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Experts identify these worms as round worms (Anisakis spp.), common fish parasites that can sometimes be seen on sashimi. Marie Tan, a fish disease specialist, explains that these are cylindrical, whitish worms less than 2 centimeters long, often curling inside the fish's flesh or muscle. They are naturally occurring parasites that use fish as hosts, but their lifecycle involves multiple steps, starting from eggs laid by adult worms in the intestines of marine mammals like dolphins, which are then excreted and hatch into larvae that swim freely in the ocean.