Pectoral Fin Spot Ricefish - Oryzias pectoralis Fish Profile & Care Guide
Table of contents
Introduction
Pectoral Fin Spot Ricefish (Oryzias pectoralis) is a small but notable species of freshwater fish that belongs to the Adrianichthyidae family. These Ricefish have garnered attention among aquarists and researchers for their adaptability to diverse aquatic environments and their unique reproductive strategies. This species is distinguished by its petite size, reaching an average length of around 2 to 3 centimetres.
The Pectoral Fin Spot Ricefish, a species recognized for its peaceful and active nature, represents an excellent choice for aquarists seeking to populate nano or planted aquariums. Due to their diminutive size, however, it is advisable to refrain from incorporating them into general community tank setups.
To observe their most natural behaviours and vibrant colouration, it is preferable to maintain these Ricefish in schools comprising six or more individuals. Remarkably, when housed in larger groups, they tend to exhibit minimal interest in other species, rendering them compatible tankmates for fish such as Microdevario, Sundadanio, Trigonostigma, Pygmy Corydoras, small Catfish like Otocinclus, and even Dwarf Shrimp.
For those considering the prospect of breeding Ricefish, the optimal approach involves isolating them. These Ricefish are known for their robustness and adaptability, thriving in well-maintained and pristine aquatic conditions. They manifest their most vibrant hues when housed in well-planted aquariums featuring a dark substrate, particularly when supplemented with the presence of floating plants. In environments offering ample coverage, these Ricefish showcase their inherently outgoing nature to the fullest extent.
Pectoral Fin Spot Ricefish have a sleek body shape with a neat black spot on the upper part of their pectoral fin base. Their body colour is light tan, and you'll also notice some dark spots on their belly area. Their caudal fin has long, almost thread-like rays and is edged in red striping. They sport a thin black line that runs from their head down to the base of their tail fin, continuing onto the tail fin itself, both above and below the midline. You might also spot a faint black line near their anal fin. Look closely, and you'll see tiny dark spots scattered on the membranes between their dorsal and anal fins.
Pectoral Fin Spot Ricefish Photos
Sexual Dimorphism
Pectoral Fin Spot Ricefish display distinct physical differences between males and females, particularly during the breeding season. Male Indian Ricefish typically exhibit more vibrant and striking colouration compared to females. Their fins and body often showcase brighter hues, and they may display intricate patterns or colour markings that serve as visual cues to attract potential mates. Additionally, males may possess elongated dorsal and anal fins, which further distinguish them from their female counterparts.
Conversely, female Indian Ricefish tend to maintain a more subdued and less colourful appearance, with shorter fins that lack the ornate adornments characteristic of males. These visual disparities between the sexes play a pivotal role in courtship and mate selection, with males using their enhanced colouration and fin displays to court females.
Quick Facts
| Scientific Name | Oryzias pectoralis |
|---|---|
| Year Described | 1998 |
| Kingdom | Animalia |
| Classification | Actinopterygii |
| Order | Beloniformes |
| Family | Adrianichthyidae |
| Genus | Oryzias |
| Origins | Laos , Vietnam |
| Max Size | 2.5 cm |
| Temperament | Peaceful |
| Aquarium Level | Middle - Top |
| Difficulty | Beginner - Intermediate |
| Shoaling | Yes |
| Best kept as | Groups 6+ |
| Diet & Feeding | Omnivore |
| Reproduction | Egg Depositor |
| Average Lifespan | Up to 4 Years |
Water Parameters
| Water Type | Freshwater |
|---|---|
| pH | 6.5 - 8.0 |
| GH | 8 - 20 |
| ℉ | 50 - 82 |
|---|---|
| ℃ | 10 - 28 |
Natural Habitat
Pectoral Fin Spot Ricefish are indigenous to the Nam Theun Basin in Laos and the Quang Ninh Province in Vietnam, which are located within the Asian continent. These Ricefish are primarily found inhabiting diverse aquatic environments, including rice paddies, swamps, and sheltered regions of slowly flowing rivers within their endemic range.
Breeding
Breeding Pectoral Fin Spot Ricefish is a relatively straightforward process, and these fish are known for being prolific. Females can produce between 10 to 20 eggs every few days and typically spawn in the early morning hours. When male Ricefish are ready to breed, their body colour darkens, and they begin to defend small territories against other males while attempting to attract females.
The adhesive eggs are discharged as a single mass and fertilized simultaneously by the male. The eggs remain on the female genital pore for a short period before being deposited amongst aquatic plants. Add a few clumps of fine-leaved aquarium plants, such as java moss, to the breeding tank to encourage breeding. Spawning mops can also be used for this purpose.
The eggs typically hatch within one to three weeks, depending on the water temperature. Adult fish tend to ignore the eggs but may consume the babies swimming around. Therefore, it's best to place the eggs in a separate aquarium to ensure the survival of the fry. When introducing juveniles of different ages together, caution needs to be taken, as larger fry can prey on smaller ones if there is a significant size difference.
Once the fry becomes free-swimming, feed them tiny live foods such as microworms and baby brine shrimp. This will provide them with the necessary nutrients and energy to grow and develop properly. Breeding Pectoral Fin Spot Ricefish can be a fascinating and rewarding experience for hobbyists. By providing optimal breeding conditions and care for these fish, you can witness the natural beauty of their life cycle and enjoy their company in your aquarium for many years to come.
Diet & Feeding
In their native habitats, Pectoral Fin Spot Ricefish exhibit an omnivorous feeding strategy. They are opportunistic feeders, consuming a varied diet that primarily consists of aquatic invertebrates, including small crustaceans, insect larvae, and zooplankton. In a controlled aquarium setting, Indian Ricefish are versatile eaters and readily accept a wide range of foods. Their diet typically includes high-quality commercial fish pellets or flakes, freeze-dried or live foods like brine shrimp, daphnia, and bloodworms, as well as finely chopped vegetables and plant matter.
Ensuring a balanced diet is crucial for their health, and feeding them a variety of foods enhances their overall well-being. Due to their relatively small size, it's essential not to overfeed them, as Indian Ricefish can be prone to obesity when given excessive amounts of food. Additionally, Indian Ricefish will sometimes nibble on algae and small microorganisms present in a well-established aquarium with live plants, contributing to the overall ecosystem balance.
