Some 230,000 recorded so far
It they are unknown how would we know if they are unknown
There are thousands of fishes in the ocean... There are too many too name
One species adapted to all the worlds oceans
approximately 9000 [ that feed on bacteria ] .
There are over 950 species in the class Echinoidea, which includes sea urchins and sand dollars. These species are found in oceans around the world, inhabiting various marine environments.
There are many different species of sharks in our oceans. Each breed has a different expected length of life.
Different species Jellyfish can be found in all the oceans across the world. == ==
There are speculations that 10 million species have already been found. However it is though that we still don't know about 90 % of the species. These species live in places which are inaccessible to humans like deep oceans, high mountains, etc.
There are no oceans in Alaska, it is surrounded by two oceans, the Arctic and the Pacific Oceans.
In the oceans and Amazonia
Last time I checked, Antarctica is a land mass. While whales are mammals, they live in the oceans. Simple geography fail.
In tropic seas and oceans there are many phosporescent species of plankton and this is what the passage concerning Simon being washed out to see mentions.