The effect of dissolved oxygen concentrations (110-120, 90-100, 70-80, 50-60, 30-40 and 10-20% saturation) on recovery of Panulirus cygnus from a period of activity/emersion was investigated. Biochemical disturbances induced in P. cygnus by emersion and handling included a large decrease in the hemolymph pH (0.7 units) and an increase in the hemolymph lactate concentration (2.44 mmol L-1). Re-immersion resulted in very high rates of oxygen consumption (up to 2.5 times the pre-emersion rate), elevated hemolymph glucose (1.1-4.5 mmol L-1) and further increases in hemolymph lactate (2.7-11.1 mmol L-1), with actual concentrations dependent on the dissolved oxygen concentration. Water oxygen concentrations of 50-60% saturation or less slowed the rate of recovery; all lobsters recovering in water with 10-20% oxygen saturation died within 12 hours. Based on the rate of recovery of physiological parameters, lobsters should be allowed to recover for a minimum of eight hours between stress episodes, whilst maintaining an oxygen concentration of 70-80% saturation or above.

Item Type:	Refereed Article
Research Division:	Agricultural, Veterinary and Food Sciences
Research Group:	Fisheries sciences
Research Field:	Fish physiology and genetics
Objective Division:	Animal Production and Animal Primary Products
Objective Group:	Fisheries - wild caught
Objective Field:	Fisheries - wild caught not elsewhere classified
UTAS Author:	Crear, BJ (Mr Bradley Crear)
UTAS Author:	Forteath, GNR (Professor Nigel Forteath)
ID Code:	22703
Year Published:	2001
Web of Science® Times Cited:	6
Deposited By:	TAFI - Marine Research Laboratory
Deposited On:	2001-08-01
Last Modified:	2011-11-16
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