The larvae feed on plankton .
The larvae grow through ten molts into ten further larval stages , the last of which is around 30 -- 32 mm ( 1.2 -- 1.3 in ) long .
The larvae feed on plankton , and grow through ten molts into ten further larval stages , the last of which is around 30 -- 32 mm ( 1.2 -- 1.3 in ) long .