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.
The difference is saltwater fish tend to live in environments where there is salt available in the water (oceans) and freshwater fish live in environments that lack in salt(ri â¦ vers, ponds, streams).There are also a number of biological and physiological differences relating to water and salt retention and excretion.he difference is saltwater fish tend to live in environments where there is salt available in the water (oceans) and freshwater fish live in environments that lack in salt(ri â¦ vers, ponds, streams).