Aside from field observation, is it recommended to take samples and observe them from a tank? What environmental factors should be looked into to simulate the most natural environment for the sea snake?
Observation in tanks should be possible but it depends on snake species. For sea kraits it is easy, you should create large tanks with stony caves as hiding places outside the water.
If you have initial information prey to a kind of snakes, one can arrange a stage to which the behavior of capture and swallowing process in a suitable place to make a recording cameras.
for example I know the snakes Micrurus are excellent ophiofagas; M ancoralis is excellent predator of Caecilias, I have seen personally in the field. Then I can arrange a terrarium where the chances of this encounter suits. By cameras (there are a variety of them) you can make images more faithful to this process.
Since its serious work with aquatic animals, serious theory Similarly, in this case a suitable tank therefor. There are well established aquarium and there is only together a list of prey species diversity that involves your diet.
Under natural conditions would be ideal spots where the snakes live, and its associated habitat and from here you can make use of technology as sophisticated cameras - traps. A replacement of these cameras can be used in less sophisticated security and make records via satellite or data transmission systems to get to a data processor.