FT Vol.25(2)

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    STUDIES ON CULTURAL CONDITIONS OF MARINE CHROMATIUM BRUDERI TRUPER AND JANNASCH 1968
    (Society of Fisheries Technologists (India) Cochin, 1988) DHEVENDARAN, K
    Photosynthetic characteristics of a purple sulfur bacterium, Chromataun buderi, cultured under different ranges of pH, temperature, light intensities and ammonium chloride concentrations were examined. Maximum bacteriochlorophyll a synthesis was observed at pH 6.5 whereas the optimum growth was at pH 8.0. In general, higher temperature tended to inhibit the chlorophyll a synthesis and growth. 30°C is the optimum temperature both for chlorophyll a synthesis and growth. At 25 tIE m —25 the bacteriochlorophyll a content and growth attained maximum level. The response to this low light intensity is an adaptation that ensure a high photosynthetic rate for the purple sulfur bacterium that usually occurs in dimly lit environment. Besides these, ammonium chloride at low concentration enhances both chlorophyll a sy thesis and growth. Above 0.5 % of it cause the nitrogen-chlorosis and also retard the growth of the bacterium. Possible chemical and structural mechanisms involved are discussed.
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    TWO NEW RECORDS OF PALAEMONID PRAWNS FROM INDIAN WATERS
    (Society of Fisheries Technologists (India) Cochin, 1988) JAYACHANDRAN, K. V; JOSEPH, N. I
    descriptions with suitable illustrations of two species of palaemonid prawns — Macrobrachiu;n aernuluin and Palaemon (Palaemon) concinnus are furnished. M. aemulum has been enjoying an isolated distribution in New Caledonia. It is reported for the first time from India and is therefore a clear case of discontinuous distribution. Studies revealed that M. aemulum is distinct from M. nob ilii and the reasons for separating the two species are discussed. New distributional records for P. (P.) concinnus in the south-west coast of India are also given.
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    Length Weight relationship of two Palaemonid Prawns,Macrobrachium idella and M. scabriculum- A comparative study
    (Society of Fisheries Technologists (India) Cochin, 1988) JAYACHANDRAN, K. V; JOSEPH, N. I
    Length-weight relationships of two commercially important freshwater prawns, Macrobrachium idella and M. scabriculum, have been worked out separately for the two sexes of the two species. 't' test showed that growth departs significantly from the isometric growth in the case of both sexes of M. idella and in the female of M. scarbriculum. Therefs re, the cubic formula W = CL 3 may be applied only in the case of males of M. scabriculum. In all the other cases W = CLD may be followed.
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    Fabrication of a Water Sampler for Use in AquacuIture
    (Society of Fisheries Technologists (India) Cochin, 1988) SAHA, C; BOSE, A. N
    This sampler is light and handy and is useful for field and laboratory model studies. Since aluminium angle is used this is not affected by rusting due to repeated use in water. This simple equipment is easy to fabricate and operate. In Kemmerer type samplers, the sample is transferred from the sampler to the sample bottle for estimation of dissolved gases. But in the present sampler there is an additional advantage of collecting the sample directly in the sample bottle.