Where I used to work, we had a 7 day on both fresh and salt water, but you needed to bring the body and a water sample back for testing. If the animal clearly looked beaten to death, it was void, but we were pretty generous on it. We also didn't sell saltwater fish for 24 hours after arriving...you could probably get it, but there would be no warranty. I don't think most other stores had any warranty. In general, our prices where higher, but the guarantee was much better. Other places- well- you could have a fish die as soon as you walked out the door and I am not sure they would care.