Prawn culture pdf

Explore Audiobooks. Bestsellers Editors' Picks All audiobooks. Explore Magazines. Editors' Picks All magazines. Explore Podcasts All podcasts. Difficulty Beginner Intermediate Advanced. Explore Documents. Prawn Culture. Uploaded by PreetGill. Document Information click to expand document information Description: Prawns and their Culturing. Did you find this document useful? Is this content inappropriate? Report this Document. Description: Prawns and their Culturing.

Flag for inappropriate content. Download now. Related titles. Carousel Previous Carousel Next. Study of cubic III-V nitrides for device applications. Jump to Page. Search inside document. Related Interests Crustacean Zoology Nature. Documents Similar To Prawn Culture. Thamayanthi Nada Raja. Anonymous d70CGo. Ana Mardia. Juveniles of all commercially important species are trapped in paddy field.

From now onwards the salinity of paddy fields gradually increases and prawn juveniles are allowed to enter with water through controlled sluice gates. In and outflow of water are allowed daily during high and low tides but prawns are prevented to escape with bamboo mats placed inside the gates.

In April, the culture comes to an end. Organic Evolution of Life Zoology. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. Do not sell my personal information. Cookie Settings Accept. Manage consent. Close Privacy Overview This website uses cookies to improve your experience while you navigate through the website. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website.

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The design must suit the operational convenience and biological necessities of the prawn. Size and depth: For operational convenience a minimum area of one hectare is widely accepted size of the farm. Depending on the local conditions the size may vary between half to 5 hectares. Though square farm is more economical, rectangular farms are more suitable for the harvesting.

The constructed pond should have the capacity to hold at least 1. The dyke: The bottom of ponds needs to be sloped towards the drainage point or dyke. The drainage system should be designed carefully to prevent mixing of outlet water with incoming water. Water supply and Drainage: Appropriate water supply and drainage systems have to be designed keeping in view the water source.

The ponds should be easy to drain out the water. Ground water is preferable for filling the ponds as it is free from pollution.

When using canal water, it should be made free from pollution. Care should be taken to provide adequate micro filters for removing the eggs and larvae of fishes especially of omnipresent Tilapia. Step 3: Production system. Female brood stock is usually obtained from grow-out ponds or from capture fisheries.

Normally, "berried" or egg-carrying females are used only once. Fertilization: A typical male to female ratio is maintained in brood stock holding systems.

Within a few hours of copulation, external fertilization occurs and the eggs are transferred to the brood chamber beneath the abdomen of the female. Eggs are orange until days before hatching and just before hatching, they become grey-black. The eggs remain attached to the female during embryonic development.

At hatching, free-swimming zoeae are produced. Larval development: First stage zoeae are very small in size about 2mm and grow through 11 larval stages, to almost 8 mm at metamorphosis into post larval forms. Individual metamorphosis can be achieved in 16 days but usually takes much longer, depending on environmental conditions.

Feed and feeding: Feed management plays a very crucial role in prawn culture. More over natural food is preferred over supplementary food. But due to lack of natural food and to increase the growth and quality of production supplementary food is used.

Supplementary food include agricultural and animal husbandry by-products along with locally available cheap feeds like broken rice, tapioca root, trash fish, vegetable and animal feeds mixed in adequate proportions. The feed is produced in pellet form, which should sink in water quickly and should be intact for at least few hours till they are completely consumed by the prawns.

Prawns are generally fed only once a day. Food pellets are distributed uniformly on the surface of the pond or placed in wide containers set up at several points along the margin of the pond. The rate of feeding depends on the age of the prawns.

Step 4: Harvesting and processing. Pond reared giant prawns reach marketable size within months depending on the stocking rate and other culture conditions. Generally, giant prawns do not grow at uniform rate and difference in size appears in spite of stocking the seed from same brood. Hence size for harvest must be checked from time to time.

Harvesting can be done partially of completely. Partial harvesting is done for removing larger prawns from the pond at regular intervals.