Marine bacteria are microscopic organisms found in oceans and seas. They play a crucial role in the marine ecosystem by breaking down organic matter and recycling nutrients. These bacteria contribute to processes like decomposition and nitrogen fixation, which are essential for maintaining the health of marine environments. There are thousands of different species of marine bacteria, each adapted to specific conditions in the ocean. Some thrive in deep-sea environments, while others are found in coastal areas. Marine bacteria also interact with other marine life, including phytoplankton and zooplankton, forming a vital part of the ocean's food web.