Theere are two small bones (a pair) that look like a bean seed in the neck of the fish. Collect 7-8 pieces of that bone, put in a glass containing one fresh lemon juice. Wait for one day and drink it in the morning before eating. You can try this 3-4 times. Said very effective and I will try it mayself. The hardest part is finding the bones. I would appreciate if anybody could help. Sincerely.