Causes of keratitis include: 1  Injury. 2  If an object scratches the surface of one of your corneas or penetrates a cornea, keratitis without an infection may result. 3  In addition, an injury may allow bacteria or fungi to gain access to the cornea through the damaged surface, causing infectious keratitis.
There are 5 species of stonefish that can be found in the coastal regions of Indian and Pacific oceans. Some species of stonefish live in the rivers. Stonefish lives close to coral reefs and underwater rocks. It often lies buried in the sand in the shallow water.
They are colloquially called crawfish or crawdads. Most species of crayfish live in freshwater. All of them play a significant role in the environment, keeping it clean and serving as a food source for birds and other aquatic animals.rayfish are small aquatic creatures, approximately one to six inches in length. They take on a muddy green, yellow or red colorâsometimes even black. There are 540 species of crayfish worldwideâabout 400 of these are found in North America.