Good Morning Sunshine!

My search for monogamous fishes turned up this interesting behavior in seahorses which I thought was just too cute not to share. Now I'm not exactly what you would call a "morning person" and would prefer not to engage in any complex social interactions before a certain hour, but this is not the case for a family (Syngathidae) of fish which includes seahorses and piepfishes.  In these species the male fish has a brood pouch where he fertilizes and incubates the embryos for two weeks to a month.  Seahorses maintain stable pair bonds over the course of the breeding season and appear to be monogamous.  One way pair bonds are maintained and reproduction is synchronized is through morning greetings.  Males and females each have their own partially overlapping territories and every morning just after dawn the pair will meet at the spot where they last spawned and "change color, promenade and pirouette together" according the project seahorse website then they will part for the day, each to do their own thing.  They keep this up every morning that the male is pregnant and then after the male gives birth they spend up to 9 hours together dancing and courting after which they mate and the whole process begins again.

Vincent, A. C. J. (1995) A role for daily greetings in maintaining seahorse pair bonds. Animal Behaviour. 49:258-260.