Yes
Slugger the Sea Dog is a seal. There are a huge variety of seals but the Slugger version seams to be a leopard seal or a fur seal because of its gray coloring.
It's not a metaphor, because it doesn't explicitly say that women are fish. If the phrase was "Women are fish, and there are more of them in the sea", it would be a metaphor. Though, it is a 'Figure of Speech'.
A sea of fish
Her eyes were the sea.
Sea Lions are gray
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Metaphor
the sea; a forest of pines
A metaphor for the word "hostile" could be a stormy sea, representing turbulent and threatening conditions.
A metaphor is when you say something IS something else for E.G "Sea of grief - How and where does one come across a sea that is filled not with water, but with grief?"
Yes
A ship is a slow stroller in the sea.