When you are making strides to understand your capabilities and feelings, the dream setting will involve water, which can represent feelings and what lies hidden 'below the surface.' Fish are a representation of your potential for new life and can also represent opportunities. When the fish appears threatening, you may be uncomfortable with your own anger or the power of expressing your full capabilities. If you are being attacked by a shark, the dream can be blending a message about the need to feel (blood) your feelings (water) in order to achieve your potential (fish.) See also Sealife.