Abstract
The effect of low pH on the tactile sense of Macrobrachium rosenbergii postlarvae was determined in the laboratory by means of two behavioural assays: shelter (netting) occupancy and jumping response to touch stimuli (taps) by a glass micropipette. The postlarvae were acclimated to pH 4, pH 5, pH 6 and pH 7.5 (control) in 45 L aquaria 5–7 d before the experiments. Shelter occupancy decreased with pH and was significantly lower at pH 4 and pH 5 than at pH 6 and in the control. The jumping response instantly followed a tap 93–98% of the time in the control, pH 6 and pH 5 treatments. However, the postlarvae showed significantly lower jumping response (65%) at pH 4, indicating an impaired tactile sense. Low pH 4–5 probably degrades the chitin of the sensory setae and inhibits the surface mechanoreceptors of the prawn postlarvae.
Highlights
Mechanoreceptors in crustaceans detect hydrodynamic signals that carry important abiotic and biotic information such as the presence and movements of prey, predators, aggressors, and potential mates (Douglass & Wilkins 1998; Herberholz & Schmitz 1998; Arnott et al 1999; Prakash & Kumar 2013)
The effect of low pH on the tactile sense of Macrobrachium rosenbergii postlarvae was determined in the laboratory by means of two behavioural assays: shelter occupancy and jumping response to touch stimuli by a glass micropipette
Spectrophotometry study demonstrated that the shell quality of the giant freshwater prawn Macrobrachium rosenbergii postlarvae and early juveniles was significantly affected by low pH especially at pH 4 (Kawamura et al 2015)
Summary
Mechanoreceptors in crustaceans detect hydrodynamic signals that carry important abiotic and biotic information such as the presence and movements of prey, predators, aggressors, and potential mates (Douglass & Wilkins 1998; Herberholz & Schmitz 1998; Arnott et al 1999; Prakash & Kumar 2013). Abstract: The effect of low pH on the tactile sense of Macrobrachium rosenbergii postlarvae was determined in the laboratory by means of two behavioural assays: shelter (netting) occupancy and jumping response to touch stimuli (taps) by a glass micropipette. The jumping response instantly followed a tap 93−98% of the time in the control, pH 6 and pH 5 treatments.
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