A good guide is 4 to 5 square feet of water per mature fish or 2-3 mature fish per square meter of water surface in a pond environment. Serving All Your Pond & Lake Management Needs Since 1972. Arithmetically, the calculation is simple: 2000 meter square of static pond water can carry 3,600kg of catfish. Reply to this comment. Up to 30 centimetres per square metre (12 inches per square yard) of fish survive well in some ponds without being fed. Use Lbs Acre, ounces per square yard. The calculator reflects this by providing two extremes. A 20mm aggregate would need to be at least 40-50mm deep, and at least 50-60mm on driveways. Recirculatory is 300 per square metre, earthen pond is 50 per square metre.. Phil ... and diluted with at least 50 gallons of water. We recommend extending this to make it a square, as it is better to order too many aggregates than too few. You need to feed 45 to 120 grams per day to your fish. You would usually lay a 10mm aggregate at a depth of 30-40mm, but on a driveway this would need to be at least 50mm. Better still metric; Kilos per hectare which divided by 10 equals grams per square metre. 800.433.2950 Fax (580) 777-2899. Up to 30 centimetres per square metre (12 inches per square yard) of fish survive well in some ponds without being fed. Find Out km of land area) from The World Bank: Data Learn how the World Bank Group is helping countries with COVID-19 (coronavirus). What depth of gravel do I need? The amount of natural food available will vary from pond to pond. The fish to plants ratio is directly dependant on the feeding rate in a properly maintained aquaponic system. In general, fishes use about 80% of food and excrete the rest 20% as waste. Cold water tanks and marine tanks have higher surface requirements. The amount of feed fed to the fish daily is considered for per square meter of plant growing area. Ideally, you should keep only as many fish in a pond as the food chain in the pond can support. For slender fish, we use the value of 12 square inches of surface per length-inch of fish (or 30 sq cm/1 cm of fish) For full-bodied fish, we use the value of 20 square inches per inch (50 sq cm/1 cm) of fish. Many owners, however, have no idea how old their fish is or how large it will grow to be. Fish | Fertilizer | Fountains | Aerators | Chemical | Plant ID The amount of natural food available will vary from pond to pond. Before making any fish purchase, always research the fish in question to determine the actual adult size. Generally, according to the recommendation of the research, a static pond system has maximum stocking capacity of 1.8kg of fish per meter square. Population density (people per sq. If u use a flow through system it is 100 to 150 fishes per square metre. Ideally, you should keep only as many fish in a pond as the food chain in the pond can support. 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