1. Marine Environment and their Divisions 
2. Life in Oceans: Major Group of Phytoplankton 
3. Life in Oceans: Major Group of Zooplankton
4. Seaweeds
5. Seagrasses 
6. Environmental Factors Affecting Life in the Ocean 
7. Vertical Migration of Zooplankton
8. Phytoplankton and Zooplankton Relationship
9. Primary Productivity
10. Seasonal and Geographical Variations in Productivity
11. Plankton and Fisheries 
12. Intertidal Ecology: Rocky Shore 
13. Sandy Shore 
14. Muddy Shore 
15. Mud Banks 
16. Coral Reef Ecosystem
17. Mangroves 
18. Salt Marshes
19. Estuarine Ecosystem 
20. Nekton 
21. Boring and Fouling Organisms 
22. Bioluminescence Organisms
23. Harmful Algal Blooms (HABs)
24. Benthos 
25. Deep - Sea Biology