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Mid-gut Intestine Fullness Examination
To assess shrimp feeding activity.
Equipment Required: Net and bucket with clean water for holding shrimp..
Procedure: Undertaken once a month to gain baseline normal values for shrimp in system. Collect 30 shrimp from various points in the tank and hold live. Evaluate shrimp immediately after removal from the tank. Hold each specimen so that the mid-gut abdominal intestine, from the first abdominal segment to the hind-gut (dorsal mid-line) is clearly visible. Grade the fullness of the intestine as follows: empty = 0; quarter full = 1; half full = 2; three-quarters full = 3; and full = 4. Make a note of the molt stage of ach animal by feeling the rigidity and feel of the exoskeleton. Grade shrimp either as molting (soft or flexible exoskeleton) or in intermolt (rigid exoskeleton). Return shrimp to tank.
Interpretation: Shrimp feed more or less continuously except during late pre-molt through molting (ecdysis). If shrimp are feeding, the average intestine fullness for a group sample will be greater than 0.75. Lower average values suggest the depressed feeding activity by the population. This would warrant further evaluation to determine the cause.
HEALTH MANAGEMENT & DISEASE CONTROL INDEX
Hepatopancreatic parvo-like virus (HPV) . Reo-like virus (REO) . Lymphoid organ vacuolization virus (LOVV) . Taura Syndrome Virus (TSV) . Rhabdovirus of Penaeid Shrimp (RPS) . White Spot Syndrome Virus (WSSV) . Infectious hypodermal and hematopoietic virus (IHHNV) . Baculovirus penaei (BP)
Vibriosis . Epicommensal fouling disease (filementous bacteria) . Necrotizing Hepatopancreatitis (NHP) . Black spot disease (BSD) . Mycobacteriosis
Larval mycosis . Fusariosis
Haplosporidia . Gregarines . Cotton Disease
Black Gill Disease (BGD) Dissolved Oxygen Crisis Nitrogen Gas Bubble Disease