I can come across a little unforgiving when this topic comes up for discussion, so apologies if I sound like a raving banshee
No one wants to fall out with anyone over this and I'm certainly not trying to wind anyone up or make anyone look silly ... however it is a fact that species have become extinct within geographical areas due to commercial fishing and I'm not just talking about the collapse of the fishing stock or individual species becoming not viable to fish commercially.
By geographical limits I'm not talking about individual bays or stretches of coasts either, but entire seas or even oceans. Two recent examples off the top of my head. Firstly the Angel Shark was declared biologically extinct in the North Sea due to commercial fishing. Secondly the Oceanic White Tip was declared biologically extinct in the Gulf of Mexico due to commercial fishing and that was just a bycatch fishery and not even a targeted one. Unfortunately the list goes on and on and on and when you add on marine mammals the number increases yet again as we have had seal, whale and dungong extinctions due to commercial fishing.
Species like Cod are more resistant and despite massive targeted fisheries I think you are correct in stating that they have not been declared extinct due to commercial fishing. However when a targeted fishery collapses it very often never returns. Off the top of my head within UK waters we have had Cod, Sardine, Pilchard, Herring and Haddock fisheries all collapse and never return. Move onto other areas and target them there and eventually you will drive them to extinction. Like I said in my previous post we are running out of 'next targets'.
I'll sign off now, but I hope no one has taken offense. Personally I blame Steve for bringing the topic up and Sri for posting that video in the first place!!