Finger fish
Introduction
The Finger fish, scientifically known as Monodactylus argenteus, is a captivating species cherished by aquarists for its unique disc-shaped body and shimmering silver coloration. Often referred to as the Silver Moony or Malayan Angel, this fish adds a dynamic presence to both freshwater and brackish aquariums. While juveniles can adapt to freshwater environments, adults thrive in brackish or marine conditions, making them a versatile choice for hobbyists willing to accommodate their evolving needs. Their peaceful nature and schooling behavior further enhance their appeal, though they do require spacious tanks and specific water parameters to flourish.
What makes the Finger fish a popular choice among aquarists?
Its striking appearance, adaptability to different water conditions, and peaceful temperament make the Finger fish a favored addition to diverse aquarium setups.
Are Finger fish suitable for beginners?
While they are hardy, their need for transitioning from freshwater to brackish or marine environments as they mature may pose challenges for novice fishkeepers.
Care and Environment
Caring for Finger fish requires attention to their specific environmental and dietary needs to ensure their health and longevity.
What is the minimum tank size for a single Finger fish?
A minimum tank size of 200 liters is recommended to provide adequate space for a single Finger fish.
What are the ideal water parameters for Finger fish?
They prefer temperatures between 22°C and 25°C, a pH range of 7.2 to 8.5, and water hardness between 8 to 15°N (142.86 - 267.86 ppm).
Do Finger fish require brackish water?
Juveniles can survive in freshwater, but as they mature, it's advisable to gradually increase the salinity to mimic their natural transition to brackish or marine environments.
Filtration should be robust to maintain water quality, and moderate lighting is sufficient. Decorate the tank with rocks and driftwood to provide hiding spots, but ensure ample open space for swimming. As omnivores, Finger fish accept quality flake foods supplemented with vegetable matter like spinach, lettuce, or peas. They may also nibble on tender plants, so choose hardy vegetation. Regular monitoring of water parameters and gradual acclimation to changing salinity levels are crucial for their well-being.
Origin and Habitat
Finger fish are native to the coastal regions of Africa, Asia, and Australia. They inhabit estuaries and coastal areas, often transitioning between freshwater and marine environments. Juveniles are commonly found in brackish waters, while adults tend to reside in full marine conditions. These habitats are characterized by varying salinity levels, moderate water flow, and abundant vegetation, providing both shelter and feeding grounds. Understanding their natural habitat is essential for replicating similar conditions in captivity to promote their health and natural behaviors.
Where are Finger fish commonly found in the wild?
They are distributed along the coastlines of Africa, India, southern Asia, and as far west as Australia.
Do Finger fish inhabit freshwater or marine environments?
They are euryhaline, meaning they can live in both freshwater and marine environments, often transitioning from brackish waters as juveniles to marine habitats as adults.
Temperament and Compatibility
Finger fish are peaceful and social, thriving in groups. They are shoaling species, meaning they prefer to be kept in groups of at least 4-6 individuals. This grouping helps reduce stress and encourages natural behaviors. They are best housed with other peaceful, similarly sized fish that can tolerate brackish conditions. Avoid aggressive species or those small enough to be seen as prey. Providing a spacious tank with ample swimming room and hiding spots will help maintain harmony among tank mates.
Are Finger fish aggressive?
No, they are generally peaceful and do well in community tanks with compatible species.
Can Finger fish be kept alone?
It's not recommended; they are shoaling fish and thrive when kept in groups.
Interesting Facts
Finger fish are known for their striking, laterally compressed bodies and tall dorsal and anal fins, giving them a unique, disc-like appearance. They are truly euryhaline, capable of living in both freshwater and marine environments, which is uncommon among aquarium fish. Despite their adaptability, breeding Finger fish in captivity is rare, with no reported cases of successful breeding in home aquariums. Their ability to transition between different salinity levels makes them a fascinating species for aquarists interested in brackish water setups.
Why are they called Finger fish?
Their long, scaly fins resemble fingers, which is how they got their common name.
Can Finger fish breed in captivity?
There have been no reported cases of successful breeding in home aquariums.
Sources
All information in this article has been gathered from the following reputable sources: