Bluestreak Cleaner Wrasse

The Bluestreak Cleaner Wrasse is one of the most ecologically important fish on coral reefs worldwide, performing a vital role by removing parasites, dead skin, and mucus from other fish at established cleaning stations. Its slender body features a distinctive black horizontal stripe running from the snout through the eye to the tail, bordered by a vivid blue upper body and white to pale blue underside. Growing to approximately 4 inches, this small wrasse is instantly recognizable by both its appearance and its characteristic undulating swimming motion used to advertise its cleaning services.

In the wild, Labroides dimidiatus sets up cleaning stations on prominent reef features where client fish of all sizes, from small gobies to large groupers and even sharks, line up to have parasites removed. The relationship between cleaner wrasse and their clients is one of the most well-studied examples of mutualistic symbiosis in the animal kingdom. Research has demonstrated that reefs with healthy cleaner wrasse populations have significantly lower parasite loads and greater fish diversity than reefs where cleaners have been removed.

The Bluestreak Cleaner Wrasse is classified as an advanced-level species in the aquarium hobby, and its inclusion here comes with an important caveat. This species is an obligate parasite feeder in the wild and has historically had very poor survival rates in captivity due to its specialized dietary needs. Many experienced aquarists and conservation-minded hobbyists advocate against purchasing this species. However, with dedicated care, frequent feedings of enriched frozen foods, and tankmates that provide natural cleaning opportunities, some aquarists have maintained specimens successfully for extended periods. Prospective keepers should carefully consider whether they can meet this species' demanding requirements before acquiring one.