Table 3.
Clinical signs of shrimp and prawn diseases/syndromes observed by farmers.
| Diseases/syndrome |
Farm reported (%) |
Species | Clinical signs observed by farmers | ||
|---|---|---|---|---|---|
| SP | SPP | PP | |||
| White spot disease | 90 | 40 | 0.00 | Shrimp | White spot mainly on carapace and/or sometimes a little bit on whole body surface, aggregation at gher edge, lethargic, less appetite, reduced preening activities, erratic or spinning swimming near to gher dikes, reddish discoloration |
| Vibriosis | 9.4 | 2.9 | 0.00 | Shrimp | Lethargic, black spot on different parts of the shell, abnormal swimming behavior at the edge or surface of gher |
| Cotton shrimp | 3.9 | 1.4 | 0.00 | Shrimp | Spongy body, sluggish movement, opaque and whitish muscle (looked like cooked shrimp) |
| Broken antenna and rostrum | 0.00 | 74 | 82 | Prawn | Antenna and rostrum broken, erosion of antenna and rostrum, lethargic, less appetite, aggregation at the gher edge |
| Black gill | 0.00 | 19 | 17 | Prawn | Black spot on gill under carapace, erosion on carapace and gill, sluggish movement, less appetite, damage gill |
| Hepatopancreatic necrosis | 0.00 | 7.2 | 14 | Prawn | Swelling of gills or water accumulation under carapace, sluggish movement, erratic swimming at gher edge, less appetite, discoloration of hepatopancreas |
| Soft shell | 0.00 | 10 | 12 | Prawn | Shell is thin and persistently soft, shell is rough and wrinkled, lethargic, slow growth rate |
| Unidentified disease | 10 | 0.00 | 5.3 | Shrimp/prawn | Blue or greenish scum on body surface, lethargic, less appetite, aggregation near the gher bottom |