Until 1945 in Sydney, fish was sold by licensed fish agents at the Haymarket fish market. In 1945, the New South Wales government transferred the marketing of fish to a Government Department and had a regulated system for selling fish from Sydney. Co-operatives also marketed fish outside of Sydney. In 1966 the regulated markets moved from Haymarket to the present location.

Photo: User Jnpet on Wikimedia. Free use subject to attribution under Creative Commons licence
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In 1994, the fish marketing system was privatised with total deregulation occuring in 1999.
The NSW Government announced in November 2016 that the market would move to a new site, so get in quick to hook up with this cache.