There is no sign of haga rave, nor of rising 'fishes' following Hanga Te Pau, in the Tahua text:

Ab1-13 Ab1-14 Ab1-15 Ab1-16
Ab1-17 Ab1-18 (730) Ab1-19 Ab1-20

An empty shell contains no germ of future life, it is not like a 'fist' with 'fingers' inside waiting to be 'counted'. It just whispers of life that was. Different glyph types tell different stories.

Empty paua do suggest, though, the pau in Hanga Te Pau.

"Paua or pāua is the Māori name given to three species of large edible sea snails, marine gastropod molluscs which belong to the family Haliotidae (genus Haliotis), known in the USA as abalone, and in the UK as ormer shells ..." Wikipedia