Marine ecosystem :
Characteristics 
Are among of earth's  aquatic ecosystem . Examples include salt marshes , intertidal zones estuaries,  lagoos , mongroves , coral reefs , the deep sea and the sea floor . They can be contrasted . Supports the animal life and vice versa . See the food chain 

Food chain :  large shark > mahi mahi >mackerel>small fish> zooplankton > phytoplankton :

INTERACTS WITH HUMANS :
Negatives 
Humans living near the coast have probably always used the ocean as a source of food  . Fishing was probably the first use of the ocean by  humans in the comercial fishing have restulted in the over exploitation of many fish stoks.