Effects of dissolved oxygen, temperature and salinity on the oxygen consumption of the grass shrimp, Penaeus monodon. In：J.L. Maclean, L.B. Dizon and L.V. Hosillos (eds.)

Abstract

The resting rate of oxygen consumption by individual Penaeus monodon over a size range of 0.4-80.0 g at three different temperatures (20-25 and 30 deg C), six salinities (3, 5, 15, 25, 35 and 45 ppt) and a range of dissolved oxygen (DO) levels (less than saturation point) was measured in a closed system using a polarograph oxygen meter (YSI Model 57). The shrimps were starved for 24 hours and held in the respiration chamber for 3 hours prior to the commencement of each experiment. Oxygen consumption was found to be independent of DO over 4.0 mg/l at 30 ppt and 20, 25 and 30 deg C. Oxygen consumption was reduced by 7.4-11.9%, 22.2-35.3% and 63.0-71.4%, respectively, when DO was 3.0, 2.0 and 1.0 mg/l. The general allometric equation was used to describe the relationship between the rate of oxygen consumption (R) and body weight (W) when DO was greater than 4.0 mg/l. Salinity had no measurable effect on oxygen consumption within the tested range. However, at 3 ppt, shrimp less than 1.3 g showed greater tolerance to DO levels than shrimp larger than 9.2 g.