[Mount Athos]

There is one good dietary source of LPC-DHA.

Fish roe (caviar).

It isn’t found in significant levels in other parts of fish.

[ConservativeMind]

More on roe for Omega-3, here:

https://novoslabs.com/what-are-the-best-omega-3-supplements-a-guide/

Lumpfish roe is the cheapest.