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  • Catla catla  (3)
  • Gasterosteus aculeatus  (2)
  • 2020-2022  (5)
  • 1945-1949
Collection
Years
  • 2020-2022  (5)
  • 1945-1949
Year
  • 1
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    In:  http://aquaticcommons.org/id/eprint/16315 | 12051 | 2015-03-28 15:00:53 | 16315 | Society of Fisheries Technologists, India
    Publication Date: 2021-07-03
    Description: Threshold current densities required for narcosis of fish in captivity differed in different species. Increased temperature of the water had greater effect on the fishes while changes of pH had no appreciable effect on narcosis in the fishes. Impulse currents of 50 V were found to have better effect on the fishes than continuous current of 180-220 V.
    Keywords: Fisheries ; electrical fishing ; Catla catla ; Labeo rohila ; Cirrhina mrigala ; Labeo calbasu ; Cirrhina reba ; Cyprinus carpio ; narcosis ; electrical treatment
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 91-97
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  • 2
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    In:  http://aquaticcommons.org/id/eprint/16314 | 12051 | 2015-03-28 15:01:31 | 16314 | Society of Fisheries Technologists, India
    Publication Date: 2021-07-03
    Description: The threshold body voltage (voltage gradient between head and tail) required for first reaction, electro-taxis and electro-narcosis depended upon species, conductivity of the fish body, nature of current and wave shape. Larger fishes showed first reaction at a lower body voltage than smaller ones. All the three reactions were dependent on the accommodation of nerves to the electrical field and subsequent fatigue of the fishes. No significant change was observed in the period of narcosis and recovery after repeated stimulation.
    Keywords: Fisheries ; electrical fishing ; Catla catla ; Cirrhinus mrigala ; electro-narcosis ; electro-taxis ; electrical treatment
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 83-90
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  • 3
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    In:  http://aquaticcommons.org/id/eprint/18164 | 12051 | 2015-10-13 09:26:01 | 18164 | Society of Fisheries Technologists, India
    Publication Date: 2021-07-06
    Description: The threshold current densities and voltage tensions (body voltages) between the head and tail for bringing about distinct reactions in Salmo irideus, Cyprinus Carpio, Tinea tinca, Gasterosteus aculeatus and Salmo fario were studied. In C. carpio and T. tinca, absolute current densities required decreased with increase in length of fish. Threshold current densities for different reactions of fish increased with rise in water temperature and conductivity of surrounding medium except in case of T. tinca where low current densities were sufficient in higher conductivity of water. Impulse D.C. was superior to continuous D.C. Better effect was noticed in fishes in lower current densities when their bodies were parallel to the lines of current conduction.
    Keywords: Fisheries ; Salmo irideus ; Cyprinus carpio ; Gasterosteus aculeatus ; Tinca tinca ; Salmo fario ; electric fishing ; electronic impulse transmitter
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 143-155
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  • 4
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    In:  http://aquaticcommons.org/id/eprint/18194 | 12051 | 2015-10-14 05:23:03 | 18194 | Society of Fisheries Technologists, India
    Publication Date: 2021-07-06
    Description: While carp themselves may destroy carp eggs by sucking from outside the happa, destruction in the absence of carp also occurs. During observations of the effect of electrical field on developing carp eggs it was seen that the egg membrane ruptured prematurely under certain potential differences. In natural waters and mud potential differences occur in the presence of high concentrations of certain salts compared with the internal concentration. Temperature and pH fluctuations following strong sun or heavy rain accelerates the diffusion of ions along side water through the egg membrane. The egg cells expand rapidly and the embryos were rapidly dropped.
    Keywords: Aquaculture ; Biology ; Cyprinus carpio ; Labeo rohita ; Cirhina mrigala ; Catla catla ; eggs ; induced breeding ; develpoment
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 83-84
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  • 5
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    In:  http://aquaticcommons.org/id/eprint/18163 | 12051 | 2015-10-13 09:25:10 | 18163 | Society of Fisheries Technologists, India
    Publication Date: 2021-07-06
    Description: In order to determine effective pulse limits for Salmo irideus, Cyprinus carpio, Gasterosteus aculeatus, Tinca tinca, Salmo fario and ldus melanotus in impulse D. C. for galvanotaxis and galvanonarcosis, studies were carried out with rectangular and square impulses. The narcotizing pulse limits remained constant for each variety in an impulse D. C. of specific wave form. The anodic effect of fishes was better in square wave form and varied with the variation of temperature of surrounding medium. S. fario reacted better when placed parallel to the lines of electrical force. Transversal escape movement occured when the axis of fish body was at right angles to the direction of current.
    Keywords: Fisheries ; Salmo irideus ; Cyprinus carpio ; Gasterosteus aculeatus ; Tinca tinca ; Salmo fario ; ldus melanotus ; electric fishing ; electrical fishing gears
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 133-142
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