Cardinal Shrimp

The cardinal shrimp is one of the most striking freshwater invertebrates in the hobby: a deep blood-red body scattered with bluish-white spots and tipped with pale 'socks' on its walking legs. It is a true miniature, with adults barely passing 2.5 cm. The species is endemic to Lake Matano on the Indonesian island of Sulawesi, an ancient lake that has been isolated for millions of years, and it was only described by science in 2009 after an expedition backed by the German company Dennerle, whose name it now carries.

This is not a beginner animal. Lake Matano is warm, alkaline and remarkably stable, and cardinal shrimp expect the same at home: around 26 to 30°C, a pH of 7.5 to 8.5, and hard, mineral-loaded water with no sudden swings. Most losses happen when keepers treat them like ordinary dwarf shrimp or rush their acclimation. A mature tank with rock, biofilm and plenty of grazing surface suits them best, ideally a single-species setup where the water can be tuned exactly to their needs. They themselves are peaceful and shrimp-safe, picking quietly at detritus and microfauna across stone and substrate.

Unlike Amano shrimp, cardinals breed in plain freshwater. Females carry a small clutch of relatively large eggs that hatch straight into fully formed miniature shrimp, with no free-swimming larval stage, so a settled and well-fed colony will slowly grow on its own. That captive breeding now matters well beyond the hobby. The IUCN lists the species as critically endangered, and it has not been recorded in the wild since 2013 after mining pollution, dams and introduced fish took over Lake Matano. Choosing tank-bred stock instead of wild-caught keeps the pressure off whatever natural population may remain.