Marine stickleback populations live and breed strictly in the ocean. Sea-run stickleback fish are. anadromous, meaning that they are born in fresh water, spend most of their lives in the ocean, and. return to fresh water to breed. Freshwater stickleback fish live entirely in fresh water.
Among patients with Crohn's disease, 4% will have an anal fissure as the first manifestation of their Crohn's disease, and half of all patients with Crohn's disease eventually will develop an anal ulceration that may look like a fissure.
Full Definition of FISSURE. 1. : a narrow opening or crack of considerable length and depth usually occurring from some breaking or parting.2. a: a natural cleft between body parts or in the substance of an organ b: a break or slit in tissue usually at the junction of skin and mucous membrane.. : a narrow opening or crack of considerable length and depth usually occurring from some breaking or parting. 2.