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  • 1
    Electronic Resource
    Electronic Resource
    Nitrogen processing and retention in Hungarian carp farms (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of applied ichthyology 10 (1994), S. 0 
    Details
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Based upon a detailed study carried out 20 years ao on the sediment nitrogen content in the commercial carp ponds of Horvȧthpuszta intensive farm and upon the reexamination of the same 19 ponds, we found an average annual rate of nitrogen accumulation of 174 pg N g-' dry sediment. Nitrogen budgeting for the 20 years (1970–1990) was completed for input nitrogen sources of inorganic fertilization, duck feed, fish feed, manure, atmosphere deposition, filling water and nitrogen fixation, as well as for output sources of alfalfa, fish, rice, duck yield, drainage water and denitrification. The average annual nitrogen retention of 93 kg ha-1 corresponded well to the 174 μg Ng-1 measured value of nitrogen accumulation. During the 20 years of nitrogen accumulation on industrialized agricultural land of Hungary, the intensive fish farm received altogether 1246 tonnes of nitrogen and released only 686 tonnes to the environment. Therefore removing, processing and accumulating most of the available nitrogen while minimizing the pollution to the environment is one of the challenges for the future for both aquacultural and agricultural activities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0426.1994.tb00174.x
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    Paper (German National Licenses)
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  • 2
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    Kinetic Study of Photocatalytic Degradation of Tolonium Chloride Under High Pressure Irradiation in Aquatic Buffer Systems (2011)
    Hindawi
    Details
    Publication Date: 2011-01-01
    Description: Anatase titanium dioxide catalyzed photodegradation of tolonium chloride at various bufferic pH of 2, 7, 9 and 12 in aqueous solution is presented. The effect of some physicochemical parameters such as initial concentration of dye, catalyst amount and reaction time on photocatalytic degradation has been investigated in a photo-reactor cell containing high pressure mercury lamp to obtain the optimum conditions in each bufferic pH at constant temperature. A complete spectrophotometric kinetic study of tolonium chloride under high pressure irradiation at buffer media was performed. The photocatalytic degradation observed rate constants (kobs) were found to be 2.90×10-3, 3.30×10-3, 3.20×10-3and 5.20×10-3min-1for buffer pH of 2-12 respectively. It was found that a pseudo-first-order kinetic model based on Langmuir-Hinshelwood one is usable to photodegradation of this compound at all considered buffer pH. In addition to these, the Langmuir-Hinshelwood rate constants, krfor the titled compound at various pH are reported.
    Electronic ISSN: 0973-4945
    Topics: Chemistry and Pharmacology
    Published by Hindawi
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  • 3
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    Feeding characteristics of Neogobis caspius in the south west coastline of the Caspian Sea (Gilan Province) (2018)
    Details
    Publication Date: 2021-05-19
    Description: Neogobius caspius is an endemic species of the Caspian Sea which plays an important role in food chain as a predatory fish. The main aim of this study was to investigate selected feeding characteristics of Neogobius caspius in the south west coasts of the Caspian Sea. Monthly sampling was carried out using a bottom trawler at three stations (Astara, Anzali and Chabuksar) in three depths (0-5, 5-10 and 10-15m) on a monthly basis from October 2004 to September 2005. Relative gut length (RLG) was less than one suggesting that this species is carnivorous. RLG was significantly lower in older fish but gut length was longer (P〈0.05). I ntensity of fullness was below the favorite degree (IF〈400) from October to March, however, it was higher (400N. caspius mainly fed on molluscs (Food preference, FP=100%), worms (FP=89%) and crustaceans (FP=74%), hence, this species is considered as euryphagus species.
    Description: Published
    Keywords: Caspius ; Feeding characteristics ; Relative gut length ; Food preference
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.127-140
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  • 4
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    Effect of different salinity on ions, osmolarity, water concentration of body tissue, gill chloride cells and mortality percentage of juveniles of Caspian roach (Rutilus frisii kutum Kamensky 1901) (2021)
    In:  http://aquaticcommons.org/id/eprint/23861 | 18721 | 2018-08-01 05:01:05 | 23861 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    Description: Changes of ions (Na+, Ca, K+), osmolarity and water concentration of body tissue, size and number of gill chloride cells as well as mortality percentage of the juveniles Caspian roaches in weight groups of 0.2, 0.5 & 1g water satiny stress were studied. The salinities tested were 0 (fresh water), 7, 12.5 & 16 g/lit and the assessments were completed 0, 12, 24, 48 & 72 hours after exposure. Results showed that ions and osmolarity of juveniles weighting 0.2 & 0.5g in salinities of 0 up to 12.5g/lit increased significantly during the first 12 hours (P'〈0.05). These values then showed down were trend to the values recorded for fresh water. Water concentration of body tissue reached the minimum mean value in 12 hours (P〈0.05) in salinity of 12.5 g/lit and then showed upward trend to the value obtained for freshwater. Ions and osmolarity of body tissue of the juveniles increased and water concentration of body tissue decreased significant after the first 12 hours of transferring into salinity of 16g/lit (P〈0.05). Weight changes in juveniles of 1g in salinities of 0 up to 16g/lit was similar to juveniles of 0.2 & 0.5g in salinities of 0 up to 12.5gllit and the maximum mean values of ions and osmolarity and the minimum value of water concentration body tissue in 16g/lit salinity in hour 12 (P〈0.05). Size and number of gill chloride cells of juveniles weighting 0.2 & 0.5g in salinities of 0 up to 12.5g/lit increased significantly during the first 12 hours of exposure (P〈0.05) and reached the maximum mean values in 12.5g/lit salinity 12 & 24 hours after exposure, respectively (P〈0.05) and showed invisible changes up to the end of the test. Size and number of chloride cells of the juveniles increased after the first 12 hours of transferring into salinity of 16g/lit (P〈0.05). Changes of the indices in juveniles weighting 1gin salinities of 0 up to 16g/lit was similar to juveniles of 0.2 & 0.5g kept in salinities of 0 up to 12.5gtlit and the maximum values was in 12 and 24 hours after exposure, respectively (P〈0.05). Ions and osmolarity of body tissue and size and number of chloride cells increased significantly with increase of salinity and weight and water salinity and water concentration of body tissue decreased significantly with increase in water salinity and increased in fish weight (P〈0.05). Juveniles weighting 0.2 up to 1g showed no mortality in salinities of 0 & 7g/lit during t- test. Mortality of the juveniles weighting 0.2, 0.5 and 1g/1it increased during the first 12 hours and became constant to the end of the test. Mortality of juveniles weighting 0.2 & 0.5g in salinity of 16g/lit was similar to that of the juveniles weighting 0.2 & 0.5g in salinity of 12.5g/lit. Mortality of the juveniles increased significantly with increase of salinity and decreased with increase of weight (P〈0.05).
    Keywords: Biology ; Osmoregulation ; Osmolarity ; Ion ; Chloride cell ; Rutilus frisii kutum ; Weight ; Salinity ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 115-130
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  • 5
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    Effect of different salinity on ions, osmolarity, water concentration of body tissue, gill chloride cells and mortality percentage of juveniles of Caspian roach (Rutilus frisii kutum Kamensky 1901) (2018)
    Details
    Publication Date: 2021-05-19
    Description: Changes of ions (Na+, cr, K+), osmolarity and water concentration of body tissue, size and number of gill chloride cells as well as mortality percentage of the juveniles Caspian roaches in weight groups of0.2, 0.5 & 1g water satiny stress were studied. The salinities tested were 0 (fesh water), 7, 12.5 & 16g/lit and the assessments were completed 0, 12, 24, 48 & 72 hours after exposure. Results showed that ions and osmolarity of juveniles weighting 0.2 & 0.5g in salinities of 0 up to 12.5g/lit increased significantly during the first 12 hours (P'〈0.05). These values then showed downwara trend to the values recorded for fresh water. Water concentration of body tissue reached the minimum mean value in 12 hours (P〈0.05) in salinity of 12.5 g/lit and then showed upward trend to the value obtained for freshwater. Ions and osmolarity of body tissue of the juveniles mcreased and water concentration of body tissue decreased significant after the first 12 hours of transferring into salinity of 16g/lit (P〈0.05). Weight changes in juveniles of 1g in salinities of 0 up to 16g/lit was similar to juveniles of 0.2 & 0.5g in salinities of 0 up to 12.5gllit and the maximum mean vafues of ions and osmolarity and the minimum value of water concentration body tissue in 16g/lit salinity in hour 12 (P〈0.05). Size and number of gill chloride cells of juveniles weighting 0.2 & 0.5g in salinities of 0 up to 12.5g/lit increased significantly during the first 12 hours of exposure (P〈0.05) and reached the maximum mean values in 12.5g/lit salinity 12 & 24 hours after exposure, respectively (P〈0.05) and showed invisible changes up to the end of the test. Size and number of choride cells of the juveniles increased after the first 12 hours of transferring into salinity of 16g/lit (P〈0.05). Changes of the indices in juveniles weighting 1gin salinities of 0 up to 16g/lit was similar to juveniles of 0.2 & 0.5g kept in salinities of 0 up to 12.5gtlit and the maximum values was in 12 and 24 hours after exposure, respectively (P〈0.05). Ions and osmolarity of body tissue and size and number of chloride cells increased significantly with increase of salinity and wetght and water salinity and water concentration of body tissue decreased significantly with mcrease in water salinity and increased in fish weight (P〈0.05). Juveniles weighting 0.2 up to 1g showed no mortality in salimties of 0 & 7g/lit during tfie test. Mortality of the juveniles weighting 0.2, 0.5 and 1g/1it increased during the first f2 hours and became constant to the end of the test. Mortality of juvenTies weighting 0.2 & 0.5g in salinity of 16gllit was similar to that of the juveniles weighting 0.2 & 0.5f in salimty of 12.5g/lit. Mortality of the JUVeniles increased significantly with increase of salinity and decreased with increase of weight (P〈0.05).
    Description: Published
    Keywords: Rutilusfrisii kutum ; Caspian roach ; Osmoregulation ; Osmolarity ; Ion ; Chloride cell ; Weight ; Salinity ; Tissues ; Gill ; Juvenile
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.115-130
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