no
starfish, plankton
Plankton are not crustaceans, but are microscopic organisms. Crustaceans such as crayfish, shrimp, lobsters, crabs and krill feed on plankton.
Lobsters eat many variety of plankton. They are also known to eat crabs, sea urchins, sea stars, and small fish.
CATERPILLAR
No, reptiles do not have a larval stage. Unlike some amphibians and insects, reptiles hatch from eggs in a form that resembles miniature adults. They do not undergo metamorphosis like amphibians that have larval stages such as tadpoles.
Yes they do.
planula
No, platyhelminthes do not have a trochophore larval stage. Trochophore larvae are typically characteristic of marine annelids and mollusks. Platyhelminthes have a diverse range of reproductive strategies, but they do not generally exhibit a trochophore larval stage in their life cycle.
a grub
I do, but in the ocean everything almost eats everything else, so the easy answer is not plankton or fish smaller than crabs and lobsters.
It grows the most at its larval stage (caterpillar)
The Larva stage of a bee is called grub. .