If you look at shipping movements on marinetraffic.com and zoom up to a global scale, this is what all the shipping on planet Earth looked like today (20-09-2019).
It looks like this every day and every night continuously. No wonder there is a giant floating garbage dump in the middle of the Pacific Ocean? No wonder we now have to farm fish because the oceans are close to fished-out?

But thats not good enough for our global propaganda machines. We need much more shipping and much more growth because we are all in debt.
Do you ever get the feeling humans forgot they invented money so they would not have to carry 4 pigs and 3 chickens to market to trade for something else?

Nothing to do with the Pacific and Atlantic garbage gyres(*). This looks tight in the map above but in reality you have a cargo ship for 100 square miles of ocean (in other words, a tiny bit of a pixel in the whole ship symbol used in the map), and this ship has a fairly small crew (20 people) so even assuming they throw their waste overboard (a couple of pounds/day/person) this is much less than what wind and rain wash out to sea from land dumps.

Overfishing is a major problem, but the map is a poor indication, because it doesn't show the size of the boat and its fishing technique. A small ship using fish pots to catch prawns and a giant trawler are somewhat different for the environment.

The real problem is that the cargo ships and tankers use a very cheap, but very low-grade fuel that emits a lot of toxic fumes. Planes are clean by comparison.

(*) From what I witnessed last time I visited a fishing harbor, the French fishermen catch almost as much garbage as fish in their nets. And they bring back the garbage to land.

Interesting comments ofnuts. If only they were all like French fishermen.
I found the 'Ship Type' chart. You can see where most of the fishing is happening - the South Pacific and Northern parts of the Northern Hemisphere.
No wonder there are so many shark attacks along the East coast of Australia as humans consume the middle of the marine food chain?

Wish each respective country would just buy more internally myself but alas, that won't happen.

Sharks are fished like the rest. It's even worse, they capture them, cut off their back fin (the only part that has a value) and put the mutilated fish back in the water) .

Great white sharks are being tracked with 'acoustic tags' to study their behavior.

They have nurseries and appear to prefer the coastline.
They have to swim continuously to move water over their gills or they suffocate and travel between 2,200 to 3,000km per month.

An interesting question is 'do sharks sleep'?
Apparently only filmed once they enter a catatonic state at night with oxygen rich currents flowing toward them.

"At least one study has indicated that the shark's spinal cord, rather than the brain, coordinates swimming movements. This would make it possible for sharks to swim while they are essentially unconscious."