Enterocytozoon hepatopenaei (EHP) is one of the biggest challenges in shrimp aquaculture. EHP is an intracellular parasitic disease that infects the hepatopancreas and intestine in shrimp and can cause retarded growth, size variation and major economic losses. In a challenge laboratory study at Shrimpvet (Vietnam), the effects of the inclusion of single cell proteins (SCP) and bacterial nucleotides in shrimp feed was inves tigated on the tolerance against EHP infection.
The trial was carried out for 51 days including 2 days of acclimation, 14 days pre-challenge, 7 days of EHP p er os challenge, and 28 days of post-challenge. The trial consisted of five groups with five replicates including : g roup 1 (positive control), g roup 2 (nucleotides at 400 g/MT inclusion ), group 3 (nucleotides at 800 g/MT inclusion ), group 4 ( SCP strain_1 at 5% inclusion ), group 5 (SCP strain_2 at 5% inclusion ). Fifty shrimp were stocked into each 350 Liter experimental tank.
Survival rates and growth performance parameters (at day 51) are shown in TABLE 1.