FT Vol.50(4)

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    Biochemical and Microbial Changes during Ice Storage of Mystus gulio and Puntius sophore
    (Society of Fisheries Technologists (India)Cochin, 2013) Nath, Kapil Deb; Majumdar, R.K.; Debbarma, Sujata
    Biochemical, microbial and organoleptic changes in two commercially important fishes (Mystus gulio and Puntius sophore) during ice storage have been studied. Ash content, lipid content, total nitrogen and non-protein nitrogen showed a decreasing trend whereas pH and salt soluble nitrogen showed reverse trend during the ice storage period. TVBN increased to 29.87 mg% on 10th day in P. sophore whereas, it crossed the border line of spoilage on 13th day in M. gulio. Aerobic plate count reached to 106g-1 on day 13 and day 10 for M . gulio and P. sophore respectively. Results obtained in the sensory analysis correlated well with the observed biochemical changes. The study indicated that the edible quality of M. gulio and P. sophore was maintained upto 13 and 10 days respectively when stored with ice.
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    Changes in Physico-Chemical and Microbial Profiles of Lactic Acid Bacteria Inoculated Fish Mince under Refrigeration Storage
    (Society of Fisheries Technologists (India)Cochin, 2013) Dhar, Bahni; Saha, U.; Sarkar, Sreekanta
    The present study was undertaken to evaluate the effect of lactic acid bacteria (LAB) on storage stability of croaker (Johnius sp.) minced meat under refrigeration storage. Minced meat of croaker was inoculated with Lactobacillus acidophilus and stored at refrigeration temperature (4°C). A control (untreated) sample was also prepared and stored. The samples were analyzed at 0, 7, 14 and 21 days of storage for physico-chemical and microbial characteristics. Decrease in pH of inoculated sample from 6.09 to 5.47 with simultaneous increase in titrable acidity from 0.566 to 0.809 during entire storage indicated acid production by LAB. Microbial counts were lower in inoculated sample than in control. LAB count significantly increased in inoculated sample. The lowering of pH by acid production inhibited microbial growth. Physico-chemical parameters showed a significant (p<0.01) correlation with the microbial counts. Inoculation of LAB in minced fish enhanced its shelf life by inhibiting microbial growth and decreasing the protein and fat degradation product
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    Length-Weight Relationship and Condition Factor of Dawkinsia exclamatio (Pethiyagoda & Kottelat, 2005) from Kallada River of Kerala, India
    (Society of Fisheries Technologists (India)Cochin, 2013) Gladys, F.; Mercy, T. V. A.; Sajan, S.
    Dawkinsia exclamatio is endemic to Kerala region of the Western Ghats and to the best of our knowledge, there is no other reports on the growth studies on D. exclamatio. The results of the present study indicate that population of D. exclamatio in Kallada river follow an isometric growth pattern with ‘b’ values close to cubic law but there was no significant difference in the condition factor of D. exclamatio between length groups. This study adds basic information of this species, which may be useful in fisheries management and also in the conservation point of view.
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    Trawl codend selectivity of torpedo scad, megalaspis cordyla (linnaeus, 1758)
    (Society of Fisheries Technologists (India), 2013) Edwin, L.; Thomas, S.N.; Pravin, P.; Remesan, M.P.; Boopendranath, M.R.
    The torpedo scad, Megalaspis cordyla (Linnaeus, 1758) is a moderately large marine fish belonging to family Carangidae. The largest recorded individual was 80 cm long (TL) (Smith-Vaniz, 1984). It is a high level carnivore with a trophic level of 4.40 and feeds on a variety of fish, cephalopods and crustaceans (Kasim, 2003; Rajanna et al., 2006; Vivekanandan et al., 2009). The torpedo scad is distributed throughout the tropical and subtropical waters of the Indian and west Pacific Oceans (Froese & Pauly, 2011). Boopendranath & Pravin (2005) have reviewed trawl selectivity and presented selectivity parameters reported for some fishes caught in Indian waters.
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    Co-infection of Yellowtip Halfbeak Fish (Hemiramphus marginatus) with Isopod and Copepod Parasites from the Coromandal Coast, India
    (Society of Fisheries Technologists (India)Cochin, 2013) Sethi, Satyanarayan; Jithendran, K. P.; Kannappan, S.
    In some fishes, parasitic associations are possible, but rare, including simultaneous associations of several large parasites (Trilles et al., 1996). Cymothoids and Digeneans are frequently associated with fish. This is the first report on the occurrence of an infection by two parasitic crustaceans in the halfbeak fish from the southeastern coast of India. Such double parasitism, involving a branchial cymothoid and a pennellid copepod, is probably uncommon, but not accidental. Cymothoids infect several species of fish. Mance (juvenile parasitic stages of cymothoid) feed voraciously and easily kill fry and fingerlings. Adultsparasite which are permanently attached to the hosts, result in stunted growth and also affect reproduction. Parasites in the gill chamber are usually associated with deformed gills. This may lead to severe economic loss in the commercial species of the marine fishes of India
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    Technology evaluation model for rural innovations – case study of rubberwood fishing craft for the small-scale fisheries sector
    (Society of Fisheries Technologists (India), 2013) Gopal, N.; Edwin, L.
    The use of rubberwood (Hevea brasiliensis) for fishing craft construction is an innovation introduced by the Central Institute of Fisheries Technology (CIFT), Cochin, Kerala, India. Technology evaluation is an integral part of any technology development to place the technology in its proper perspective. This paper presents a simple model of evaluating the technology by describing the Planning, Monitoring and Evaluation (PME) cycle and assessing impact through patent profiling, cost evaluation and looking at the social benefits. It has been observed that introduction of the technology has made available an alternative timber to the traditional boat building industry. Reduction in cost of construction to the tune of 28% and overall reduction of 35-40% in maintenance costs has been possible. FRP sheathed rubberwood fishing crafts are maintenance free. A patent profiling of the technology revealed that for use of rubberwood in traditional fisheries for canoe construction, there are no patents except for the ones filed by CIFT. Social benefits include availability of a cheap fishing craft for fishing operations which is the sole livelihood option of the traditional fishermen.
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    Prevalence of Transferable Oxytetracycline Resistance Factors in Aeromonas hydrophila in Fish Hatcheries
    (Society of Fisheries Technologists (India)Cochin, 2013) Bharathkumar, G.; Abraham, T. Jawahar
    The distribution of motile aeromonads and prevalence of transferable oxytetracycline resistance factors in Aeromonas hydrophila of Indian major carp and catfish hatcheries in West Bengal, India were studied. Counts of motile aeromonads in carp hatching pool water (4.23 - 4.54 log cfu ml-1), carp larval rearing water (3.36 - 3.93 log cfu ml-1) and catfish larval rearing water (5.41 - 5.85 log cfu ml-1) of different hatcheries did not vary much. The motile aeromonad counts in the range of 2.81 - 4.28 log cfu carp larva-1 and 6.08 - 6.69 log cfu g-1 catfish larvae were recorded. The sensitivity of 48 Aeromonas strains to six antibiotics was observed to be in the following descending order: gentamycin, chloramphenicol, ciprofloxacin, nitrofurantoin, oxytetracycline and co-trimoxazole. The incidence of multiple antibiotic resistance (MAR) in motile aeromonads was significantly high (p<0.05) in catfish hatcheries (95%) than in carp hatcheries (41%). The prevalence of MAR in A. hydrophila (69%) was high, but not significant (p>0.05) than in A. caviae (55%). The mutation frequency of A. hydrophila strains to oxytetracycline (25 μg ml-1) was in the range of 6.71×10-9 - 1.60×10-6. The oxytetracycline resistance factors of size 20.13 and 25.41 kb from A. hydrophila were transferred to Escherichia coli K12 at a frequency of 2.70×10-6 - 5.35×10-3. It is probable that these bacteria carrying resistant factors may be the source of spreading antibiotic resistance to other environmental and pathogenic bacteria, which share the same aquatic environment.
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    Body Composition of Ompok bimaculatus (Bloch 1794) from Tripura Waters with respect to Body Size, Condition Factor and Sex
    (Society of Fisheries Technologists (India)Cochin, 2013) Debnath, Chandan; Sahoo, Lopamudra
    It is therefore concluded that if it is impossible to determine the proximate composition of O. bimaculatus directly, body constituents can be estimated from weight or length of the fish using predictive regression models with a reasonable amount of accuracy.