Boeseman's rainbowfish
A colourful, peaceful rainbowfish endemic to West Papua.
Boeseman's rainbowfish (Melanotaenia boesemani) belongs to the family Melanotaeniidae. This fish is found only in the Ayamaru Lakes and their connected streams, located in the mountainous region of the Bird's Head Peninsula in West Papua, Indonesia. Its scientific name honors Dutch ichthyologist Marinus Boeseman, who collected the first specimens.
In home aquariums, the species is valued for its striking colors and calm temperament. Unlike most other rainbowfish, its body is split into two distinct halves: a bluish-grey or purple front and an orange-red rear, with some individuals showing a nearly perfect line between the two. With proper food and water conditions, they often grow longer than 10 cm (3.9 inches). Like other rainbowfish, they can change the intensity of their colors, which may reflect mood or health, and colors are usually more vivid at night. They do best in groups with at least as many females as males, due to their friendly, community nature, and get along well with many other fish, including tetras, barbs, gouramis, danios, discus, guppies, swordtails, loaches, and corydoras. Snails are also good tank mates. However, smaller freshwater shrimp from the genera *Caridina* and *Neocaridina* may be eaten, while ghost, vampire, amano, and bamboo shrimp are safe. It is best to add adult shrimp first, then baby rainbowfish, and to provide hiding spots for shrimp alongside open swimming areas for the fish. Though generally hardy, they are prone to columnaris disease.
As omnivores, they are not fussy eaters and will accept most foods, though they prefer meatier options. For best health, offer a mix of dry, frozen, and live foods, such as krill flakes, dry pellets, frozen bloodworms, daphnia, and brine shrimp. Because their mouths are small relative to their bodies, food should be appropriately sized. Depending on water temperature, they typically live 5 to 8 years, though some hobbyists have reported lifespans of 13 to 15 years.
Quick Facts
- Taxon
- Melanotaenia boesemani
Facts from the source article.
Lore & Background
The specific name boesemani honors Dutch ichthyologist Marinus Boeseman, who collected the type specimens. The species is endemic to the Ayamaru Lakes and their tributaries in the mountainous Bird's Head Peninsula of West Papua, Indonesia. Its colour pattern is distinctive among rainbowfish, with a half orange-red rear and a bluish-grey or purple front, sometimes almost perfectly defined. Like most rainbowfish, it can adjust its color intensity, which may indicate mood or health; generally, intensity is greater at night. In captivity, it is a relatively hardy fish that prefers weakly alkaline pH conditions and is prone to columnaris. It is best kept in groups with as many or more females than males, and can coexist with many other species, though smaller freshwater shrimp in the genera Caridina and Neocaridina may be viewed as prey.
Reader's Guide
Boeseman's rainbowfish is notable in the aquarium hobby for its excellent colours and peaceful demeanor, making it a popular community fish. The article describes it as a relatively hardy species that can grow to lengths exceeding 10 cm (3.9 in) under proper care. Its diet is omnivorous, with a preference for meatier foods, and a variety of dry, frozen, and live foods is recommended for optimal health. The species is prone to columnaris, a bacterial disease. Its lifespan averages 5–8 years, though some hobbyists have reported keeping them alive for up to 13–15 years. The fish is best kept in groups with a balanced sex ratio and can be housed with many tank mates, including other rainbowfish, barbs, tetras, corydoras, snails, gouramis, danios, discus, guppies, swordtails, and loaches. Care must be taken with smaller shrimp species, which may be eaten, while larger shrimp such as ghost, vampire, amano, and bamboo shrimp are compatible. The article emphasizes providing hiding places for shrimp and open spaces for the rainbowfish.
Did You Know?
- The species is named after Dutch ichthyologist Marinus Boeseman, who collected the type specimens.
- It can live up to 13–15 years, though the average lifespan is 5–8 years.
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