1) Marine science 2) Sea science 
• (n.) That branch of science which relates to the ocean.
O`cean·ol'o·gy noun [ Ocean + -logy .] That branch of science which relates to the ocean. 
Oceanology is the study of the sea, especially of its economic geography.
oceanology 1. The branch of oceanography that studies how oceans may be used for economic or technological purposes. 2. The explorations and scientific studies of the ocean and its phenomena.