Prestocking Management Of Fish Pond How to prepare fish pond before stocking

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Prestocking Management Of Fish Pond
Pond management must be scientifically managed to provide maximum fish production. Fish culture in the ponds is essentially a three-tier culture system, which involves setting the nursery ponds for 2-3 weeks (2-3 cm) for a period of about 2-3 months, followed by about 3 months for 2 months. 3 weeks old fry is raised. Nurture the pond before the fungal stage (8.12 cm) before it is finally placed in the ponds to grow to the fish of the table. To enhance fish production and increase productivity, the management practices package should be strictly followed. The purpose of precasting management is to ensure the availability of natural food and sufficient oxygen dissolved. The pre-stored section of management includes the following configuration steps.


1. Drying of ponds
If possible, the ponds should be completely sun-dried. Improves fertility and affects the physical-chemical and biological condition of the pond. Drying fish ponds will kill fish parasites and their larvae and other disease-causing organisms. It will also eliminate unwanted or grass fishes.
2. Elimination and control of water weeds and algae
Fish ponds are undesirable and harmful to fish culture. They reduce dissolved oxygen in the water. Fish suffer stress due to dissolved oxygen depletion and wide fluctuations between dissolved oxygen values ​​during the day and night. They also expel a large number of nutrients from the water, which would otherwise be involved in the production of plaque in the pond. The dense growth of submerged weeds limits the movement of fish and interrupts the fishing process. Therefore, it is necessary to remove/remove weeds before storing fish in the pond.
Unwanted weeds are controlled or eliminated in the following ways.
1) Manual or mechanical method
2) Chemical method and
3) Biological method

Grass carp are the most effective biological control agent against mostly submerged and floating weeds, except water furs. Grass carp usually eats at least 50 ch of its body weight a day. About – a month to clean a hydraulically infected aquatic body. Approximately clear –––––– fish, each weighing 0.5 kg. Hydraulic infestation density is generally up to 5-25 kg / m2 (Elekoni and Skumaran, 1964).

3. Elimination of predators and weeds
If predator fishes in the pond are harmful to decent fishes as they fall prey to them (spawn, fry, and toes) and grass fishes compete with carp for food, space, and oxygen. Therefore, before storing these ponds, the hunter and weeder should be completely removed from the nursery, breeding and pond storage. Frequent drag traps can remove predators and weeds from the pond, but this does not guarantee complete elimination. Therefore, draining the pond out of the water and poisoning it is the only alternative, as some types of fish fall into the mud and escape the nets.
Predators and weeds can easily be killed by drying the pond. However, this is not always feasible or economical, therefore, fish poisons are used to eliminate predators and weeds. One should go for cheap and readily available fish poison. The effect of fish poisoning varies from one week to 6 weeks depending on the type of poison used. Therefore, the poisoning of water should be ensured 2 to 6 weeks prior to fish storage. Seasonal ponds that are dry during the summer months do not need to be treated with fish poisoning.

Recommended Diet for Fish Poisoning
Poison
Food (kg / ha / m)
Bleaching powder
350 – 500
Mohawk Oil Cake
2 500
Uncontrolled ammonia
20 – 30
Croton Ticlim Powder Badge
30 – 50
Root powder of Malaysia peachy carpa
40 – 50
Powder of Militia Pacifica seeds
40 – 50
Berenctonia acetancula seeds powder
150
Eating tamarind seeds (tamarind indica)
1 750 .2 000
Tea seed cake (Camellia sinensis) *
750

Although there are a number of chemicals and plant sources available in the market that are toxic to fish, only a limited number of them are safe and suitable for fish culture purposes. A suitable poison of fish has been selected based on the following criteria.
ison poisonous fish is safe for human consumption
The pond has the least negative impact on the biota
• The poisoning period should be short term
res should not have a residual effect
آسان Easy trading availability
اد Simplicity of application
• Cost considerations.
Mohwa oil cake, bleaching powder, and ammonia are considered suitable.

4 Controlling aquatic insects
In their larvae and/or adult stages, many aquatic insects are prone to fish hatching and fry and also have to contend with food. Useless swimmers, cedar waterbugs (ballastoma), water scorpions (Napa) and burgers enter nurseries, especially during monsoons and are prone to spawn and fry.
Pests can be eliminated by repeatedly catching nets with small dirty nets. They can also be eliminated by the use of pesticides, but this method is not recommended because these chemicals kill zooplankton and fish spin and fry. The main method of eliminating insects is to apply a thin pigment film on the surface of the pond that reduces the respiratory tract of aquatic insects. Using a mixture of soap and oil is an effective way to control aquatic insects.

Pond remediation methods for predator aquatic insects
Treatment dose / ha
Soap Oil Emulsion 56kg Vegetable Oil + 18kg Soap
Diesel oil 50-60
Kerosene 80 – 100
Turpentine oil 75
Diesel Emulsifier Diesel 50 * Emulsifier 37.5 ml + water 2

Limited and Fertilization
To maximize fish production, natural lime and fertilizers should be used properly to increase their natural fish feed. Organic and inorganic fertilizers can be used to enhance the natural production of ponds that provide nutrients, vitamins, and minerals.
The length is 15 days before being stored in the pond with the fish fry and finger. Generally, 200 kg per hectare of lime is used beneath the pond. The amount of lime applied to the pond depends on the pH of the pond. To take full advantage of the lime, the pond should be left to dry after use.

Need for lime
Soil pH Soil-like lime (kg/ha)
4.0-4.9 Extremely acid 2000
5.0-6.4 Moderate Acids 1000
About 6.5-7.5 Neutral 500
7.5-8.4 Light Alkaline 200
8.5-9.5 Too much alkaline nail

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