The shrimp population will decrease
It seems that it can. I myself get tender pimple-like spots on my cheeks after eating salmon, and have decided that I shall quite eating salmon. It is likely that the fish (most often cultivated) has too many contaminants, and probably depending on what animal feed it has been fed and grown on. Ask around, and you will find many persons have attributed their rash to a marinade or sauce when it is in fact the salmon itself that is the culprit.
Nothing will happen to someone eating ice except urinating alot. However, eating ice is a sign of an iron deficiency.
You can starve to death, most likely, you'll die
If you are serious about this, move the question to biology/human physiology.
The planet? Likely it would recover from human destruction eventually.
A "jack salmon" is actually a pike like Perch fish, not a salmon at all
you would be winning
Salmon is an angle of god.
When the group people who are subject to some authority feel that their fundamental human rights are being usurped the rebellion is likely to happen in the society where these people are living.
The zombie apocalypse can happen at any time of the day. With all the drugs that are out in today's society it can happen today or tomorrow of the next day and so on. Because of these drugs in can make you change so if you see anyone such as a human eating another human contact the police immediately.
I dont think it is likely to happen.
If you ate human poo, (which you shouldn't) you would most likely get very sick.