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.
Introduction. An anal fissure is a tear or ulcer (open sore) that develops in the lining of the anal canal. The anal canal is the last part of your large intestine, located between your rectum (where stools are stored) and the opening in your bottom through which you pass stools.nal fissures are most commonly caused by damage to the lining of the anus or anal canal. Most cases occur in people who have constipation, when a particularly hard or large stool tears the lining of the anal canal. Other possible causes of anal fissures include: