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  • 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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    Inshore demersal fisheries off Orissa coast (2021)
    In:  http://aquaticcommons.org/id/eprint/18073 | 12051 | 2015-10-01 15:55:39 | 18073 | Society of Fisheries Technologists, India
    Details
    Publication Date: 2021-07-05
    Description: Results of bottom trawling in inshore areas off Paradeep with reference to total catch composition and catch per unit effort during 1962-1978 are reported. With increase in fishing effort, benthic species recorded the highest catch in 1969-'70 and thereafter it fluctuated. Fluctuations till 1968-'69 may be due to seasonal migration of fishes. The decline after 1971-'72 can be attributed to overfishing. Off Mahanadi, Devi and Rushikulya river mouths, showed a north-south migration of fishes from october. Presently off Devi river mouth is a rich ground for demersal fishes.
    Keywords: Fisheries ; coastal fisheries ; coastal zone ; trawling ; fish catch statistics ; catch/effort ; fishing effort ; zoobenthos ; overfishing ; catch composition ; Devi River ; Paradeep ; Orissa ; India
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 101-107
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  • 4
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    Effect of electric stimulation on heart beat and body muscle in fish (2021)
    In:  http://aquaticcommons.org/id/eprint/18072 | 12051 | 2015-10-01 15:55:12 | 18072 | Society of Fisheries Technologists, India
    Details
    Publication Date: 2021-07-05
    Description: The effect of AC and DC electric stimulations on the heart-rate and the entire body of Heteropneustis fossillis, Tilapia mossambica and Macrobrachium rosenbergii were studied and presented in kymograph tracings. The reaction of spinal cord in Puntius ticto, Heteropneustis fossilis and Tilapia mossambica to D. C. field was observed to find out its role in electric shocks. A test-check of the electrical resistance of a few species was also conducted. The effect of D. C. and A.C. on the body muscle was found to be the same as that in the case of frog. Different degrees of cardiac slowing were observed in AC and DC. Unbalanced galvanotropic movements were also noticed in spinal fishes.
    Keywords: Biology ; physiology ; metabolism ; Heteropneustes fossilis ; Tilapia mossambica ; Macrobrachium rosenbergii ; Puntius ticto ; electric stimulations
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 91-99
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  • 5
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    On the response of Catla catla (Ham) and Cirrhinus mrigala (Ham) to the voltage gradient of electrical field (2021)
    In:  http://aquaticcommons.org/id/eprint/16314 | 12051 | 2015-03-28 15:01:31 | 16314 | Society of Fisheries Technologists, India
    Details
    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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  • 6
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    On the response of zooplankton in an electrical field (2021)
    In:  http://aquaticcommons.org/id/eprint/16313 | 12051 | 2015-03-28 15:02:06 | 16313 | Society of Fisheries Technologists, India
    Details
    Publication Date: 2021-07-03
    Description: Zooplankton showed directional movement towards thepositive electrode in an electrical field till the current continued to flow. Examination of the plankton 24 hours after their exposure for one minute to different current densities showed considerable mortality, the percentage of which was more in the case of the larger size groups.
    Keywords: Fisheries ; electrical fishing ; Daphnia magna ; zooplankton ; mortality ; electrical treatment
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 79-82
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  • 7
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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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  • 8
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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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  • 9
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    Preliminary observations of the use of under-water light in fish catch (2021)
    In:  http://aquaticcommons.org/id/eprint/18149 | 12051 | 2015-10-13 09:01:39 | 18149 | Society of Fisheries Technologists, India
    Details
    Publication Date: 2021-07-06
    Description: Experiments with drift gill net with under-water lights were carried out in the sea and estuarine region along with a control net of the same specifications without any light in the same fishing ground for comparison. The experimental net caught more fish in number and weight than the control. Fishes like pomfrets (Pampus chinensis, Parastromafeus niger), seer (Scomberomorus spp), hilsa (Ilisha spp) etc showed positive phototaxis and were gilled encircling the point of illumination. Young skates (Mobula spp) and Polynemus tetradactylus were antiphototactic. The number of fishes caught increased with increase in period of illumination. The catch of larger fishes was maximum at 60 mts of illumination and the total catch increased with increase in intensity of light. Additional cost of operation with under-water light was Rs 1-25 per hr but the catch was 4 to 5 times greater than that of the control net.
    Keywords: Fisheries ; illumination ; light effects ; fishing operations ; Pampus chenensis ; Parastromateus niger ; Scomperomorus spp. ; Ilisha spp. ; Mobula spp. ; Polynemus tetradactylus
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 42-47
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  • 10
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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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