FT Vol.21(1)

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    ACUTE TOXICITY OF CADMIUM TO SIX INTERTIDAL INVERTIBRATES
    (Society of Fisheries Technologists (India) Cochin, 1984) MOHAN, C. V; MENON, N. R; GUPTA, T.R.C
    Following a static bioassay techniques the acute toxicity of cadmium to six species of intertidal invertebrates was determined. The sensitivity of the animals to cadmium was of the following order. Emerita sp. (burrowing crustacean) Donax spiculum (burrowing bivalve) Perna viridis (sedentary bivalve) Sabellaria clandestinus(tube-dwelling polychaete) Modiolus carvalhoi and Modiolus sp. (sedentary bivalves). The above observation was based on the median lethal concentrations recorded for the different species, Emerita sp. 1.35 p.p.m., Donax spiculum 1.8 p.p.m., Perna viridis 2.5 p.p.m., Sabellaria clandestinus 2.8 p.p.m., Modiolus carvalhoi 5.6 p.p.m. and Modiolus. sp. 9.6 p.p.m. The findings throw insight into the toxicity of cadmium to the common intertidal animals which are either suspension or detritus feeders.
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    ARYLSALFATASE ACTIVITY IN MARINE POLYCHAETES
    (Society of Fisheries Technologists (India) Cochin, 1984) DHEVENDARAN, K
    Marine polychaetes, collected from the Vellar Estuary exhibited arylsulfatase activity. Lumbriconeries sp. Polydora sp. M onojis sp. and H eteromastus sp. were selected for this study. Of these, Heteromastus sp. showed maximum enzymatic activity and it has been chosen for the enzyme kinetic studies such as pH, optimal temperature, period of incubation and the effect of DDT. Enzyme activity showed single peak at pH 6.2 possibly indicating the presence of one type of arylsulfatase. Maxim.'Jm activity was attained after 12 h of incubation at 29°C. DDT has an inhibiting effect on the arylsulfatase activity even at the concentration of 10 p.p.m. and the activity was completely lost at 100 p.p.m.
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    DENATURATION OF LABEO ROHITHA (ROHU) ACTOMYOSIN ON FROZEN STORAGE PREVENTIVE EFFECT OF DI CARBOXYLIC ACID
    (Society of Fisheries Technologists (India) Cochin, 1984) RAO, S. B
    The preventive effect of fumarate, maleate, tartrate and oxalate on the denaturation of frozen rohu actomyosin at-20oC in 0. 7 M KC1 for 7 weeks was examined using an in vitro test model. The rate of denaturation was followed by estimating percentage salt extractability, Ca2 + ATP-ase activity and the clearing response test. Fumarate, maleate and tartrate showed cryoprotective effect for higher concentration of pre-rigor rohu actomyosin of 10 mg/ml and 20 mg/ml. At actomyosin concentration of 6 mg/ml, maleate and tartrate showed some preventive effect whereas fumarate enhanced denaturation. Oxalate showed poor cryoprotective action. Post-rigor rohu actomyosin was preserved frozen without denaturation to a greater extent than pre-rigor actomyosin.
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    THE GIERSTAD KILN A COMBINED HOT AND COLD SMOKING KILN
    (Society of Fisheries Technologists (India) Cochin, 1984) GJERSTAD, DAG
    A combined hot and cold smoking kiln has been constructed for use at Lake Turkana, Kenya. Used for cold smoking, the kiln's main advantages over the traditional kilns used in this area are its greater smoking capacity and lower firewood consumption. Having the option of using the same smoke house for cold and hot smoking reduces the total construction costs for an operator producing both types of smoke cured product. The hot smoking process was found to require markedly less firewood than cold smoking, a fact of considerable importance in desert or semi-desert areas with sparse vegetation.
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    Study on the Quality of Beebe-de-mer in Trade and Shrinkage of Specimens During Processing
    (Society of Fisheries Technologists (India) Cochin, 1984) Durairaj, S; Nainar, M.Mohamad; Laine, M.Kingsly; Sudhakaran, R; Inbaraj, S
    The beche-de-mer industry in India is a cent percent export oriented industry being confined to south east coast in Palk Bay and Gulf of Mannar in Tamilnadu. Chemical quality of 180 trade samples of beche-de-mer of four sizes collected from the beche-demer curing centres of Ramanathapuram district was studied. Moisture ranged from 6.2 to 24.4% and sand content from 0.11 to 20.42% for all grades. Mean values of sand content are for grade 1=3.47%, grade 2=4.50%, grade 3=3.68%, grade 4=6.87%. Sodium chloride was almost constant for all grades at 5.7~~. TV BN values ranged from 10 to 78.4 mg%. 44 laboratory samples of different grades were prepared following trade practice and examined for chemical quality. Mean moisture values are for grade 1=13.4%, grade 2=12.44%, grade 3= 1262% grade 4= 12.08% and mean values of sand are for grade 1=0.70%, grade 2=0.90%, grade 3= 1.16%, grade 4=2.15%. The percentage of shrinkage of the animals ranged from 56% to 60% for dried beche-demer of 7.5 cm size and above.
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    Vertical Distribution of Marine Wood Boring and Fouling Organisms from the Estuarine Areas of the South West Coast of India
    (Society of Fisheries Technologists (India) Cochin, 1984) SANTHAKUMARI, V; NAIR, N. BALAKRISHNAN
    Vertical distribution of marine wood boring and fouling organisms from three different estuarine areas namely, the Ernakulam channel in the Cochin Backwaters, Ayiramthengu in the Kayamkulam Lake and Neendakara in the Asthamudi Lake during the post-monsoon, the pre-monsoon and the monsoon periods is presented. The boring organisms noticed during the present study were Martesia striata, Teredo furcifera, Nausitora hedleyi and Sphaeroma terebrans. The dominant fouling organisms were Balanus amphitrite amphitrite, calcareous worms and Modiolus sp. Algae and diatoms were very common on the sub-tidal panels during the monsoon. The incidence of Teredo, Nausitora and calcareous tube worms were significantly high on the bottom panels. Sphaeroma, Balanus and Modiolus occurred in greater numbers on the intertidal panels