Scientists make rare find in Auckland streams

Freshwater fish scientist Dr Cindy Baker and environmental chemist Dr Mike Stewart, both from NIWA,developed a pheromone sampler that detects the presence of lamprey (kanakana/piharau) in freshwater, an important taonga species for Maori but now believed to be in decline. Lamprey, which use pheromones to locate suitable spawning sites, are thought to be extremely rare in the Auckland Region.
The samplers, which absorb pheromones going past in the water column, were placed in 12 streams across Auckland but the Piha and Glen Esk streams in the Waitakere Ranges were the only two streams to return positive results.

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