Invasion

These are the eggs of the golden apple snail. This species is considered to be in the top 100 of the "World's Worst Invasive Alien Species”
They are voracious eaters of aquatic life and are quite hardy when it comes to climate and temperatures. Unfortunately they have invaded the lake near our house.
Two positives are that the birds seem to be eating a lot of them because the shoreline is littered with snail houses.
They are also edible. In Thailand the snails are cleaned and parboiled. They are then taken out of their shells, cut, and cleaned in salted water.
After rinsing with water, they are mixed with roasted rice, dried chili pepper, lime juice, and fish sauce, and then eaten.

Sources: Wikipedia and me