"boats are aquatic vehicles"; "water lilies are aquatic plants"; "fish are aquatic animals"
is similar to
native to or inhabiting the sea
"marine plants and animals such as seaweed and whales"
is similar to
partially aquatic; living or growing partly on land and partly in water
"a marginal subaquatic flora"
is similar to
growing or remaining under water
"viewing subaqueous fauna from a glass-bottomed boat"; "submerged leaves"