Frequently Asked Questions

What is a fish ladder?

A fish ladder (or fishway, fish pass) is a structure designed to allow fish the opportunity to migrate upstream over or through a barrier to fish movement.

Why do we need fish ladders?

New Zealand's freshwater fish are part of our natural freshwater ecosystem. They are a traditional food source and an important part of our recreational and commercial fisheries.

Many of our native fish species need to migrate between freshwater and the sea during their life. Their survival depends on it. Fish like whitebait and elvers (young eels) swim up rivers from the sea. They must pass through culverts and over weirs on their journeys. Other freshwater fish, such as the introduced trout, must also be able to move upstream to spawn. Poorly installed culverts or weirs that restrict fish passage will reduce the amount of habitat available for fish, causing a decline in fish numbers.

What is a Fish Way Baffle?

Fish Way baffles are a must for any culvert pipe to assist fish in their journey upstream to reproduce. These baffles slow water down and raise the water levels to at least 100mm on a low flow. Fish can live within these baffles protecting them from predators and migrate through them on their way upstream.