Ημερολόγιο της/του mskimh

Is there a way of identifying fish from the egg sac or larva? I have found all sorts of colours & shapes washed up on the beaches around Western Port Bay. I've never noticed these before.

Some useful websites for identifying items on the shores of Western Port, Victoria, Australia

https://portphillipmarinelife.net.au
https://seagrass.com.au/discover-western-port/regional-flora/seagrass-species/