FT Vol.23(2)

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    Cultural Conditions of Arylsulfatase Activity in Escherichia coli
    (Society of Fisheries Technologists (India) Cochin, 1986) DHEVENDARAN, K; CHANDRAMOHAN, D; NATARAJAN, R
    Arylsulfatase activity and growth were estimated in Escherichia coli, isolated from marine sediment. Maximum activity was observed at pH 6.6 whereas the maximum growth was at pH 5.6. 2 x 10-3 m M is the optimum substrate concentration for the highest level of enzyme activity/synthesis as well as for its growth. In general higher substrate concentration tended to inhibit enzyme activity and also the growth of the bacterium. Maximum growth and highest enzyme activity occurred at 29°C and above this temperature decreased both of them. Besides these, glucose, sodium sulfate, sodium chloride, sodium dihydrogen phosphate, sodium acetate and ammonium chloride at higher concentrations were inhibiting the enzyme activity and growth. Above 0.2% of glucose, 3% of sodium chloride, 10 x 10-3 M concentrations of sodium sulfate, sodium dihydrogen phosphate, sodium acetate and ammonium chloride inhibited the activity and growth also. These observations indicate that, to generalise a compound as inhibitor or activator it is difficult since this depends not only on its concentration but also on the source of the enzyme when more than one type is encountered in nature.
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    The Preservation of some Indian Freshwater Fish
    (Society of Fisheries Technologists (India) Cochin, 1986) DURAIRAJ, S; KRISHNAMURTHI, S
    Quality changes in Labeo rohita; Cirrhinus mrigala and Tilapia mossambica were studied during storage in ice and at ambient temperature (29-32°C). After 10 h at ambient temperature L. rohita and T. mossambica were completely spoiled, while C. mrigala became unacceptable within 11 h. Organoleptic examination, total volatile base nitrogen and total bacterial c:ounts showed that L. rohita (0.5 kg and above) and C. mrigala (0.5 kg and above) were acceptable upto 7 to 8 days of storage in ice in popular container (Bamboo basket) lined with palmyrah mat) at ambient temperature while T. mossambica (30-40 g) was acceptable upto 6 days. Influence of size of fish on shelf life in ice studied with reference to L. rohita showed that fishes below 500 g were acceptable upto 6 days of storage in ice in popular container at ambient temperature while those above 1000 g size were acceptable upto 8 days. Pro"Vision of an alkathene lining to the popular container extended the storage life of L. roh;ta from 6 days to 8 days. Pre-chilled and iced L. rohita had a longer shelflife (9 days) than merely iced sample (7 days)
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    Studies on the Toxicological effects of Asulox-40 and Emisan -6 to Eggs and Early Life History Stages of Sarotherodon mossambicus
    (Society of Fisheries Technologists (India) Cochin, 1986) PANDYA, S. S; RAO, K. S
    Toxicological effects of Asulox-40 and Emisan-6 to eggs and early life history stages of Sarotherodon mosst,;,mbicus were reported. 80% of egg hatching occurred in the controls, 1 p.p.m and 5 p.p.m concentrations of Asulox-40. 10 p.p.m. and 50 p.p.m. concentrations of the same toxicants had 70% and 60% hatchings while in Emisan-6 in the same concentrations the hatching were 70% and! 40%. Jn 100 p.p.m. concentration of both the toxicants 20% incomplete hatching occurred. In Emisan-6 Le 50 and Le 100 values were recorded at 32 hand 96 h respectively in 10 p.p.m. concentratior:s. In Asulox-40 the same valuc,s were recorded in 24 hand 40 h respectively at 50 p.p.m. concentration. The fish activity during the experimental period showed initial hyper aciivity. It was established that the Emisan-6 is more harmful to S. mossambicus than Asulox-40. The harmless concentrations of these chemicals were 1.2 p.p.m. for Asulox-40 and 0.6 p.p.m. for Emisan-6.
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    Filtration in some tropical Intertidal Bivalves Exposed to Mercury and Cadmium Mixtures
    (Society of Fisheries Technologists (India) Cochin, 1986) MOHAN, C. V; MENON, N. R; GUPTA, T.R.C
    Three species of intertidal filter feeding bivalves; M odiolus carvalhoi, M odiolus sp. and Donax spiculum, exposed to mercury and cadmium filtered significantly less volume of water under individual metal and metal mixture stress. Mercury and cadmium in mixtures interacted additively and more than additively (Synergism) in depressing the filtration rate of the bivalves
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    The Fecundity of the False Trevally,Lactarius lactarius (Bloch and schneider) along the Karwar Coast
    (Society of Fisheries Technologists (India) Cochin, 1986) NEELAKANTAN, B; KUSUMA, M. S; PAI, M. V
    A_ clear kno~l~dge of the reproductive potential or fecundity of a fish is quite an essential pre-requmte for the proper management andconservation of the resources. The fecundity studies are also undertaken to determine. the index of diversity dependent fact<;>r affecting. the population size (Simpson, 1951). Qasim & Qayyam (1963) have detailed ~he v~nous pathways by which an understanding of fecundity could be used for ~sh.ery biological work. The ability of egg production varies within the individual hm1ts such as length, somatic weight, gonadial weight, volume of fish ecc.