our rampant and poorly controlled (or uncontrolled) exploitation of the global oceans is depleting (or has depleted) fish stocks to unsustainable levels. Nearly a third of global fisheries have crashed to date, and it is estimated that global fish stocks will be commercially extinct by 2048.
In fact, the global catch as a whole is declining: so much so that stocks will be extinct within the next few decades
Mitsubishi is hoarding frozen bluefin tuna and is, allegedly, contributing to the extinction of stocks such that their deep-frozen cache will increase substantially in value after the extinction date.
this 'fishing down' the food web means that we are gradually working out each layer of the trophic pyramid; eventually we will be left with nothing but nematodes and algae.
If you really must eat seafood, ensure that what you're eating comes from sustainable sources.
The seas belong to us all, not to those who make money from them.