stored in ice was evaluated by measuring the levels of breakdown products of adenosine triphosphate (IMP and hypoxanthine), K-value, volatile bases and sensory methods. In general, the initial K-value in these species were in the range of >1 to 7% and it increased with storage time. The rate of nucleotide degradation differed between species. The K-value of prawns, squid, pomfret and rainbow sardine exceeds 50% after 8-10 days storage in ice whereas the K-values of other two fin fish species increased quite rapidly. Relatively, higher levels of AMP had been recognised in postmortem prawn muscle. K-value appeared to be a good index of fish freshness. Sensory characteristic were well correlated with K-value.
  • Item
    National and international quality standards for fish and fishery products
    (Society of Fisheries Technologists (India), 2000) Lakshmanan, P.T.
    Food standards have been introduced on a national/international basis to protect the consumers health and to ensure fair practices in food trade. The formulation of standards for fish products became necessary to attain a minimum standard of cleanliness and hygiene in fish handling, processing and marketing. The exporting country or company should be aware of the quality requirements of the buying nation. Standards are intended to guide and promote export or import of fishery products between countries. Some Governments of all countries are responsible for public health problems arising from the consumption of fish products, they enforce certain food laws and introduce standards.
  • Item
    Seasonal variations in trace metal content in bivalve molluscs, villorita cyprinoides var. cochinensis (hanley), meretrix casta (chemnitz) & perna viridis (linnaeus)
    (Council of Scientific & Industrial Research (India), 1983) Lakshmanan, P.T.; Nambisan, P.N.K.
    Concentrations of Fe, Cu, Zn and Pb in the molluscs studied were influenced by season. Highest concentrations of these metals were found during low salinity and low pH of the habitat water (monsoon periods). Metal concentrations decreased in these species in summer months--the period of high salinity and pH. Fe was the most abundant trace metal in all the 3 species. Significant negative correlations were observed between trace metal content in the tissues of the molluscs and habitat water salinity. Nearly all the 4 metals were positively correlated in the clams, V. cyprinoides and M. casta . In P. viridis only a few combinations (Cu/Zn, Cu/Pb and Zn/Pb) were significantly correlated. The levels of various metals studied in these bivalves were well below the permitted limits recommended for these metals in marine products.
  • Item
    Trace metals in fish and shellfish
    (Society of Fisheries Technologists(India),Cochin, 2000) Lakshmanan, P.T.
    Finfish and shellfish accumulate chemicals from the polluted environments. The chemical residues of concern are certain heavy metals, polychlorinated biphenyls (PCBS) and other pesticides. Their abnormal levels in seafood pose hazards to public health. Background levels of trace metals in seawater and freshwater over the world are given here.