Project Title: Combating Invasive Alien Species in Croatia

Project Commencment Year:

Status: Active

Species: Biodiversity Conservation

Invasive alien species pose a significant threat to the natural environment, with far-reaching ecological, economic, and public health consequences. Human activity has led to the introduction of numerous non-native species into ecosystems where they disrupt biodiversity and endanger native species. In Croatia alone, over 900 invasive plant and animal species have been identified. Among the most concerning are the red-eared slider turtle and various invasive fish species, which jeopardize the delicate balance of ecosystems such as those in Plitvice Lakes National Park.

Zagreb Zoo plays an active role in the prevention and control of invasive alien species through two key initiatives: the Acceptance Center for Red-Eared Sliders and the removal of invasive fish species from Plitvice Lakes.

Sanctuary/Center for Red-Eared Sliders (Trachemys scripta)

In June 2023, Zagreb Zoo was officially designated as a Sanctuary and Acceptance Center for Red-Eared Sliders, a highly invasive turtle species subject to regulatory oversight. These turtles often enter the environment after being released as unwanted pets and pose a serious threat to native ecosystems.

The Center’s primary goals include the adoption and care of surrendered turtles and the housing of retained individuals in secure, controlled environments to prevent further spread and reproduction. Relocating these turtles from natural areas like Maksimir Park and the Botanical Garden helps reduce their environmental impact while supporting conservation efforts.

Through educating citizens about responsible pet ownership and the consequences of releasing alien species into nature, we contribute to preventing the introduction of new individuals into the ecosystem. Ongoing efforts to expand the Center’s capacity—such as improving infrastructure for temperature control and creating nesting sites—ensure we can provide proper care and effectively manage turtle populations over the long term.

Removal of Invasive Fish Species in Plitvice Lakes National Park

At Plitvice Lakes National Park, a protected natural reserve renowned for its rich biodiversity, native fish species face a growing threat from invasive species such as the chub and redfin perch. These non-native fish pose a serious risk to the survival of indigenous species, including the Danube salmon and the two-banded bream. To help restore the park’s natural ecosystem, systematic efforts are underway to remove these invasive species from its lakes and rivers. At the same time, initiatives are being implemented to support the recovery of native fish populations, particularly the Danube salmon.

The Zagreb City Zoo is actively supporting this vital conservation project by sharing expertise, offering practical assistance, and contributing to the removal of invasive fish.You can read more about the project at: https://np-plitvicka-jezera.hr/izlov-alohtonih-vrsta-riba/

Summary:

Zagreb Zoo is actively involved in efforts to combat invasive alien species through initiatives like the Center for Red-Eared Sliders and the removal of invasive fish from Plitvice Lakes National Park. These projects aim to protect biodiversity and raise public awareness about the harmful effects of releasing non-native species into the wild.