Bubble formation in crustaceans following decompression from hyperbaric gas exposures.

Area of Science:

• Marine Biology
• Physiology
• Biophysics

Background:

• In vivo bubble formation is a critical concern in diving physiology.
• Understanding bubble formation in crustaceans provides insights into decompression sickness.
• Previous research has not fully elucidated the factors influencing bubble formation in diverse crustacean species.

Purpose of the Study:

• To investigate in vivo bubble formation in various crustacean species under different gas pressures and decompression conditions.
• To determine the susceptibility of different crustacean species and life stages to bubble formation.
• To explore potential mechanisms, such as tribonucleation, driving bubble formation.

Main Methods:

• Equilibrating various crustaceans (brine shrimp, copepods, crabs, shrimps) with high gas pressures (argon, helium).
• Rapidly decompressing specimens to atmospheric pressure and observing bubble formation.
• Manipulating limb movement (stimulation and inhibition) to assess its effect on bubble formation.
• Applying high hydrostatic compressions and slow compressions to evaluate their influence.

Main Results:

• Susceptibility to bubble formation varied significantly among species and life stages, with adults generally more susceptible than larvae.
• High equilibration pressures (100-350 atm) were required for bubble formation in most species, except for megalopa and adult crabs (3-10 atm argon).
• Limb movement significantly influenced bubble formation in crabs, while hydrostatic compression and slow compression did not.

Conclusions:

• Circulatory systems, musculature, and lipids do not solely determine susceptibility to bubble formation.
• Bubbles do not necessarily originate from pre-existing nuclei.
• Tribonucleation is a likely cause of bubble formation in certain crustacean decompression scenarios.