DNA in samples of Ocean Water

Now with the use of new technology only small amounts of water are needed to run tests for the DNA of any target species. For example, the rare sawfish (pictured below) can have its location be identified by testing the sample of only some water. The test is called an eDNA test and is making waves in the area of natural sciences. Professor Colin Simpfendorfer who created this method says this can replace older methods like fish surveying which is time consuming and expensive.

https://www.sciencedaily.com/releases/2016/08/160809095011.htm