Wetlands are crucial food baskets for NZ’s native eels – new research

Per The Conversation, new research from New Zealand shows that wetlands are crucial food sources for the country's endangered native longfin eels. Scientists studied Waituna Lagoon on the South Island, an internationally important wetland that periodically opens to the sea, allowing īnanga—small native fish that form the bulk of whitebait—to surge upstream. By analyzing growth rings in eel ear bones, researchers found that eels in Waituna Creek grew far faster during years when īnanga were abundant, and the creek now produces roughly ten times the eel biomass per year compared to streams inside New Zealand's conservation estates. The findings suggest a shift in strategy: instead of focusing restoration efforts solely on protecting the target species, focusing on adjacent wetlands that produce high-quality food can fuel recovery across an entire ecosystem. With New Zealand having lost about ninety percent of its wetlands historically, this research points to wetland restoration as critical infrastructure for supporting not just the eels themselves, but entire networks of native fish and bird species.

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