An exemplary member of a Piscine Magistrate's sub-harem; a collection of fertile females used for the sowing of seed as opposed to serving a directly pleasurable role in the prima harem. A swarm of eels harass the brood mermaid in her later stages, eager to snatch up freshly hatched young. These swarms are encouraged by most Magistrates as they consider it an excellent measure for thinning the weak offspring; immediately setting the stage for a strong and culled lineage. Brood mermaids are often given as donativum profundi, "imperial largess of the abyss", to honoured guests, as the reciprocated offering of offspring is considered an assumed display of trust in important dealings amongst piscines of high standing.