1987

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    Acute Toxicity of Metasystox to \Nedge Clam, Donax cuneatus from west coast
    (Society of Fisheries Technologists (India) Cochin, 1987) MULEY, D. V; AKARTE, S. R; KULKARNI, D. A; RAO, K. R
    96 h acute toxicity tests were performed using commerciaI grade metasystox on the marine wedge clam, Donax cuneatus during summer 1985. The behaviour and mortality rates were recorded periodically. Most of the dams responded in opening the shell valves and extending the siphons quicker in low test concentrations (0.004-0.0052 p.p.m) but this was slow and late in high concentrations (0.0056-0.008 p.p.m). Mortality began to occur in 0.008 p.p.m. from 12 h, whereas, in 0.0052 p.p.m. from 60 h onwards. The observed LC0 value was 0.004 p.p.m. and LC50 0.0064 p.p.m. The regression equation established was Y = 79.0891 + 33.4523 X. The rate of oxygen concentration increased at LC0 and LC50 values compared to control indicating the disturbed physiological adjustment. The results are correlated with physico-chemical parameters of seawater and discussed in the light of pesticide toxicity to the dam.
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    Effect of chilled Sea Water Storage of oil Sardine on quality changes during frozen storage
    (Society of Fisheries Technologists (India) Cochin, 1987) Dora, K.C; HIREMATH, G.G
    The shelf life of frozen oil sardine can be improved by preserving the fish immediately after catch in chilled water before freezing .Delayed icing caused considerable deterioration in quality and reduces frozen shelf life. Oil sardine preserved in chilled sea water were found to be suitable for freezing upto 5 days whereas iced samples could be frozen only upto 2 days .
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    Formulation,Processing and Water Stability of Pelleted Feeds with Varying Levels of Protien used in Carp Nutrition Studies
    (Society of Fisheries Technologists (India) Cochin, 1987) RENUKARADHYA, K. M.; VARGHESE, T. J.
    Four dry pelleted feeds containing 20 %, 30 %, 40 % and 45 % protein were formulated incorporating casein as the main source of protein for m,e in carp nutrition studies. The caloric content in all the feeds was maintained constant. The method of processing is described. The formulated diets were tested for water stability. This test has revealed that the diet containing 20 %, 30 % and 40 % protein had better stability than that containing 45 % protein. This was. due to the· relatively higher fat content in the former tbree diets. However, all the feeds were sufficiently stable at the end of one hour in which time carps are known to utilise supplementary diets.
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    High Temperature Processi g of Fish Sausage III -Studies on Some of the Storage Characteristics
    (Society of Fisheries Technologists (India) Cochin, 1987) RAJ, M. CROSS VICTOR; CHANDRASEKHAR, T. C.
    The proximate compos1t1on of the high temperature processed fish sausage was found to be 14.56 % protein, 4.65 % fat, 69.14 % moisture, 2.12 % ::i.sh and 8.12 % carbohydrate. The quality of the product during storage was assessed on the basis of the changes observed in the physical, chemical and microbiological parameters. The results of the different tests such as pH, volatile base nitrogen (VBN), trimethyl amine nitrogen (TMA-N) and jelly strength are summarised and discussed. The total bacterial load increased gradually during storage but was not proportional to the initial load.
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    Length-Weight relationship and relative condition factor in Daysciaena albida (Cuv.) and Gerres filamentosus (Cuv.)
    (Society of Fisheries Technologists (India) Cochin, 1987) KURUP, B. MADHUSOODANA; SAMUEL, C. T
    The length-weight relationship of Daysciaena alhida and Gerres jilamentosus were calculated separately for indeterminants, mature males and mature females. The logarithmic regression equation obtained for D. albida - males: log w = -1.5055 + 2.8618 log l; females: log w = -0.9260 + 2.4089 log l ; indeterminants: log w = -l.7188 + 3.0616 log l. The regression co-efficients between males and fem ales, males and in determinants and female and in determinants showed significant differences. In G. filamentosus the relationship can be expressed as males: logw = -1.3224 + 2.8740 log 1; females: log w = -1.2874 + 2.8381 log l; indeterminants: log w = -0.8167 + 2.2558 log l. The difference in regression co-efficients between male and female are insignificant at 5 % level whereas significant differences were observed between males and indeterminants and females and indeterminants. The relative condition factor (Kn) was calculated for the above two species. In D. albida the reasons for the :fluctuations of Kn values can be attributed to both spawning cycle as well as feeding intensity whereas in G. filamentosus it synchronises mainly with spawning cycle.
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    Nitrogen Fixing Bacteria, Azotobacter sp. in Aquatic sediments
    (Society of Fisheries Technologists (India) Cochin, 1987) LAKSHMANAPERUMALSAMY, P
    Non-symbiotic, free living, nitrogen fixing bacteria, Azotobacter sp. was estimated in sediments of estuarine, marine, backwater and mangrove environments of Portonovo. Number of colony forming units (CFU) of Azotobacter sp. was less (5 to 27 cells/g of dry sediment). CFU of total heterotrophic bacteria (THB), actinomycetes and fungi were between 4.1 x 106 and 4.5 x 107, 0.8 x 105 and 4.9 x 105, 1.1 x 105 and 3.8 x 105/g respectively. Mangrove sediments contained more CFU of the above microbial groups.
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    On the Occurrence of Mature Penaeid Prawn Penaeus merguensis in a Shallow Solar Salt works Reservoir its Spawning in Laboratory
    (Society of Fisheries Technologists (India) Cochin, 1987) GOPALAKRISHNAN, P; RAJU, V. KRISHNA; PILLAI, K. MADHUSUDHAN; THAKAR, SURESH J.
    Penaeus merguensis 1s so far reported to attain complete maturity and spawn in the sea or deep culture ponds only. Mature specimens of stage III to V collected from a shallow reservoir of solar saltworks were studied and spawned in laboratory. A comparison ot spawning of spawner from sea and reservoir is also reported
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    Relationship between Water, lipid and Protein in the Muscle,Liver and Gonad in a Freshwater Fish Puntius filamentosus (Val.)
    (Society of Fisheries Technologists (India) Cochin, 1987) VIJAYAKUMAR, B
    It was found that as the lipid and protem content gradually rose with the advancem_ent of maturity a corresponding decrease m water content ·was noticed in muscle, liver (female) and gonad of P. filamentosus.
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    Spoilage bacteria of Penaeus indicus
    (Society of Fisheries Technologists (India) Cochin, 1987) M, CHANDRASEKARAN; LAKSHMANAPERUMALSAMY, P; CHANDRAMOHAN, D
    Bacteria isolated from raw (untreated and unprocessed) prawn (Penaeus indicus) stored at 28±2°C, 4°C and-18°C were tested for spoilage potential, namely, production of protease, lipase, amylase, reduction of trimethylamineoxide (TMAO) to trimethylamine (TMA), production of off odours from flesh broth and halo zone around the colony grown on flesh agar. About 63 % of the total isolates tested were potential spoilers. Members of Vibrio, Pseudomonas and Acinetobacter were found to be dominant potential spoilers at all temperatures
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    Use of Simple Fat Analysis for Evaluating Quality changes in intermediate Moisture Fish stored at Tropical Temperature .
    (Society of Fisheries Technologists (India) Cochin, 1987) OBANU, ZAK A.
    Changes in the quality of intermediate moisture (IM) fish during storage at 38°C were monitored by assessing the moisture content, pH, acid value, peroxide value and thiobarbituric acid (TBA) value periodically. Results adequately portrayed the hydrolysis and peroxidation of fats and the concomitant protein degradation and cro.sslinking reactions that have been shown by more so.phisticated methods to. occur in intermediate moisture fish. Since these changes markedly affect the organoleptic quality, acceptability/shelf-life and nutritive value of IM flesh-foods their predictability by simple fat analytical techniques i::i of practical value where/ when the more sophisticated monitoring techniques are not feasible