Do your own search
You may search for more information here. Kiddle is a search engine, which works like Google for children. World Book Kids is an encyclopedia that will give you short articles on your topic. The websites below all have information on many different creatures.
Websites where you can search for your sea creature:
Enchanted Learning- Scroll down the page to find creatures listed in A-B-C order.
Intertidal Zone Animals--Enchanted Learning