1998

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Browsing 1998 by Author "Kurup, B. Madhusoodana"

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    Biochemical Characterisation of Different Male Morphotypes of Macrohrachium rosenbergii (De Man)
    (Society of Fisheries Technologists (India)Cochin, 1998) Sureshkumar, S; Kurup, B. Madhusoodana
    Protein, carbohydrate, lipid, DNA and RNA contents were studied in the muscle tissue, hepatopancreas and gonads of male morphotypes of M. rosenbergii viz. small males (SM), orange clawed males (OC) and blue clawed males (BC) and their transitional stages, weak orange clawed (WOC) and strong orange clawed (SOC). Significant difference could be seen in protein, DNA and RNA contents of muscle tissue, carbohydrate and RNA contents in hepatopancreas and DNA and RNA contents of the gonads of various male morphotypes. Highest protein content in muscle was recorded for SOC (19.10%) and minimum for WBC (17.71%) and OBC (17.52%). Highest values of RNA (1.020 mg/g) and DNA (0.68mg/g) of muscle tissue was also recorded in SOC. Carbohydrate content (2.37%) and RNA (0.744 mg/g) content of hepatopancreas were also found to be high in SOC when compared to other male morphotypes. In gonads highest DNA content (0.891 mg/g) was observed in OBC whereas RNA content was maximum in SBC (1.159 mg/g). Results of the present study would be useful in providing biochemical evidence for the existence of morphotypes in male populations of M. rosenbergii
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    Population Dynamics of an Indigenous Carp (Labeo dussutnieri) of the River Pampa, Kerala (India)
    (Society of Fisheries Technologists (India)Cochin, 1998) Kurup, B. Madhusoodana
    Based on length composition of commercial landings of Labeo dussumieri of the river Pampa, growth parameters, La and K were estimated using ELEFAN I programme as 464.7 mm and 0.64/anmm\ respectively in male and 502 mm and 0.81/ annum in female. Average instantaneous rates of mortality Z, M and F in male were respectively 1.4305, 0.8595 and 0.5710 while in females the above values were 2.3348, 1.0863 and 1.2485. From the length converted cohort analysis, F was estimated to be 0.5709 in male against 1.2484 in female. The results of the present study showed that males of L dussumieri of the river Pampa are harvested below the optimum level while the females are exploited at optimum level and therefore, it is concluded that the stock of this species can be maintained at a sustainable level at the present level of exploitation.