Journal
AQUACULTURE
Volume 258, Issue 1-4, Pages 34-41Publisher
ELSEVIER
DOI: 10.1016/j.aquaculture.2006.03.043
Keywords
Penaeus monodon; Photobacterium damselae subsp damselae; temperature; susceptibility; immune parameters; phagocytic activity; clearance efficiency
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Tiger shrimp Penaeus monodon held in 25 parts per thousand seawater and 26 degrees C seawater were injected with Photobacterium damselae subsp. damselae grown in TSB at a dose of 8.48 x 10(4) colony-forming units (cfu) shrimp(-1), and then reared onward at water temperatures of 22, 26 (control), 30 and 34 degrees C. Over 24-96 h, the cumulative mortalities of P. damselae subsp. damselae-injected shrimp held in 22 and 34 degrees C were significantly higher than those for injected-shrimp held in 26 and 30 degrees C. In a separate experiment, shrimp held in 25 parts per thousand seawater and 26 degrees C, and then cultured onward at 22, 26 (control), 30 and 34 degrees C were examined for immune parameters, phagocytic activity and clearance efficiency of P. damselae subsp. damselae at 12-96 h. THC (total hemocyte count), DHC (differential hemocyte count), phenoloxidase (PO) activity, respiratory burst, superoxide dismutase (SOD) activity, phagocytic activity and clearance efficiency in shrimp decreased significantly after 24-96 h transfer to 22 and 34 degrees C. It was concluded that transfer of tiger shrimp P. monodon from 26 degrees C to 22 and 34 degrees C reduced their resistance against P. damselae subsp. damselae infection. (c) 2006 Elsevier B.V. All rights reserved.
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