What does a bad lobster tail look like?
Considering this, how can you tell if lobster is bad?
The best way is to smell and look at the lobster: signs of bad lobster are a sour smell and a slimy texture; discard any lobster with an off smell or appearance, do not taste first.
Similarly, you may ask, what does bad lobster smell like?
Spoiled lobster will often present itself with an unpleasant ammonia smell or with a soft, cottage-cheese-like consistency. That's the short and sweet. If you detect an ammonia smell in your lobster meat, chances are good that the meat has spoiled and should not be eaten.
Even cooking the lobster meat won't kill all of the bacteria. If Vibrio bacteria end up in your system, it's not pretty. You can experience abdominal cramping, nausea, vomiting, fever, chills, and sometimes even death. Luckily, there's a pretty good way to tell if that meat has gone bad.