Tx for asking, because I've been chowing anthelmintics for 1.5 years and am still producing much of this stuff when I eat fenben. They seem like liver/intestinal flukes to me (based on layman google searches), but sometimes I see people refer to this stuff as mucoid plaque, too. Those who do, seem to regard the plaque as more dangerous than parasites, anyways.
My diet included sushi and cebiche daily for years; and other years I ate hundreds of meals prepared by villagers in the high Andes as well as the Amazon Basin. Natural Calm Mg Supplement pulverizes all food in me, so my stools are just liquid and about 5 of the things from your photos floating on top, sometimes with some "tomatoes peel tubes" mixed in too. Have you had similar food exposures OP?