Consider the following statements related to the Dugong:

1. Dugongs are the only herbivorous mammals found in India’s marine ecosystems.

2. Dugongs primarily inhabit deep ocean waters far from the Indian coastline.

3. Dugongs are listed as Vulnerable in the IUCN Red List and are protected under Schedule I of the Wildlife Protection Act, 1972.

4. Dugongs reach reproductive maturity at around 9 to 10 years and have a slow population growth rate.

5. Gulf of Mannar Marine National Park is known for the presence of dugongs.

How many of the above statements are correct?