The marsh is a greenhouse with high plant productivity. In addition to salt marsh plants, phytoplankton, comparable to prairie grass, is at the start of the food chains.
It develops marvelously in coastal marshes, because, in addition to the carbon dioxide essential to the prosperity of plants, the three elements (nutritive mineral salts, light energy and temperature) necessary for life combine as well as possible.
Thus, during the 3 or 4 hours when the White Sea is full, the plankton develops and, at low tide, it will enrich the coastal waters. The marsh is a well-stocked "self-service".
During the rising tide, it is feeding time for the zooplankton which comes to "graze on the floating meadow", but also for the cephalopods (squid, cuttlefish) or the young fish (sardines, anchovies, mackerel, etc.) which also eat both phytoplankton and zooplankton.
Flatfish, mullets, sea bass or sea bream also find their happiness, at ground level, feeding on all the fauna that comes out of the sand or mud as soon as the sea arrives.
The swamp is a shelter. The fry are in the salt channels where they rise with the tide. The risk for them is to get stuck at low tide in a pond that is too small. The many birds present on the site will then be formidable predators.