• Influence of ambient oxygen on random activity in some freshwater teleosts

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    • Keywords


      Random activity; ambient oxygen; hypoxia; Rhinomugil corsula ; Tilapia mossambica ; Puntius sarana ; Carassius auratus

    • Abstract


      The influence of ambient oxygen concentrations on random (spontaneous) activity was tested in four freshwater teleosts (mullet,Rhinomugil corsula, cichlid,Tilapia mossambica, minor carp,Puntius sarana and goldfish,Carassius auratus) at various ambient oxygen concentrations below air saturation at two temperatures 30 and 35° C. A modification of Fry’s respirometer and fish activity counter was used for the experiments. The initial ambient oxygen gradually fell from air saturation to reach the asphyxial level (the concentration at which the fish begin to lose equilibrium) by the depletion of oxygen due to the respiration of the fish itself. Among the four species tested, only inTilapia mossambica the random activity decreased with decrease in ambient oxygen whereas the other three species indicated a reverse trend. The differences in responses of random activity to ambient oxygen may be due to a dichotomy in behavioural evolution and may have a major role in the survival of the species.

    • Author Affiliations


      M Peer Mohamed1 M N Kutty2

      1. Central Inland Fisheries Research Substation, 24 Pannalal Road, Allahabad - 211 002, India
      2. Fisheries College, Tamil Nadu Agricultural University, Tuticorin - 628 003, India
    • Dates


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