Shrimp biotechnology

 

Farmers face many difficulties in the development of shrimp farming for income. In this situation, Phu Yen Fisheries Association has developed models shrimp biological filtering mechanism: Prawn tilapia + distribution + worms (worms), using food supplements "dried meat worm" reach high efficiency.

 

Model tiger prawn biology is done in ponds of Xuan Huynh in An Chan Sy (Tuy An), over an area of 2,000 m2. When shrimp is 1 month old, he released tilapia to clean the pond environment, stocking density: 1 / m2, fish size: 1-2 cm / child. For nutritional supplements, increasing resistance shrimp, Sy feeding him food for worms, dried meat, 1 day to eat in the afternoon. Dosage and do: Earthworms meat: 3 g / kg diet, bananas (peeled): 50 g / kg feed, barely a little water, grind them with fruit blender, mix well, for 30 minutes to dry, then feeding.

 

Crop achieved the following results: Survival reached 94.54%, yield: 1.300 kg; shrimp harvest: 80 / kg, price: 65,000 VND / kg, revenue: 84.5 million, profit of 20 million.

 

During culture, the environmental indicators in the ponds stable in the range allowed for prawn tilapia + distribution + earthworm was formed as biological filters clean the pond environment. Under the effect of nitrification bacteria in feces worms, shrimp waste is biodegradable, transformed into algal biomass, NH3 should always low, less than 0.1. Generative elements nitrogen, NH4 + ion, NO3- ... (in nutrient salts) are added continuously to the waterbody, algae stable. In ponds, algae identified, peel shrimp tilapia consumption, environmental cleanup. When discharged into the drainage channel, algae, organic residue ... is appropriate food for tilapia, tilapia is consumed, cleaned before being discharged into the external environment. Therefore, when introduced into the pond from the channel level, the water was clean. The algae absorb CO2, O2 waste in the process of photosynthesis takes place simultaneously with the shrimp enhanced respiration, O2 CO2 absorption after feeding, to help in the pond pH stability, within the limits safe for NH3 toxicity, healthy shrimp. In shrimp ponds stocked unisexual tilapia, tilapia should not drop often as they would disturb spawning substrate and the fry will compete with shrimp feed. Depending on the conditions of farming, but the shrimp were 1 month old to start complementary feeding worms meat, to eat regularly to increase resistance, disease prevention shrimp due to factors such as environmental the weather ...

 

Farmers can visit the learning model filtering mechanism shrimp prawn biology tilapia + distribution + worms (worms) Postgraduate his ponds to apply, replication.

 

 

 

Huynh Van Vu (Fisheries Society Phu Yen) - Phu Yen, 22/9/2008