This tune is the Gan Ainm tune on track 8 of Jerry O’Sullivan’s recording, ‘The Invasion’.
This is Astralian Water: https://thesession.org/tunes/2607
I have this tune from the Skylark album "All of It". The liner notes state:
"Vincent Campbell from Mennahalla, Co. Donegal is the source for the first jig. Vincent had it from Jimmy Lyons another Donegal fiddle player. Jimmy called this tune ‘Australian Waters’. However, it is known as ‘Dewdrops on the Corn’ in other parts of the country."
Even though the two tunes are related "Australian Waters" is obviously very different.