Fisheye is nothing but "source code repository" ad crucible is nothing but "code review" .
FishEye is a tool of indexing your source code repositories and provides charts and information about it. You can browse the full source in the web interface and do full text searching, just to name a few features.
More information is available at https://www.atlassian.com/software/fisheye
As you mention, Crucible provides the ability to do code reviews. More information at https://www.atlassian.com/software/crucible
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