In saucepan melt margarine; add onion and saute over medium-high heat, stirring , until onion is softened, about 5 minutes.
Sprinkle flour over onion and stir quickly to combine. Stir and add 1 cup water, the clam juice, and tomatoes.
Reduce heat to medium low and cook until mixture thickens, about 5 minutes.
Add remaining ingredients except salmon and stir to combine; cook until potato is tender, about 10 minutes, add salmon and cook until opaque, about 5 minutes longer.
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