The monitoring of the fish community present in the green filters and constructed wetlands channels allows to know in detail their abundance, size and seasonal and spatial variations. During the follow-up conference, various fish species and crabs were captured. However, also other aquatic organisms were found, such as water snakes and tortoises present in these places.
Once all the necessary information is registered in the various capture points, all fish, amphibians and native reptiles are released back into the environment. Not the same is happening with exotic species. Not surprisingly, alien species are the second greatest threat to biodiversity conservation, just behind habitat loss. Therefore, if we apply the law on biodiversity and invasive alien species, the removal of these copies is no longer a decision, but has become an obligation. Especially when we bear in mind the recovery of the Albufera in a good ecological state, which indispensably means that we need to reduce the pressure of alien species on the native biodiversity.
Although the real utility of the non-realease of American crayfish, perch soles, gambisias or small copies of tents and carpines might be questionable, occassionally fishermen leave us copies of large dimensions.
It is precisely these individuals that are the most damaging to aquatic biodiversity, based on the recovery of the aquatic ecosystem. These individuals, with their movements on the substrate, resuspended solids, cloud the water, uproot young stems of underwater plants while exerting significant predation pressure on native aquatic fauna (dribblings, Samarucs or fartets and accounting for macroinvertebrates which serve as food for various waterfowl species).
Undoubtedly, monitoring of fish becomes a powerful tool for the management and conservation of these areas, making it possible to act locally and direct the development of the Albufera in the direction of recovery of its proper ecological status and conservation.