There are warning and safety sign boards for most of the marine national parks but very few documents supporting them. 

Recently even outside marine national parks in the Andaman islands have been put up after crocodile attack on swimmers..

Good luck

Deepak 

You will find information on visitor signs and leaflets of the Marine Reserve at La Réunion, southwestern Indian Ocean, using the following link:

http://www.reservemarinereunion.fr/lareserve/la-reserve-naturelle-marine/reglementation

There you will also find a contact address for further information.

Hi, as an erstwhile park ranger, it is my experience that visitors do and do not read signs, and sometimes deliberately ignore signs. This is for a number of reasons: a general obedience; not paying attention; deliberate disobedience. Paris need to be adequately policed, it is the only method of ensuring park safety and environmental integrity.

Hi Heather,

Based on my experience in observing tourist and animal interactions, some tourists are not aware of warning sings. However, many tourists ignore signs even when park rangers are present. I don't think warning signs alone will completely eradicate undesired tourists behaviors, but there may be more effective ways to discourage tourists from engaging in such behaviors. There is a study conducted by Kratochvil & Schwammer in 1997 titled, "Reducing Acoustic Disturbances by Aquarium Visitors." Though their research was done in aquarium, they discussed the effectiveness of the warning signs. You might be interested in reading it. ;)

[Kratochvil, H., & Schwammer, H. (1997). Reducing acoustic disturbances by aquarium visitors. Zoo Biology, 16(4), 349-353.]

Although we have not specifically studied this question, from my experience we have very low compliance with warning signs. Visitors either don't see them or ignore them. I believe that Yosemite National Park may have completed a research project on this subject.

Interesting to read about warning signs. Must be something of the new world. Here in Namibia and Botswana I walk (unarmed) leopard, lion, baboon and elephant territory without ever meeting (or obviously needing) a sign. Same in for a NP in Italy (see my profile) in bear and wolf contry. Some of my Asian students get nervous, but Africans, Europeans or my children not.

Only at beaches, I have seen warning signs in this part of the world. For sharks.  

My hypothesis on the why of warning signs for animals at NP entrances is that the signs are erected to avoid liability for damages by parks, rather than warn visitors.

Another reason could be that the migratory large carnivores and herbivores are hunted (legally or illegally) around here or kept at bay by herders with dogs (Majella) and  therefore avoid human beings. In effective NPs you can observe that animals tolerate human beings at much shorter distances than outside the NP.

In many East African NPs with the big five walking without armed guard is prohibited. Luckily, this is still your own decision  in several places around here and Europe.