There are many parasites. The negative health effects range from mild to fatal. Commercially processed fish are 'candled', which is a physical inspection and removal of visible parasites. Fish frozen a week or well cooked is generally considered safe.In a survival situation the worms would provide excellent bait. Fish are traditionally prepared by salting,drying and even cold cooked with lime or lemon juice in some cultures.Remember, food isn't the highest immediate priority in survival. Id pass on this sushi until my fire was going.<br><br>