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Development of Commercially Viable Prawn Post Larvae Production Technique in Earthen Pond

Dr. Md. Lokman Ali
Chairman
Dept. of Aquaculture, Patuakhali Science and Technology University, Patuakhali

Kaniz Ruksana Sumi
Researcher
Dept. of Aquaculture, Patuakhali Science and Technology University, Patuakhali

Abstract/ Executive Summary:

Egg custard were used for larvae rearing after 10 days up to the end of the rearing period to reduce the feed cost. The ingredients of egg custard were 60% egg and 40% powder milk. The ingredients were mixed by a blender and boiled for 30 min to make a cake. Then the egg custard was pass through small mess net and the small particles were washed in water to remove the soluble materials. The smaller particle sized custard was fed to smaller larvae and as the larvae grew up the custard particle size was also increased. All uneaten feed were removed after one hour of feeding from larvae rearing chari. After three days interval 30% water was changed. The larvae were reared up to post larval stage (PL), when they took the shape of adult prawn and started swimming changing from backward to forward movement and changing from upside down to normal position. The survival rate of larvae was 56.7%.

Keywords: Development, Prawn, Post larvae production technique, Earthen pond

Location: Khepupara, Patuakhali

Start Date: July 2012

End Date: June 2014

Program Area: Variety and Species

Commodity: Prawn

Objectives:

To develop a sustainable and commercially viable prawn PL production technology in pond; to produce low-cost and chemically contaminated free viable PL; to optimize the stocking density of prawn larvae in larvae rearing pond (LRP); to determine the suitable feed for prawn larvae in LRP.

Methodology:

To develop a sustainable and commercially viable prawn PL production technology in pond, M. rosenbergii PL were stocked as treatment T₁ (10,000/m²), T₂ (12,000/m²), T₃ (15,000/m²). Saline water was collected from adjacent river through a filter bag to remove any solid material and predator of water by using submersible pump. Then the saline water was kept in a holding pond for settling down. After settling down the saline water was transferred into larvae rearing ponds (LRP). Water of the ponds was treated with lime (1 kg/dec.) and the fertilized with triple super phosphate (75g/ dec.) and urea (150g/dec). Saline water (12 ppt brakish water) was bleached with 60% chlorinated bleaching powder at a dose of 12 ppm and aeration will be performed for 24h to kill all types of disease producing organisms such as protozoan parasite, bacteria, virus, fungus etc. After one day, these salt water was treated with 12 ppm sodium thio-sulphate and air was blown for one day to remove the chlorine of bleaching powder because chlorine is harmful for prawn larvae. Female prawn bearing gray and dark yellow coloured eggs collected from pira and biskhali rivers of Borgona district and transferred to experimental ponds. Gray colour eggs were hatched within 1-3 days but the hatching time of yellow is 5-10 days. Then brood prawns were kept in the hatching hapa set up in LRP for hatching after 10-15 minute treatment in 20 ppm formalin solution for minimizing any contamination. Hatching hapa was provided with shelter to avoid cannibalism.

Source of Information: Annual Research Program 2012-13. BFRI, Mymensingh.

Article Link (Online Journal):

Funding Source:

1. Government

Budget: Five lakh

Total Budget (Tk.) : Five lakh

Achievement/Findings:

Alternate PL production technique of freshwater prawn would bring a great opportunity to supply low cost and sufficient amount of PL for prawn farming. This technology also help us to save the import cost because air blower, generator, thermostat water heater, Artemia and chemicals are imported from other country. On the other hand, hatchery PL are often contaminated by different harmful chemical and antibiotic but pond PL will be free form harmful chemical and antibiotic.

Knowledge Management: Report/Proceedings