Comparison of systems of biological indication approved during the course of the joint Anglo-Soviet investigations held under the auspices of the Institute of Hydrobiology of the Academy of Sciences of the Ukrainian SSR

In accordance with the plan for joint Anglo-Soviet scientific and technical collaboration on environmental problems, the comparative evaluation of systems of hydrobiological analysis of the surface water quality started in 1977 at the Regional Laboratory of the Severn-Trent Water Authority in Nottingham were continued in the spring of 1978. The investigations were carried out under the auspices of the Institute of Hydrobiology of the Academy of Sciences of the Ukrainian SSR. Hydrobiological and hydrochemical samples were collected by Soviet and British specialists from the Kiev reservoir and the rivers Dnieper, Sozh, Desna and Snov. The samples were processed on the expedition ships and in the Laboratory for the Hydrobiology of Small Water Bodies of the Institute of Hydrobiology of the Academy of Sciences of the Ukrainian SSR. The possible approved methods to be adopted were evaluated from the samples using the phytoperiphyton, phytoplankton, zooplankton and zoobenthos against a background of hydrochemical characteristics. The study concludes that weather conditions complicated the work on testing the systems of biological indication of water quality and made it inadvisable to use those methods of comparison which were used when similar work was carried out in Nottingham

Africa: the FBA connection

Since its inception in the 1930's the Freshwater Biological Association at Windermere, England has been involved in research on African lakes and rivers. Research has included general and multidisciplinary surveys of many lakes including Lake Victoria, Lake Tanganyika, Lake Nyasa (Lake Malawi) and Lake George. The hydrobiology of the River Nile has also been studied. Research into physical and chemical limnology, phytoplankton ecology and primary productivity, invertebrate biology, freshwater fish and fisheries

Short Time Variation of Temperature in Lake Mendota, Wisconsin

Author Institution: F. T. Stone Institute of Hydrobiology, Put-in-Bay, Ohio, and Department of Meteorology, University of Wisconsin, Madiso

Estimation of the Gaseous Co. Concentration in Intercellular Spaces During Photosynthesis

Author Institution: The Franz Theodore Stone Institute of Hydrobiology, The Ohio State University, Put-in-Bay, Ohi

Investment prospects of fish farming in the Jos-Plateau, Nigeria

The investment prospects of fish farming in the Jos-Plateau, Nigeria, strategically located in about the centre of the country are discussed with special reference to its numerous abandoned mine lakes and the tripartite role of government, universities and individuals. In the Jos-Plateau, about 17.0 km super(2) is covered by these disused mine lakes, making up about 20-30% of the area covered. In such enterprise, problems commonly encountered, like population growth and government planning policies, fish demand and supply, manpower, feed and seed availability, preservation, processing and marketing are discussed. Inspite of these, prospects still abound with regards to land-use of these numerous disused mine lakes and feed availability based on the principles of using both industrial and farm by-products for fish culture, processing and marketing. These potentials, if properly harnessed, will help to supplement the protein insufficiency in the diet of the populace. In this regard, proposals on the economics of production and sales, strategies for achieving these development goals, cost-benefit analysis and their implications in further development of fish culture are discusse

Photosynthesis of Natural Communities Dominated by Cladophora Glomerata and Ulothrix Zonata

Author Institution: The Franz Theodore Stone Institute of Hydrobiology, Pun-in-Bay, Ohi

Surface Water Movement, Western Lake Erie

Author Institution: F. T. Stone Institute of Hydrobiology, The Ohio State University, Put-in-Ba

Cyanobacterial biodiversity from different freshwater ponds of Thanjavur, Tamilnadu (India)

Cyanobacterial biodiversity from different freshwater ponds of Thanjavur, Tamilnadu (India). Studies on the cyanobacterial biodiversity of 5 different freshwater ponds in and around Thanjavur, Tamilnadu during summer month (June, 2004) has been made and compared their variations among five different ponds. In addition, certain physico-chemical parameters of pond waters such as dissolved oxygen, net productivity, pH, carbonate, bicarbonate, nitrate, nitrite, total phosphorus, inorganic phosphorus etc. were also analyzed and statistically compared with the cyanobacterial diversity. Totally 39 species of 20 genera of cyanobacteria were recorded in all 5 different ponds. Only 6 species of cyanobacteria were identified in Pond 1 (Dabeerkulam), where a massive bloom of Microcystis aeruginosa was recorded, which had a significant effect in reducing the other cyanobacterial population. As many as five species namely Aphanothece microscopica, Synechocystis aquatilis, Merismopedia glauca, Oscillatoria limnetica and O. subbrevis were common in all the ponds surveyed except in Pond 1.Biodiversidad de cianobacterias en diferentes charcas de agua dulce de Thanjavur, Tamilnadu (India). Se ha inventariado, y comparado entre sí, la biodiversidad de cianobacterias de 5 charcas de agua dulce de Thanjavur, Tamilnadu (India); el estudio se llevó a cabo en junio de 2004. En paralelo, también se determinaron los valores de ciertos parámetros físico-químicos que podrían explicar las variaciones en los valores de biodiversidad: oxígeno disuelto, productividad neta, pH, carbonato, bicarbonato, nitrato, nitrito, fósforo total, fósforo inorgánico, etc. Un total de 39 especies de 20 géneros de cianobacterias se identificaron entre las 5 charcas. En la charca 1 (Dabeerkulam) se detectaron 6 especies, pero cuando tuvo lugar una flor de agua de Microcystis aeruginosa las restantes especies apenas se pudieron detectar. Cinco especies (Aphanothece microscopica, Synechocystis aquatilis, Merismopedia glauca, Oscillatoria limnetica y O. subbrevis fueron comunes en todas las charcas con excepción de la número 1

A preliminary investigation into the effects of a sex-reversal androgen, methyltestosterone, on food utilization and growth of Sarotherodon niloticus (L) fry

Three groups of Sarotherodon niloticus fry were fed for 8 weeks on diets either treated with 17- & methyltestosterone (MT), alcohol (CA), or untreated (CO). Growth rate and food utilization in the different groups were compared. Results indicate that the best growth, Feed Conversion Ratio (FCR), Protein Efficiency Ratio (PER) and Mean Growth Rate (MGR) were obtained with the MT diet. There was no significant difference (P 0.05) in growth and food utilization of the CA and CO fry, nor in the mortality rate of the 3 treatments. The androgen, methyltestosterone promotes growth and protein anabolism without producing toxic effects in S. niloticu