The Neotropic Foundation, the sole conservation hub for unique species in the Canary Islands, has released eight individuals of Anguilla anguilla (European eel) into the ponds of García Sanabria park in Santa Cruz de Tenerife.
The city council initiated this scheme to eliminate the presence of River Crabs (procambarus fallax virginalis) in the park’s ponds, as this species is invasive to the indigenous flora.
In September 2023, a number of these creatures (presumably set loose) were discovered in the same vicinity. Faced with this infestation, the Neotropic Foundation stepped in to capture the identified specimens, ultimately gathering over 400.
One of the risks associated with these creatures is their prolific breeding, with females capable of laying up to 700 eggs. “There are still specimens remaining, posing a threat to the park’s ecosystem, so we are hopeful that this initiative will yield positive outcomes,” mentioned Carlos Tarife, the Councilor for Animal Welfare.
Moreover, the mayor has requested the authorization for installing surveillance cameras in this park area and at the Flower Clock, which is frequently vandalized.
The Choice of Eels
The president of the Neotropic Foundation, Jaime Urioste, clarified that the released eels are endemic to the island’s ravines and only reproduce at depths of 800 meters, hence serving as natural predators by consuming the larvae before they mature.
The European eel is a safeguarded species and poses no threat to humans. Initially, the plan was to release 50 individuals, but it was eventually decided to introduce eight larger ones to effectively manage the advanced crab stages.
The Neotropic Foundation will conduct periodic surveys to monitor the status of both species. If a decline in crab population is observed, the eels will be relocated back to the Foundation. Conversely, if more eels are required, additional releases will be considered.
