Water Selection for Prawn Culture
In the selecting place we have take up the research about the water for minimum one year then only we came to know that each season in a year how the water ability is changing. According to this the salt ability should be in the size of 10-30ppt. The more or less salt ability will make the prawns stress and it will affect too.
The brackish river water of salt ability will be up to 5ppt and the head zone will be 5-18ppt and the upper zone is 18-25ppt gradient zone is about 25-30ppt and the salt ability of lower zone will be separate. In this 18-30ppt in nearby the salt ability of water spreads make the ponds should be good.
The Penaeid prawns should stand the difference of salt water ability, cause of low salt ability there is a chance of getting parasite disease. In a region of salt ability the growth of prawns will be less. If the pH will be situated around the size of 8 should be good that can be from 7.5 to 8.5. If it is less than7 and more than 9 it will affect the prawns.
The oxygen should not be less than 3.5ml for a liter will be good. If the prawns will be less than in size of oxygen and if it stands, in that also if the growth can be obstructed the oxygen size should not be decrease. Juveniles and big prawns to live their livelihood need the less amount of oxygen.
Water “sediments” should not be mixed if it is happen, in water the entering of sunlight will be obstructed and the photosynthesis will also obstructed the primary production will also get affected. Because of this the production oxygen will be worthily, the prawns “respiration” will get affected and it leads to dead. Therefore, if the mixed water does not irrigate directly, first in reservoir ponds we should reservoir the water if the water gets clean after that we should have to leave into the growth ponds. For this the growth ponds in due course we obstruct the puddle elevation. By and then the sediment or the puddle will be exited and we get the reservoir pond by depth.
In the selecting place we have take up the research about the water for minimum one year then only we came to know that each season in a year how the water ability is changing. According to this the salt ability should be in the size of 10-30ppt. The more or less salt ability will make the prawns stress and it will affect too.
The brackish river water of salt ability will be up to 5ppt and the head zone will be 5-18ppt and the upper zone is 18-25ppt gradient zone is about 25-30ppt and the salt ability of lower zone will be separate. In this 18-30ppt in nearby the salt ability of water spreads make the ponds should be good.
The Penaeid prawns should stand the difference of salt water ability, cause of low salt ability there is a chance of getting parasite disease. In a region of salt ability the growth of prawns will be less. If the pH will be situated around the size of 8 should be good that can be from 7.5 to 8.5. If it is less than7 and more than 9 it will affect the prawns.
The oxygen should not be less than 3.5ml for a liter will be good. If the prawns will be less than in size of oxygen and if it stands, in that also if the growth can be obstructed the oxygen size should not be decrease. Juveniles and big prawns to live their livelihood need the less amount of oxygen.
Water “sediments” should not be mixed if it is happen, in water the entering of sunlight will be obstructed and the photosynthesis will also obstructed the primary production will also get affected. Because of this the production oxygen will be worthily, the prawns “respiration” will get affected and it leads to dead. Therefore, if the mixed water does not irrigate directly, first in reservoir ponds we should reservoir the water if the water gets clean after that we should have to leave into the growth ponds. For this the growth ponds in due course we obstruct the puddle elevation. By and then the sediment or the puddle will be exited and we get the reservoir pond by depth.
- The juveniles for growth must get more in growth place that juveniles should be good for growth and marketing. P.Indicus P.Manodon, P.Semiselcatus and P.Mercuvensis.
- The growth place region should be in the presence of puddle, the ponds shore should make assurance to help the hard soil should be get near to that place.
- We should select the place where the urban drainage and the factory wastage should not be mixed.
- Near the pond and the various regions the rain water should not stand and more in rainy season the water should not affect the ponds and it is comfortable with the outlet.
- During growth the prawns should get the food easily nearby like the natural food and artificial food.
- We have to get the workers for doing the works like digging the pond, maintenance, juveniles saving, then after the growth of prawns we have to catch it.
- We have to get the things for the growth of prawn, to take away the caught prawns, need a good transportation.
- The place the theft should not be held. Before selecting the place we should get the needed information and we should depend on the revenue department and forest department and know about them.
- We should concentrate on the above information and follow the same our wish and all comfort should not get naturally. In this the importance for selecting and growing prawns should be good. We have to leave this in the hands of expert and they will choose the best place for growing prawns.
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