Taupos Native Species: Lake Taupo’s Original Fauna

Lake Taupo, the massive inland sea of the North Island, boasts an aquatic ecosystem that was historically characterized by a specific group of indigenous fauna. While today the lake is famous globally for its introduced trout, the story of taupos native species provides a fascinating look at New Zealand’s original freshwater biodiversity before human intervention reshaped the environment.

I. The Original Inhabitants of the Great Lake

Before the introduction of European game fish in the late 19th century, the waters of Lake Taupo were home to a limited but specialized group of fish. These taupos native species evolved in relative isolation, adapted to the volcanic chemistry and vast scale of the lake.

The primary indigenous residents included:

• Koaro (Galaxias brevipinnis): Once the most abundant fish in the lake, these slender, agile climbers were a staple food source for local Māori.

• Common Bully (Gobiomorphus cotidianus): A small, bottom-dwelling species that remains a vital part of the lake's food web.

• Longfin Eels (Anguilla dieffenbachii): While present in many New Zealand waterways, their access to the upper Waikato River and Taupo was historically restricted by the Huka Falls.

Koaro (Galaxias brevipinnis)

II. Traditional Māori Fisheries and the Koaro

For the Ngāti Tūwharetoa people, the indigenous fish of the lake were more than just wildlife; they were a critical economic and nutritional resource. The Koaro, in particular, was harvested in massive quantities using specialized nets and traps set at the mouths of the lake's many inflowing streams. These fish were often dried to preserve them for year-round consumption. The abundance of these taupos native species supported a large population and played a central role in the social and cultural standing of the local tribes.

Traditional Māori Fisheries and the Koaro

III. Ecological Shifts: The Impact of Introduced Game Fish

The landscape for taupos native species changed forever with the arrival of European settlers. To create a recreational fishery, Rainbow and Brown trout were introduced to the lake system.

The consequences for the native inhabitants were significant:

• Predation: Trout, being much larger and more aggressive predators, began to prey heavily on the juvenile Koaro and bullies.

• Competition: The newcomers competed for the same food sources, such as aquatic insects and larvae.

• Population Decline: Within a few decades, the massive shoals of Koaro that once characterized the lake began to thin out, drastically altering the traditional Māori fishing practices.

IV. Conservation and the Modern Ecosystem

Today, while Lake Taupo is managed primarily as a world-class trout fishery, there is an increasing focus on the preservation of the remaining taupos native species. These indigenous fish continue to survive in the shadows of the larger trout, inhabiting the stony lake edges and the tributary streams that feed into the basin. Modern conservation efforts aim to monitor these populations to ensure that the unique biological history of New Zealand's largest lake is not entirely lost to the success of introduced species.

By Alina Basics.