WHERE do fish look when they are locked in an elevator together?

It is a question that will remain a mystery for a little longer, says the Sydney Catchment Authority's senior environmental manager, Tony Paull.

Enticing... the Tallowa Dam lift. Credit:Jon Reid

Even so, elevator etiquette was a crucial consideration for the state's first ''fish lift'' officially opened yesterday by the state's Water Minister, Phil Costa.

"This new fish lift is the largest of its kind in Australia and a direct investment into improving the health of this vital river system," Mr Costa said.