Comb-like peaks in frequency spectrum
Your signals look quite similar to vowel signals - in which a periodic pulse train is filtered by a resonant filter.

I suggest you to look into AR modelling to decompose your signal into a residual, and a set of AR coefficients. The spectrum of the residual will give you the "pulse train" component of your signal (a sharp peak every time a bubble is produced) ; while the frequency response of the all-pole filter associated with the set of AR coefficients will contain information about the sound of each bubble. The 167 Hz peak you are looking will be easy to spot on the later.