This week we traverse the murky depths to find the child of mermaid and arapaima. Who does this child most take after, the mother or the father–and which is which (mermaid and arapaima)? Where does this child live? Can it survive in the ocean? Can it survive in the river? What does this child eat on a regular basis? What would it have as, say, a birthday or anniversary meal? With whom would the child celebrate?