Inspired by the film "Lost in translation"
Though this takes place underwater and its inhabitants are sea creatures, none of them are shown swimming.
This contains almost no dialogue, with the exception of the cold open and the final few seconds.
Bojack is warned that a thumbs-up is an insulting gesture underwater (which leads to the failure of his attempt to hitchhike). This is true in several parts of the real world.
As shown in the episode, it is true that it is the male seahorse who gives birth.