INTRODUCTION To Construction Of Fish Pond

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Selection Of Site And Necessary Precaution.
      One of most important part of planning is fining the right place (selection of the site) for the pond.
     Actual site selection requires field observations and studies from the condition to determine their. Compliance with fish culture requirement, good topography suitable soil,ability of the soil to hold water and adequate water supply.

     There are some factores that work together to make a good site for fishpond.

1) Physical properties: The most suitable soil for fishpond is a clay soil where seepage is low,in other words,the soil has to be water proof .when ponds are constructed on sandy soil,the seepgae usually ,is quite high often reaching 10cm or more,Rocky and stone soil as well as pebble bed are notfit for pond construction.

ii). Chemical properties: Acidic soils are common in many part of the world. For example,Lathyritic soil with low pH may be harmful for the of fish and adequatic organism. Such soils ,if the pH is not corrected,it may limit yield or prevent fish culture entirely.

iii) Topography is a word used to describe the shape of the land,wheather its flat oor hilly, upland or lowland etc. The topography of the land determines the kinds of ponds shape.They can be large or small .All of these are determined by the topography of the land whereas the farmers.

Iv) Oxygern: Different fishess have different oxygen requiremnets but a range of 4-8mg/1 is optimal and some low in consequence of temeperature and increased organic matter,dissolved oxygen profile influence the stocking density of ponds.

VI) Turbidity: Turbidity is the term for the suspended dirt and other particles in water. Turbidity can be a problem especially in shallow ponds.If the dirt and particles prevent sunlight from reaching the plankton,so that the phytoplankon cannot produce oxygen.An operating , pond can be turbi if there are bottom feeders such as common carp stirring up the bottom mind. Turbidity in pond can be measure just by looking at the pond water closely.

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      Classification of pond based on water
1) Rain Fall: some pond called ‘shy’ pond rely on rainfall to fill their need for water

2) Run Off: Some pond gravels and sand pit which fill when water from the surrounding land area runs into them

3) Natural water: Most ponds are filled with water that comes from natural springd or wells or with water that been channel or diverted and brought in from stream,rivers or lakes.

4) Spring: Some pounds are built where there is a spring to supply water.Spring water is water under the ground that has found a way to get out .It leaves the ground and become a stream as it flows away.spring water is good for fishponds because its usually cean (uncontarminated) and has no wunwanted fish or fish egg in it.If the water from a spring has travelled very far, it may need to be filtered before its used for fishpond.

5) Well: The best source of water for a fish pond is well water. Well water has a few contaminants and if the well is a good one the water is contiously available.

    However well water and spring water are often low in oxygen content.Fish need to have oxygen in their water to live . Since this problem is overcome easily, the major factor to be considered here is an adequate water supply.

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