1990

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Browsing 1990 by Author "NEELAKANTAN, B"

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    Comparative Toxicity of Four Detergents on a Prawn Metapenaeus dobsoni (Miers)
    (Society of Fisheries Technologists (India) Cochin, 1990) SAKUNTHALA, B; SHANMUKHAPPA, H; NEELAKANTAN, B
    The toxicity bioassay experiment was conducted using four detergents, namely, linear alkylbenzene sulfonate (LAS), branched alkylbenzene sulfonate (BAS), alfa olefin sulfonate (AOS) and sodium sulfonate (SS.) 0.1 Metapenaeus dobsoni juveniles. The results indicated that, LAS was most toxic and AOS the least and were in the order: LAS>SS. >BAS>AOS. The LCN, LC50 and LC84 concentrations for all the detergents were calculated for 24, 48, 72 and 96 hours. The 95 % confidence limits for LC50 and slopes were also calculated by probit analysis.
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    Plankton of Karwar Waters with Remarks on the Hydrographic Conditions and Fishery
    (Society of Fisheries Technologists (India) Cochin, 1990) NAIK, U. G; REDDY, C. R; SHETTY, D. C; NEELAKANTAN, B
    The results obtained from the investigations on the abundance and seasonal Huctuations of plar k‘on and hydrographic condiiions of fishing areas cf Karwar waters are pres :nted and discussed. The displacement volume of plankton (9.2~29.6 ml/m’) showed two peaks one in November-December and other in February-March. Among the phytoplankton, the diatoms constitute the major part of the total phytoplankton with dominant species like Fragillaria, Coscinodiscus, Thalassiothrix, Chaetoceros, Nirzschina, Rhizosolenia and Biddulphia whereas among the zoopl;nktons, the dominant groups mainly comprised of` copepods, decapod larvae, chaetognaths and medusae. The observed valuis ofhydrographic parameter showed a birnodil peak. A correlation between plankton abundance and fishery has been attempted in this paper.
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    Size at Maturity in the Male Crab Scylla serrata as Determined by Chela Allometry and Gonad Condition
    (Society of Fisheries Technologists (India) Cochin, 1990) PRASAD, P. N; NEELAKANTAN, B
    Sexual maturity in the male mud crab, Scylla serraza attains at the size range 81-90 mm carapace width (CW). At 97 mm CW 50% of males are mature. Highly significant (P < 0.00l) relationships are obtained between chela allometry and carapace measurements. About 34% of male crabs harvested commercially from the Karwar area during December, 1984 and November, 1985 were immature.