Shrimp Culture/ Production Technique Part: 03

 Shrimp Culture/ Production Technique Part: 03

Part 03

Water management

·         Screening (3 layers, 60 mesh size) out water before fulfilling pond.

·         Spray crustracide (Ripcot) on the dike and slope to remove and kill the crustacean from the pond surrounding area.

·         Settle water in pond 3 days after complete pumping to hatch the egg (fish and crustacean) into the pond with aeration.

·         Set up all aerator and necessary material like catwalk, feeding tray,  fencing net etc in the pond before bleaching.

Catwalk and feeding tray

·         Set up aerator as per production target, like each 250 kg biomass 1HP electric motor capacity aerator or 2 paddle wheel aeration with 120 RPM.

·         Apply bleaching 60ppm in evening to eradicate all virus carriers from the pond and spray bleaching water in slope and dyke to kill the carrier from there also.

·         Follow up pH range before bleaching. That pH should be less than 8 during bleaching application.

·         If pH is high then reduce the pH level or increase the dose of bleaching to work properly.

·          If possible run aerator 15 minutes just after apply bleaching to mix well bleaching in pond.

·         After bleaching total pond and pond area should be highly restricted to avoid any type of contamination.

·         Use high concentrated KMnO4 solution in each entrance for disinfection before entry of anything.

Bio security

·         Next day onwards drug chain everyday in all area of pond between 8-11am and run aerator during drugging to reduce the residual effect of bleaching and also for prevent growth of filamentous algae.

·         Chain drugging should be done base on farm actual situation and condition.

·         Wait 5 days for de-chlorination and then start application for water plankton culture to make suitable water for PL stocking, like pH 7.6-7.9, Total alkalinity 120-150, Transparency 40-50 cm.

·         Approximately 25 days need from treatment to prepare the pond water for ideal preparation.

·         Per acre 5-10 kg molasses, 5-10 kg Rice bran, and 50-100 gm yeast powder if possible 200 gm pH Fixer dissolve in more water in 2-3days and apply its juice everyday upto 7 days continuous in presence of good aeration to develop good plankton in pond water for better survival. Dose and frequency will depend on water pH.

·         Any type of inorganic fertilizer, poor quality chemical and medicine are strongly advice to avoid application in culture pond.

·         If lime application necessary during water preparation apply D-100 (Dolomite) 25-50kg/acre.

·         Between 5^th to 25^th days apply 2-3 dose pH Fixer and 1-2 doses Super Biotic alternatively in 4 days interval to grow beneficial bacterial colony in pond water for better PL survival.

·         Water probiotic 2 kg pH Fixer/acre, and 1 kg Super Biotic/acre need to apply in each doses.

·         Base on present situation water probiotic, Molasses and rice bran dose can be needed more to support beneficial bacteria after stocking also.

·         After preparation of pond water ideal condition will be

·         pH 7.6-7.9

·         Alkalinity  120-150ppm          

·         Greenish color

·         Transparency will be 40-50 cm

·         DO = 5-8 mg/l

·         NH₃₌ 0 , H₂S=0, I-=0, NO₃=0

·         Hardness 1000-2000  ppm

·         Ca+  and Mg+ within saline water 0 to 10 ppt   = 1:1 ( 200 : 200)

Ca+ and Mg+ within saline water 10 to 15 ppt = 1:2 (200:400)

Ca+ and Mg+ within saline water 15⁺ ppt               ⁼ 1:3 (200: 600)

shrimp-culture technique part 04