Pisces by fish. If poisoning is caused by poisonous fish, the following signs are vomiting, a complete and in -depth headache, thirst, a sense of fear and even cramps. If the patient was poisoned by fish conservatory, first gags appear, then diarrhea. At the first signs, you need to cause vomiting, give a laxative and put an enema with chamomile or a pair of tablespoons of castor.