FT Vol.39(2)

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    Indole as an Index of Spoilage of Mackerel (Rastrelliger kanagurta) during Storage at Ambient Temperature and in Ice
    (Society of Fisheries Technologists (India), 2002) Omar, Nadia Mahmud
    A study was conducted to find out any correlation between indole and the spoilage indices such as Tri Methyl Amine Nitrogen (TMAN), Total Volatile Base Nitrogen (TVBN) and Total Bacterial Count (TBC) during spoilage of mackerel (Rastrelliger kanagurta) at ambient temperature and in ice. Mackerel had a shelf life of 6 and 9 h at ambient temperature based on the sensory evaluation of whole mackerel and cooked meat respectively. After 9 h of storage at ambient temperature TVBN, TMAN and indole were only 25.2 mg/100, 5.75 mg/ 100 and 0.3 |ig/100g respectively. The bacterial load was 5.55 log CFU/g. Mackerel had a shelf life of 6 and 9 days in ice based on the sensory evaluation of whole and cooked fish respectively. TVBN, TMAN and indole were only 14.35 mg/100, 0.67 mg/100 and 0.4 |ig/100g respectively. Total bacterial count was 6.36 log CFU/g. All the indices studied were low when the mackerel was rejected but this was specially true of indole which was detected in negligible amounts through out the storage period and also showed no trend through out. So indole was found to have no significance as an index of spoilage of mackerel kept at ambient temperature and in ice.
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    Standardization of Mesh Size of Gill Nets for the Commercial Exploitation of Kawakawa, Euthynnus affinis (Cantor) in Thoothukkudi Coastal Waters, Southeast coast of India
    (Society of Fisheries Technologists (India)Cochin, 2002) Jude, D; Neethiselvan, N; Gopalakrishnan, P; Sugumar, G
    Euthynnus affinis forms notable fishery in Thoothukkudi coastal waters with peak season from June to September. Euthynnus affinis is captured in small meshed gillnets popularly called 'PODIVALAI' with mesh size ranging from 60 mm to 115 mm. The present study deals with the standardization of mesh size to capture the commercially significant length group (476-600 mm) of E. affinis and its enmeshing pattern in gillnets with three different mesh sizes. The optimum mesh size for the commercial exploitation of £. affinis in Thoothukkudy coastal waters is found to be 104.2 mm. Further, the study recommends to discourage the use of gill net with 50 mm mesh size for the capture of E. affinis as this net captures the juveniles of £. affinis.
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    Primary Productivity of the Brackishwater Impoundments along Nethravathi estuary, Mangalore in Relation to Some Physico-chemical Parameters
    (Society of Fisheries Technologists (India)Cochin, 2002) Rajesh, K.M; Gowda, G; Mendon, Mridula R
    Primary productivity of brackishwater impoundments along Nethravathi estuary was studied for one year from Feb. 1998 to Jan. 1999. The primary productivity values varied from 1.78 to 13.47 mgC/m3/h and it exhibited a bimodal pattern of distribution with primary peak in May followed by a secondary peak in September. Lower values were recorded during monsoon season (June-Aug). Chlorophyll-a values observed to range from 2.83 to 9.71 mg/ m3 with higher values recorded during monsoon season and lower values in the month of Dec/Jan. The seasonal trend of phaeopigment exhibited trimodal peak during March, November and July
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    Pattern of Pigment Migration in Second Cheliped of Macrohrachium rosenhergii with Morphotypic Transformation
    (Society of Fisheries Technologists (India)Cochin, 2002) Ranjeet, K; Kurup, B. Madhusoodana
    Changes in cell shape of chromatophores and subsequent pigment migration on the second cheliped of the three main male morphotypes of Macrohrachium rosenhergii are discussed. Cell enlargement as part of pigment accumulation in chromatophore was found to be maximum in Blue clawed males (1.5 \im), followed by Orange clawed males (1.1 m) and Small males (0.65 (im) in male morphotypes of M. rosenhergii. The concentration of pigments at localized sites facilitated by chromatophoric extension through microtubules gave characteristic orange and blue colour to the cheliped, which could directly or indirectly be modulated by the chromtophoric hormones (CH) or pigment dispersing hormones (PDH).
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    L-asparaginase Activity in Growing Conditions of Streptomyces spp. associated with Therapon jarbua and Villorita cyprinoids of Veli Lake, South India
    (Society of Fisheries Technologists (India)Cochin, 2002) Dhevendaran, Kandasamy; Anithakumari, Y.K
    Streptomyces spp. isolated from the gut of fish, Therapon jarbua and shellfish, Villorita cyprinoids exhibited L-asparaginase activity under growing conditions in a liquid broth. Streptomyces AQBTJ 60 (isolate from fish) showed maximum enzyme activity at pH 8.0 whereas Streptomyces AQB VC67 showed it at pH 7.0. They showed optimum enzyme activity and growth at temperature 370C. Carbon sources and amino acids had varying influence based on the constituents in the gut or viscera of the host organisms and heavy metals inhibited activity and growth. Similar trend was noticed with sodium chloride in the estuarine strains.