Most of the oxygen we breathe is made by ocean plankton. And when animals left the seas in which life arose, they took seawater with them, in their b… - Carl Safina

Bottom trawls—large bag-shaped nets towed over the sea floor—account for more of the world's catch of fish, shrimp, squid, and other marine animals than any other fishing method. But trawling also disturbs the sea floor more than any other human activity, with increasingly devastating consequences for the world's fish population.

A couple of years ago I was participating as a writing coach in a "sea-mester," sailing 1,000 miles from Hawaii to , while students from Stanford University received lectures and closely supervised instruction and conducted independent projects on high-tech oceanography. These were smart kids, and the professors were superb. Five hundred miles from land, we got into a discussion on whether the ocean is a "wilderness." The consensus: Obviously it is; there was no sign of humanity, not another boat in sight. Everyone savored the thought: wilderness!
But, I reminded everyone, we haven't caught a single or seen a or a . Wilderness? I don't think so. If the were covered with water, you wouldn't see that the buffalo were gone, either. There is no ocean wilderness. The whole ocean feels our effects, through fishing, pollution, dying s, , immortal plastics, oxygen-asphyxiated s, , and .

When two sympatric, closely related species appear to have very similar needs, we may ask whether mechanisms exist that enable them to avoid direct competition. Implicit in this questions the presumption that two species with identical requirements cannot coexist (Gause 1934).