Studies on diseases of black tiger shrimp (Penaeus monodon) water quality and planktons in low salinity pond culture
1996
Sarun Rucksapram
Diseases of giant tiger shrimp (Penaeus monodon) culture in low salinity (2-5 ppt) in Nakorn Nayok province was studied. Zoothamnium sp. was the most common protozoa found on gills and shell in the grow-out period. Vibrio parahaemolyticus. V. alginolyticus and V. vulnificus were the three predominant bacterial species isolated from hepatopancreas of clinical healthy shrimps. These bacteria were sensitive to chloramphenical, sulfamethoxazole with trimethoprim and nalidixic acid respectively. Histopathological examination revealed that the shrimps heavily infected with Zoothamnium sp. showed edema of gill lamellae. Water qualities in four giant tiger prawn ponds, in Nakorn Nayok province were studied during 12 weeks of the grow-out period. Sechidisc visibility ranging from 20 to 30 cm, temperature from 28.5 to 32 deg C, pH from 7.7 to 9.3, dissolved oxygen from 7.2 to 11.0 mg/l, salinity from 2 to 5 ppt, alkalinity from 46 to 76 mg/l, unionize-ammonia from 0.0175-0.1273 mg/l and nitrite-nitrogen from 0.000 to 0.0133 mg/l. Planktons in giant tiger shrimp ponds during the grow-out period were studied. Spirulina sp., Microcystis sp. and Oscillatoria sp. were the dominant species found through-out the culture period.
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