Online farming

In order to live, fish need sufficient oxygen. Among fresh-water fish the amount needed varies from fish to fish. Regarding the kinds likely to be kept in a garden pool, rainbow trout need water that is teeming with oxygen,whereas carp and tench are happy with much less. Fish obtain their oxygen largely from the are and turbulent water absorbs air in considerable quantities. In the course of a river's run from its source, probably high up in the mountains, to the sea, it passes through various stages creating a number of different environments that are optimum for a range of fish. High up, for instance, the screamer rush down rocky slopes. As it sweeps by these obstacles the water leaps and surges and absorbs copious quantities of oxygen from the air, Later as the bottom of the water couscous changes in nature from hard rock to soft rock, the soft rock is worn away over the years and this creates a vertical fall. As the water tumbles over the edge of this waterfall, it divided into numerous small streams, which, because of the greater exposure to the air, absorb still more oxygen. As each watery spout falls into the pool below it carries quantities of air to the bottom of the water, where once again life- giving oxygen is released into the water . As the slope of the river bed levels out a little lower down and the stream widens and becomes calmer, fish and water plants, which also provide oxygen, begin to appear . Soon , while the water is still cool and lively with oxygen - waters become little lower down, as the oxygen,as the oxygen - laden waters become a little warmer, rainbow trout abound . still later as,the bed of the river becomes more level, the stream runs more slowly, the rate of absorption of oxygen falls and the waters begin to war, it, fish such as carp and tench, can love with less oxygen, appear, The waters also produce an abundance of vegetation , which provides food for them.


If fish such as rainbow trout are are to be raised successfully in a garden , the first essential is to made sure that the water is teeming with oxygen.For other fish - carp, for example- rather less oxygen . One way of ensuring that enough oxygen is available in the water of a man-made pool is to simulate as far as possible what happens in Nature . More especially in an informal pool this can be readily done by introducing a watercourse with waterfalls and rapids. Apart from its practical value ,such a layout would made a superb focal point for the garden. The extent to which water can be adequately Oxygenated in this manner depends, of course, on the space available .If the pool complex is restively small and there can only one, compels is relatively narrow waterfalls to maintain the correct proportion, it might be necessary to install an informal fountain, or better slit a waterspout ,which rises some feet into the air and then splashes vigorously on the surface of the water to provide oxygen.In a formal pool in a paved area, simulating Natural would be unsuitable and you would have to install a fountain. Fountains and waterspouts need a pump to keep the in circulation. Fountains, mechanical aerators and pumps are discussed in Chapter the chapter describes methods of constructing a watercourse with artificial rapids and waterfalls as a means pf providing oxygen.