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More than 20 members of the Tautuku and Green Island fishing clubs, Otago Salmon Anglers and Salmon City supporters helped liberate the fish from the Sawyers Bay Hatchery.
The smolt were transported from the hatchery in a specially converted mini-tanker to six sites in the Water of Leith and Lindsay Creek.
''We're trying various sites around Dunedin, so they don't get overcrowded,'' New Zealand Salmon Anglers Otago branch chairman Wayne Olsen said.
''If we concentrate them all in the same area, they'll take off to sea. This way, they stay in the Leith catchment for at least 48 hours, which means there's a better chance of them imprinting and returning to the Leith sites.''
The trust plans to release more than 220,000 smolt this year, as it bids to establish Dunedin as the ''Salmon City'' of New Zealand.