Biotic and abiotic factors work together in the ocean ecosystem. Biotic factors include various fish, sharks, octopi, seals, and other sea life. Abiotic factors are non-living things like water, rocks, coral, and sea shells. These factors interact - for example, some fish need coral reefs for shelter and sunlight to survive. Interruptions to the food chain, like overfishing or pollution, can negatively impact ocean life. The ecosystem is complex with many species interacting in various food chains.