The growth rate and percent survival of Betta splendens when submitted to formulated diet and live food treatments are evaluated. The three different diets were used and designated as: formulated diet (basal diet); live food diet (plankton) and mixed diet (formulated diet with plankton). The live food diet contained plankton belonging to an open pond. High mortality was reported with live food ...

background: heavy metals have destructive and irreversible effects on the human, plants and animals. some industries in yazd enter industrial wastewater to municipal wastewater collection system. this can lead to high levels of heavy metals in wastewater and in turn in the wastewater treatment plant effluent.   methods: this study was carried out during four months from december 22, 2009 to may...

An experiment was conducted over a period of 150 days at Can Tho, Vietnam to adapt integrated cage-cum-pond systems to local conditions in Vietnam, to determine appropriate stocking density of selected fish species in cages, to assess growth and production of fishes in both cages and open ponds, and to assess the economic and environmental benefits of this integrated system. Nile tilapia (Oreoc...

T. AHMAD • Department of Mathematics, Faculty of Science, University of Technology Malaysia, 81310 Skudai, Johor, Malaysia. • Electronics Research Group, School of Engineering, Sheffield Hallam University, City Campus, Pond Street, Sheffield S1 1WB, UK M. A. HOSSAIN • Department of Computing, University of Bradford, Bradford BD7 1DP, UK. • Electronics Research Group, School of Engineering, Shef...

Erosion and sedimentation are normal geologic processes which are usually accelerated by irrigating agricultural lands. Of the sediment in irrigation runoff, 70% was removed in a sedimentation pond. Removal efficiency correlated well with flow rate and sediment concentration. Pond design should provide maximum velocity reduction early in pending, allow adequate storage space for the larger part...

Decision support systems (DSS) are potentially valuable tools for assessing the economic and ecological impacts of alternative decisions on aquaculture production. In this paper, we discuss the philosophy of design, functional modules and application areas of POND, a decision tool that has been developed to allow analysis of pond aquaculture facilities by the use of a combination of simulation ...

In order to define an appropriate mathematical model for the flow and mixing characteristics of a high-rate algae pond, impulse-response tests were carried out on an experimental pond located at Ein Karem, near Jerusalem, at Reynolds number = 10 5, and on two scale models of the same pond, at 2 000 < Re < 20 000. Each pond consisted of a continuous rectangular channel with seven 180° bends, and...

Monthly inflow and outflow data were collected from three wet detention ponds in Wilmington, North Carolina, for a 29-mo period. Two ponds drained urban areas consisting primarily of residential, mixed services, and retail usage, while the third mainly drained residential and golf course areas. One of the urban ponds achieved significant reductions in total nitrogen, nitrate, ammonium, total ph...

Odour emission rates were measured for seven different anaerobic ponds treating piggery wastes at six to nine discrete locations across the surface of each pond on each sampling occasion over a thirteen month period. Significant variability in emission rates were observed for each pond. Measurement of a number of water quality variables in pond liquor samples collected at the same time and from...

Amphibians represent a “canary in the coal mine,” as such the diversity and abundance of amphibians is a good assessment of ecosystem health. Pitzer College’s Firestone Center for Restoration Ecology (FCRE) in Barú, Costa Rica, contains mostly recovering rainforest. To monitor its recovery progress, the anuran diversity and density was investigated in 2008, continuing the amphibian population a...