The study looked at how different salt levels affect the ability of Hydroides ezoensis larvae to reproduce, hatch, survive, and grow. They found that the larvae had the highest chance of reproducing and hatching at a salt level of 35, with the best survival and growth rates at a salt level of 32. Lower salt levels had negative effects on these processes, while very high salt levels also reduced survival and growth. Overall, the best salt levels for the larvae to thrive were between 30 and 35 for reproduction, and 32 for hatching, survival, and growth.