About 1000 eggs (sometimes up to 4000 eggs) are laid after dusk in a frothy foam which floats conspicuously on the water, and is about 10cm in diameter.
(About 1000 eggs (sometimes up to 4000 eggs; are laid; T:after dusk) (a frothy foam; floats conspicuously; L:on the water) (About 1000 eggs (sometimes up to 4000 eggs; is; about 10cm in diameter)
About 1000 eggs (sometimes up to 4000 eggs a frothy foam About 1000 eggs (sometimes up to 4000 eggs
are laid floats conspicuously is
T:after dusk
L:on the water
about 10cm in diameter