Organism associated with fish consumption and also causes carcinoma gallbladder:-

Clonorchis sinensis Clonorchis sinensis is a liver fluke, acquired by ingestion of raw or inadequately cooked freshwater fishes. In human body, it lives within bile ducts and causes inflammatory reaction leading to cholangiohepatitis and biliary obstruction. It is well known risk factor for cholangiocarcinoma It is a rare, but mentioned risk factor for carcinoma gallbladder.