| Sumario: | Since the very first appearance of White Spot Syndrome Virus (WSSV) in April 1999 inCentral and South America, massive mortalities of Pacific white shrimp, Litopenaeusvannamei (Boone), in semi-intensive ponds are occurring. In very few cases shrimpsurvival is above 25 %. Three experiments were conducted in Ecuador from March 2000 toMay 2001 to compare production results of shrimp directly stocked in 100 m2 ponds at150000 PL-12 / Ha. Experiment 1 evaluated immunostimulants, spray-dried plasma,tolerins and antibiotics in the feed. Production results were not significantly differentamong treatments that ranged from 800 to 1200 kg / Ha. Experiment 2 evaluated the use ofCa(OH)2 and water exchange in plastic-lined and earthened ponds. Production results weresignificantly higher in lined ponds and ranged from 400 to 850 kg / Ha. Experiment 3evaluated the use of kelp meal, wheat gluten, and a synthetic binder in the feed. Productionresults were not significantly different among treatments that ranged from 1100 to 1400 kg/ Ha. It is speculated that these good production results were mainly obtained due tocomplete experimental system dry-out between culture cycles and water filtration through300 μm mesh screen to fill ponds that probably resulted in reduced WSSV load in theculture system.
|
|---|
