A survey of potential disease-causing organisms in bait shrimp from West Galveston Bay, Texas
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A survey of potential disease-causing organisms in bait shrimp from West Galveston Bay, Texas

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    Data are presented from a one year survey of potential disease-causing organisms in white shrimp, penaeus setiferus, and brown shrimp, K. aztecus, collected by commercial bait dealers in West Galveston Bay, Texas. The shrimp examined were purchased from bait dealers at 12 to 18 day intervals beginning on November 19, 1973 and continuing until November 22, 1974. Bacteria isolated from the blood of shrimp were predominately of the genera Vibrio, Aeromonas, and Pseudomonas. Vibrio occurred most often during July, August, and September, Aeromonas in the spring and fall, and, Pseudomonas in September, October, and November. One imperfect fungus of the genus Fusarium was isolated in March. An unidentified suctorian was observed attached to shrimp gills from May through December, while the peritrichous ciliate, Lagenophrys, was on the gills during all months except August and was most frequent in May and June. Two species of the stalked, peritrichous ciliates Epistylis and Zoothamnium were observed attached to the gills. Epistylis occurred in March and September, while Zoothamnium was widespread, occurring in every month with the highest incidence in May, June, and July. The gregarine, Nematopsis penaeus, was observed in the digestive tract of shrimp throughout the study. Only two shrimp exhibiting microsporidosis were found: Nosema nelsoni in April and Thelohania sp. in May. Larval nematodes were found in 10 to 100% of all samples except in November 1973. Seasonally, the incidence was highest during January through March. Numerous unidentified cestode procercoid larvae were observed in the midgut. The highest incidence occurred in August and September. The incidence of the larval Trypanorhynchid cestode, prochristianella hispida, remained fairly constant with little difference occurring between brown and white shrimp. Several unidentified Cyclophylidean larvae were observed encysted in the wall of the midgut of one shrimp and a metacer- caria of Opeocoeloides fimbriatus was observed in the hepatopancreas of brown shrimp.
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