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  • Cyprinus carpio  (6)
  • 2020-2022  (6)
  • 1970-1974
  • 1965-1969
  • 1940-1944
Collection
Keywords
Years
  • 2020-2022  (6)
  • 1970-1974
  • 1965-1969
  • 1940-1944
Year
  • 1
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    On the effect of electrical field on Indian carps in captivity (2021)
    In:  http://aquaticcommons.org/id/eprint/16315 | 12051 | 2015-03-28 15:00:53 | 16315 | Society of Fisheries Technologists, India
    Details
    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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    Preliminary observations on the effect of electrical seine on fish catch (2021)
    In:  http://aquaticcommons.org/id/eprint/16497 | 12051 | 2015-03-27 09:01:20 | 16497 | Society of Fisheries Technologists, India
    Details
    Publication Date: 2021-07-06
    Description: Forty-six experiments were done with the electric seine in 24 tanks with a.c. and interrupted a.c. The source of electrical energy was a 3 Kw a.c. generator of water-cooled diesel engine. A control seining without applying electricity was conducted for every experiment with electric "seine" to have a comparison for the efficiency of electric "seine" over control ones. Electric seine was found to have an increased catch over control seining both in numbers and in weight. Electric seine with two electrodes was found to have better effect over three electrodes. Benthic fishes like Cirrhina mrigala, Notopterus notopterus, Cyprinus carpio, Glassogobius giuris, Ophicephalus sp. and Mystus sp. were found to be more sensitive in electric "seine". Increased catch of small fishes like C. mrigala, N, notopterus and Ophicephalus sp. has been observed in electrical "seine" in addition to larger ones.
    Keywords: Fisheries ; electric fishing ; alternating current ; Cirrhina mrigala ; Notopterus notopterus ; Cyprinus carpio ; Glassogobius giuri ; Ophicephalus sp. ; Mystus sp.
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 198-206
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  • 3
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    Determination of threshold current densities for different reactions of fishes using a pantostat (2021)
    In:  http://aquaticcommons.org/id/eprint/18147 | 12051 | 2015-10-13 09:01:04 | 18147 | Society of Fisheries Technologists, India
    Details
    Publication Date: 2021-07-05
    Description: The threshold current densities required for first reaction, galvanotaxis and galvanonarcosis of fish depended upon species, length of the body, conductivity of water, nature of current and frequency of impulses. The threshold values and their ratios decreased with increase in length of fish. With rise in conductivity of water in the ratio of 1:4:13, these values increased in the ratio 1: 2:5. Impulse D. C was superior to continuous D. C and the threshold values of current densities for different reactions of fish decreased with rise in impulse frequency reaching minimum at an impulse frequency of 48/sec. Among Salmo irideus, ldus melanotus and Cyprinus carpio, the first one was affected earlier and required minimum current densities to exhibit the reactions, while the last one showed similar reactions only at higher current densities.
    Keywords: Fisheries ; electric fishing ; current density ; capture efficiency ; Salmo irideus ; Idus melanotus ; Cyprinus carpio
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 27-36
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  • 4
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    Studies on threshold current densities for convulsion of fish using a square wave stimulator (2021)
    In:  http://aquaticcommons.org/id/eprint/18164 | 12051 | 2015-10-13 09:26:01 | 18164 | Society of Fisheries Technologists, India
    Details
    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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  • 5
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    A new observation on large scale disintegration of eggs of Indian major carps during development (2021)
    In:  http://aquaticcommons.org/id/eprint/18194 | 12051 | 2015-10-14 05:23:03 | 18194 | Society of Fisheries Technologists, India
    Details
    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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  • 6
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    On the selection of effective impulse frequencies for specific movements of fish in an electrical field (2021)
    In:  http://aquaticcommons.org/id/eprint/18163 | 12051 | 2015-10-13 09:25:10 | 18163 | Society of Fisheries Technologists, India
    Details
    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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