WRAPUP 3-Bank of Canada sees no need now for money expansion

* BoC says no immediate plans to expand money supply

* Markets surprised, Canadian dollar and bond yields rise

* Any additional easing to be announced on fixed dates

* Recession worse than expected, some positive signs

* G7 countries slow in dealing with toxic assets (Recasts, updates throughout with Carney's comments)

By Louise Egan

OTTAWA, April 23 (Reuters) - The Bank of Canada stunned markets on Thursday with a go-slow approach to injecting additional stimulus into the slumping economy after cutting its benchmark interest to almost zero and predicting the biggest first-quarter contraction on record.

While encouraged by central banks' successful efforts in the United States, Britain and elsewhere to buy securities and thus expand the money supply, Canada signaled it would not follow suit before June -- and maybe not even then.

The Canadian central bank unveiled a framework for quantitative easing, or creating money through purchasing financial assets, and credit easing, which involves help for targeted private-sector credit markets.