Red Hook Silver Dollar - Myloplus rubripinnis Fish Profile & Care Guide
Introduction
The Red Hook Silver Dollar (Myloplus rubripinnis) is a remarkable species of tropical freshwater fish renowned for its distinctive appearance and captivating behaviour. These elegant creatures exhibit striking silver scales with a vivid red anal fin with black edging, a characteristic that lends them their distinctive name. Some specimens may have orange spotting. Red Hook Silver Dollars are prized by aquarists for their mesmerizing schooling behaviour and tranquil disposition, making them an excellent choice for community aquariums.
For the optimal care and social well-being of Red Hook Silver Dollars, it is imperative to maintain them in congenial company, preferably in groups of no fewer than six individuals. Larger assemblies are recommended to foster a heightened sense of security among the fish. To ensure a harmonious cohabitation environment, it is strongly advised not to house Red Hook Silver Dollars with smaller or aggressive species, as this may lead to potential conflicts and disrupt their tranquil habitat.
Red Hook Silver Dollars predominantly inhabit the upper and middle regions of the aquarium, making it prudent to choose complementary tankmates that primarily occupy the lower portion of the tank to establish a balanced ecosystem. Larger, non-aggressive catfish species such as plecos and doradids represent a judicious selection for fostering harmony within the aquarium environment.
In order to ensure their optimal care and well-being, it is essential to provide Red Hook Silver Dolars with a spacious, well-maintained aquatic environment featuring adequate hiding places. The aquarium housing Red Hook Silver Dollars should ideally be situated in a tranquil environment, minimizing exposure to frequent pedestrian traffic.
These fish exhibit a skittish temperament, rendering them easily startled. Consequently, it is imperative to provide them with ample secluded areas within the aquarium, coupled with a secure, snug-fitting lid to prevent inadvertent leaps. Prudent consideration should be given to the selection of decor, ensuring the absence of sharp elements that might potentially harm the fish during their retreats.
When undertaking aquarium maintenance, the utmost caution should be exercised to avoid distressing these sensitive specimens. Redhook Myleus are predominantly herbivorous and possess robust dentition. While they tend to consume most plant species in their habitat, hardier varieties such as Java Fern or Anubias may occasionally thrive. Alternatively, the use of plastic or silk plants may be considered.
Efficient filtration with moderate water circulation, accompanied by tranquil resting zones away from strong currents, is recommended. Adequate oxygenation is crucial, and vigilant maintenance of water quality is imperative, given the fish's susceptibility to elevated nitrate levels. To accommodate their preference for subdued lighting, it is advisable to maintain low-intensity illumination within the aquarium.
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Photos
Sexual Dimorphism
Sexual dimorphism within the Red Hook Silver Dollars remains indistinct, although there may be a subtle differentiation observed in the form of potentially longer anal fins among males.
Quick Facts
| Scientific Name | Myloplus rubripinnis |
|---|---|
| Year Described | 1844 |
| Other Names | Redhook Myleus |
| Kingdom | Animalia |
| Classification | Actinopterygii |
| Order | Characiformes |
| Family | Serrasalmidae |
| Genus | Myloplus |
| Origins | Ecuador Venezuela Colombia Guyana Suriname French Guiana Peru Brazil |
| Approx Max Size | 40 cm |
| Temperament | Peaceful |
| Aquarium Level | Middle - Top |
| Difficulty | Intermediate |
| Shoaling | Yes |
| Best kept as | Groups 6+ |
| Diet & Feeding | Omnivore |
| Reproduction | Egg-Scatterer |
| Average Lifespan | Up to 10 Years |
Water Parameters
| Water Type | Freshwater |
|---|---|
| pH | 6.0 - 7.0 |
| GH | 5 - 15 |
| ℉ | 73 - 81 |
|---|---|
| ℃ | 23 - 27 |
Natural Habitat
Red Hook Silver Dollars are endemic to several South American nations, including Ecuador, Venezuela, Colombia, Guyana, Suriname, French Guiana, Peru, and Brazil. They inhabit the river systems of South America, particularly the Amazon and Orinoco Basins, as well as the rivers within the Guiana Shield region. Notably, these distinctive fish are often observed congregating in significant shoals within the serene stretches of these rivers, with a predilection for areas rich in marginal and overhanging riparian vegetation.
Breeding
Successful breeding of Red Hook Silver Dollars has remained elusive within the aquarium hobby. Notably, the species exhibits a unique reproductive behaviour in which the distinctive red-hooked anal fin of the female serves a functional purpose as a plough. In contrast, the male possesses a bilobed anal fin, specially adapted to envelop the female's "hook" during the spawning process.
When spawning, the female employs her hook to penetrate the substrate, creating a furrow while simultaneously depositing eggs, with the male positioned adjacent to her, ensuring the fertilization of these eggs through the use of his bilobed fin wrapped around the female's hook. Remarkably, the female's hook exhibits remarkable resilience, capable of penetrating coarse gravel with a synchronized body motion, while the male's bilobed fin conforms to this pressure, allowing them to collaborate seamlessly in their reproductive efforts.
Diet & Feeding
The dietary preferences of Red Hook Silver Dollars predominantly revolve around the consumption of submerged or marginal vegetation, encompassing terrestrial plant matter as well. It is advisable to incorporate a substantial quantity of vegetable content into their diet, including but not limited to items such as courgette, cucumber, peas, spring greens, and various green vegetables. Additionally, commercially available foods such as algae wafers, spirulina, and vegetable flake preparations are highly recommended to supplement their nutritional intake. Furthermore, these fish exhibit versatility in accepting a wide array of aquarium foods, relishing occasional treats such as bloodworms and brine shrimp.
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Published: 10 Oct 2023
Last Updated: 10 Oct 2023