Готові списки джерел за темами / Fish ponds Victoria Melbourne

Добірка наукової літератури з теми "Fish ponds Victoria Melbourne"

Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 28 січня 2023

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Статті в журналах з теми "Fish ponds Victoria Melbourne"

Grace, Asiyo Ssanyu, and Schagerl Michael. "Phytoplankton productivity in newly dug fish ponds within Lake Victoria wetlands (Uganda)." African Journal of Environmental Science and Technology 4, no. 6 (June 30, 2010): 365–70. http://dx.doi.org/10.5897/ajest09.210.

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Kaggwa, Rose C., Anne A. van Dam, John S. Balirwa, Frank Kansiime, and Patrick Denny. "Increasing fish production from wetlands at Lake Victoria, Uganda using organically manured seasonal wetland fish ponds." Wetlands Ecology and Management 17, no. 3 (June 29, 2008): 257–77. http://dx.doi.org/10.1007/s11273-008-9105-7.

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S.O., Ngodhe, Kerich E., Owuor O., and Mutai P. "A Comparative Study on the Selected Environmental Parameters Within the Cage, Pond and the Wild of Winam Gulf of L. Victoria." African Journal of Agriculture and Food Science 5, no. 1 (March 17, 2022): 44–53. http://dx.doi.org/10.52589/ajafs-obchmb8p.

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The main aim of this study was to compare the environmental variables between water inside the caged fish, open ponds and open waters of Winam Gulf. Selected water quality parameters from the 20 ponds, 30 cages and wild were measured in-situ using electronic meters. Water temperature, DO, pH and salinity did not differ significantly in the different study areas (p>0.05) while Total Dissolved Solids (TDS) registered a significant difference between the culture systems (pond and cage) and the wild (p<0.05). This was attributed to the fact that the study areas were all within the same geographical space and there was lack of variation in micro-climatic conditions during the study period, while the differences in TDS could be as a result of over fertilization of ponds, leading to algal bloom. The environmental variables were within the Food and Agricultural Organization (FAO) of the United Nations recommended limits for fish production.

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Ogutu-Ohwayo, Richard, and R. E. Hecky. "Fish Introductions in Africa and Some of Their implications." Canadian Journal of Fisheries and Aquatic Sciences 48, S1 (December 19, 1991): 8–12. http://dx.doi.org/10.1139/f91-299.

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Fish introductions in Africa have been made at various spatial scales from small fish ponds to the largest lakes, primarily to sustain or increase production, though some were to develop sport fisheries and to control unwanted organisms. Some introductions have fulfilled their objective in the short term, but several "successful" introductions have created uncertainties about their long-term sustainability. Lates niloticus, Oreochromis niloticus, O. leucostictus, Tilapia melanopleura and T. zilli were introduced into Lakes Victoria and Kyoga in 1950's and early 1960's; by the 1980's L. niloticus and O. niloticus dominated the fisheries, having virtually eliminated a number of endemic species. In Lake Victoria, the loss of genetic diversity has been accompanied by a loss of trophic diversity; the transformation of the fish community coincided with profound eutrophication (algal blooms, fish kills, hypolimnetic anoxia) which might be related to alterations of the lake's food-web structure. By contrast, the introduction of a planktivore, Limnothrissa miodon into Lake Kivu and the Kariba reservoir has established highly successful fisheries with little effect on the pre-existing fish community or trophic ecology. The endemic species-rich African Great Lakes may be particularly sensitive to introductions. Species extinctions, introgressive hybridization and ecosystem alterations may occur following introductions.

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Poltavchenko, T. V. "Стан захворюваності риби на бранхіомікоз та сапролегніоз у Рівненській області". Scientific Messenger of LNU of Veterinary Medicine and Biotechnologies 19, № 73 (9 січня 2017): 101–3. http://dx.doi.org/10.15421/nvlvet7321.

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Mycoses are dangerous because cause all ages fish (even spawn) of various species and lead to a large number of deaths – up to 70%. Micoses diseases caused by microscopic fungi belonging to several classes. The inhabitants of ponds parasites and mostly freshwater halophilic , opportunistic species out of the water and other substrates. Effective treatment of fungal infections has not yet been developed, so it is essential to carry out preventive veterinary-sanitary measures and create optimal conditions in ponds where fish are bred and grown. This article presents the epizootic situation analysis according such fish mycoses diseases of trout in fish industry in Rivne region in 2008–2015. Monitoring and control of these infections was fulfilled by the planned laboratorial experiments with given samples and fish industry epizootic investigations. Rivne state veterinary control over the 2008–2015 yy. was investigated epizootological state farms Rivne region on the state of disease in fish mycoses: saprolehniosis and branhiomyces. In 2008–2015 yy. investigated: PJSC «Rivnerybhosp» PJSC fish-meliorative station «Rivnenska» and «Alexandria» SVK «Victoria», enterprises of different ownership. Monitoring studies conducted by Rivne regional state veterinary laboratory in Rivne allow to prevent the spread and development of such dangerous mycoses as branchiomyces and saprolegniosis in time. According to reports of 2008–2015 yy. Rivne region is prosperous as for branchiomyces and unfavorable as for saprolegniosis (in 2009–2011 yy. some sporadic cases in pond farms were recorded).

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Kipkemboi, J., C. M. Kilonzi, A. A. van Dam, N. Kitaka, J. M. Mathooko, and P. Denny. "Enhancing the fish production potential of Lake Victoria papyrus wetlands, Kenya, using seasonal flood-dependent ponds." Wetlands Ecology and Management 18, no. 4 (April 3, 2010): 471–83. http://dx.doi.org/10.1007/s11273-010-9180-4.

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Hodgson, Brian, and Peter Paspaliaris. "Melbourne water's wastewater treatment lagoons: design modifications to reduce odours and enhance nutrient removal." Water Science and Technology 33, no. 7 (March 1, 1996): 157–64. http://dx.doi.org/10.2166/wst.1996.0134.

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Some properties of 3 “new style” wastewater treatment lagoons, 115E, 55E and 25W at the Melbourne Water, Western Treatment Plant (WTP) treating some 250 megalitres (ML) of untreated wastewater each day are described. There is a potential residence time for each of 120 days and each consists of a sequence of up to 11 ponds. Pond 1 has an anaerobic reactor of 90, 150, and 150 ML respectively and Warmens floating aerators are installed on ponds 1 and 2 of 115E and 25W and pond 1 of 55E. BOD5 values of less than 50 are achieved by the end of pond 2 and these together with the installation of the HDPE cover on 115E have effectively reduced odour emissions. Nitrogen is removed by ammonification followed by either nitrification/denitrification, or algal growth which is grazed by zooplankton. Since the introduction of the aerators, chemolithotrophic ammonia oxidising bacteria (CAOB) are more frequently exposed to the inhibitory action of UV light, and therefore nitrification is more sporadic. Turbidity of the water may play a significant role in protecting the CAOB from UV light. The lagoons have the potential to produce an effluent with inorganic-N levels of less than 2 mg/L, a BOD5 of less than 50 mg/L and low levels of algae. The covered anaerobic reactor can in each case produce up to 20,000 cubic metres of gas each day comprising of 80% methane. Methane will be used to generate electricity, and the zooplankton generated by feeding on algae will be harvested to provide food for fish fry.

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Gooley, GJ. "Validation of the use of Otoliths to determine the ate and growth of Murray Cod, Maccullochella peelii (Mitchell) (Percichthyidae), in Lake Charlegrark, Western Victoria." Marine and Freshwater Research 43, no. 5 (1992): 1091. http://dx.doi.org/10.1071/mf9921091.

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The age and growth of Murray cod, Maccullochella peelii, in Lake Charlegrark, western Victoria, were determined by using otoliths from fish sampled by beach-seine and gill-net, or caught by anglers, between August 1978 and August 1982. Annulus formation was validated up to 11 + years by several methods. Otoliths were examined from hatchery-bred fish of known age (up to 4+ years) that had been stocked into local farm ponds. Analysis of incremental growth for all fish sampled from the lake indicated that the mean edge-growth ratio was lowest, and the percentage of otoliths with an annulus at the edge was highest, in October. A nominal birth date of 1 October was designated for the population to enable calculation of the absolute age for each fish. Age-composition data for those fish taken by gill-net and by anglers (up to 21 + years) revealed modal progression of strong year classes (1970 to 1973 inclusive) during the sampling period. Length-frequency data for those fish taken by beach-seine (up to 3 + years) revealed modal progression, on a seasonal basis, of two relatively strong year classes (1978 and 1979) during the sampling period. A von Bertalanffy growth curve was fitted to length and age data for all fish collected in the lake (no sex difference, P>O.05), and growth parameters were estimated for the population (L∞ = 695 mm). This curve did not adequately describe the growth of fish older than 11 + years because the majority of sampled fish (98.3%) were aged 11 + years or younger. The length-weight relationship for the population was determined by using data from all fish collected in the lake (no sex difference, P>0.05).

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Kaggwa, Rose C., Anne A. Van Dam, Julius Kipkemboi, and Patrick Denny. "Evaluation of nitrogen cycling and fish production in seasonal ponds (‘Fingerponds’) in Lake Victoria wetlands, East Africa using a dynamic simulation model." Aquaculture Research 42, no. 1 (December 2010): 74–90. http://dx.doi.org/10.1111/j.1365-2109.2010.02563.x.

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Musa, Safina M., Christopher Mulanda Aura, Charles Chege Ngugi, and Rodrick Kundu. "The Effect of Three Different Feed Types on Growth Performance and Survival of African Catfish Fry (Clarias gariepinus) Reared in a Hatchery." ISRN Zoology 2012 (July 31, 2012): 1–6. http://dx.doi.org/10.5402/2012/861364.

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African catfish Clarias gariepinus is cultured as food fish, used to control overpopulation in tilapia ponds, and is grown as baitfish for the Lake Victoria Nile Perch fishery. Since the demand for Clarias gariepinus fingerlings is high, many farmers wish to specialize in fingerling production. In this study, the performance of three dietary feed types: freshwater rotifers with Artemia nauplii, freshwater rotifers with fish meal, and freshwater rotifers with maize bran, on the growth performance of African catfish fry, were done in a hatchery and they were raised in 9 glass tanks for a period of 21 days. Pearson’s correlation showed no relationship (r=0.1; P>0.05) between growth and water quality parameters, but indicated a strong relationship between survival rate and total length between treatments (r=0.85; P=0.02). Mean total length (TL) after 21 days were (A=15.003), (B=12.964), and (C=11.90) in mm for Treatments A, B, and C, respectively. Treatment A had the highest specific growth rate (SGR) of 6.475% day 1 followed by B (5.5320% day−1) and C (4.960% day−1). Results from this study demonstrate that after the 7 days of feeding using rotifers, Artemia is the best feed for increasing growth of Clarias gariepinus.

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