Pomacentrus simsiang – Blueback Damsel
Pomacentrus simsiang was first scientifically described by Bleeker in 1856. Its common name is Blueback Damsel. Pomacentrus simsiang belongs to the family Pomacentridae, the Damselfish.
The genus name Pomacentrus is derived from the Greek words ‘poma’ (lid) and ‘kentron’ (spine), referring to the serrations and spines along the edges of the opercular bones. The species name simsiang is derived from the local name for the fish in Jakarta, Indonesia.
Synonyms: Pomacentrus tropicus Seale, Pomacentrus hebardi.
Description
The Blueback Damsel is a small but strikingly colored reef fish. Adult specimens typically reach a length of about 8 to 10 centimeters, with females usually remaining slightly smaller. The most distinctive feature of this species is its intense blue back, which contrasts sharply with its yellow flanks. This striking coloration not only serves for recognition within the species, but also plays a role in communication within groups and in territorial behavior.
The body of the Blueback Damsel is flattened laterally and has the typical silhouette of a damselfish, with a slightly raised dorsal fin. The pectoral and pelvic fins are often slightly transparent and may have a subtle yellowish tint. This tint is barely visible in calm situations, but can become more intense during stress or territorial fights. Juveniles often display less pronounced coloring, which becomes more intense with age and develops the characteristic blue tones fully.
In terms of temperament, the Blueback Damselfish is active, curious, and somewhat territorial. In nature, they often live in small groups or solitarily within clearly defined territories that offer both protection and food. In aquariums, they behave in a lively and interactive manner, exploring their environment and reacting to neighboring fish. Although they are generally not aggressive, they may engage in dominance fights in stressful situations or when there is a lack of hiding places.
The swimming zone of this fish is mainly the reef and coral reefs, where they move between the structures. Life expectancy in the wild has not been specifically documented, but in an aquarium they can live up to 6-8 years under optimal conditions.
Biotope
Pomacentrus simsiang is widespread in the Indo-West Pacific region. Its natural range includes Indonesia (specifically the Mentawai Islands), the Philippines, Palau, Papua New Guinea, the Solomon Islands, and Vanuatu. This species is mainly found in tropical waters, where it inhabits coral reefs and coastal areas with a rich structure.
These fish prefer areas that offer sufficient shelter, such as crevices in rocks, coral formations, and dense vegetation. They typically live in shallow to moderately deep reef zones where the water temperature is consistently warm and the water quality remains stable. The presence of live rock and coral structures is essential for their survival, as these provide shelter from predators and a source of food.
Diet
The Blueback Damsel is omnivorous, which means that its diet includes both plant and animal matter. In their natural habitat, they feed mainly on algae, small invertebrates that live on the reef, and plankton that moves with the current. They are opportunistic eaters and make use of the food sources available in their immediate environment.
In an aquarium, the Blueback Damselfish can be fed a varied diet to support their health and vibrant colors. A good basis consists of high-quality flake food and specially formulated pellets for reef fish. In addition, it is advisable to regularly offer live food such as artemia nauplii or mysis shrimp. Finely chopped muscle tissue from shellfish can also be a valuable addition. It is advisable to feed several small portions per day, which mimics natural foraging behavior and aids digestion.
Common mistakes when feeding reef fish, including the Blueback Damsel, include offering too large portions at once, which can lead to water pollution, or an unbalanced diet that does not provide all the necessary nutrients. A lack of variety can lead to color loss and a weakened immune system. Make sure the food does not sink to the bottom too quickly before the fish can reach it, especially if there are other bottom dwellers that also benefit from the food.
The Aquarium
Pomacentrus simsiang is ideal for aquariums in a well-structured marine aquarium. A minimum aquarium size of 300 liters is recommended to provide sufficient swimming space and hiding places. The design of the aquarium is crucial for the well-being of this fish. Live rocks, coral structures, or artificial reef elements are essential, as they not only serve as hiding places but also stimulate the natural behavior of the fish. Provide sufficient openings and crevices where the fish can retreat and mark its territory.
The ideal water values for the Blueback Damsel are:
- Temperature: 24°C tot 28°C
- pH: 8.0 tot 8.4
- Waterhardness (KH): 8 tot 12 dKH
As far as tank mates are concerned, the Blueback Damselfish is generally peaceful towards other species, provided the aquarium is large enough and there are sufficient hiding places. Suitable tank mates include other peaceful reef dwellers such as Anemonefish, Surgeonfish, and smaller Cardinalfish. However, it is important to note that they can be territorial towards conspecifics or other damselfish, especially in smaller aquariums. Combining multiple Blueback Damselfish can lead to conflicts unless the aquarium is very large and offers many separate territories. Highly dominant species can also cause problems.
Breeding Aquarium and Conditioning
The Blueback Damsel is a species that can be successfully bred in captivity, although this requires more effort than keeping adult fish in a community aquarium. Setting up a special breeding aquarium is recommended to increase the chances of success and protect the young.
A breeding aquarium for Pomacentrus simsiang does not need to be extremely large, but a minimum capacity of 100-150 liters is recommended to provide sufficient space for the parent fish and future offspring. The setup should consist of a substrate of fine sand and various hiding places, such as small rocks or ceramic tubes, where the fish feel safe and can mark their territory. It is important to ensure good water circulation and filtration, but the flow should not be too strong, especially near the breeding area.
Conditioning the parent fish is a crucial step for successful breeding. This involves feeding the fish a high-quality diet rich in protein and vitamins. Live food such as brine shrimp, mysis shrimp, and finely chopped fish meat are excellent for stimulating the reproductive cycle.
The Spawn
The reproductive process begins when the male has chosen a suitable spawning site, usually a smooth surface such as a flat rock, the inside of a shell, or a piece of coral. He thoroughly cleans this site by removing algae and sand. During courtship, his behavior changes visibly; his blue color often becomes more intense and he makes rapid, jerky swimming movements (“signal swimming”) to lure the female to his nest.
As soon as the female is ready to mate, she follows him to the cleaned area. She lays her eggs in a dense, single layer by slowly sliding her abdomen over the surface. The male follows her immediately to fertilize the eggs. A single clutch usually consists of 100 to 500 small, oval eggs, depending on the size and condition of the female.
Immediately after spawning, the dynamics between the fish change completely. The male immediately becomes territorial and aggressive, even towards the female. His task now is to protect the nest. Because the female is seen as a threat or intruder near the nest, he will chase her away fiercely. In a large community aquarium, she can flee, but in a breeding aquarium, it is necessary to remove the female immediately after spawning. This prevents serious stress and injury to the female.
Further brood care is exclusively the male’s responsibility. He remains constantly at the nest and fans fresh, oxygen-rich water over the eggs with his pectoral fins (ventilation). He also keeps the clutch clean by removing unfertilized or moldy eggs so that the healthy eggs are not affected. He will continue this care until the larvae hatch.
Raising the Young Fish
The eggs usually hatch after 3 to 5 days, depending on the water temperature. This almost always happens shortly after the lights go out, in the first hours of darkness. This is a crucial moment, because as soon as the larvae start swimming freely, the father’s care stops immediately. In fact, the father does not recognize the larvae as his young, but sees them as plankton (food). He will not protect them and is likely to eat them if they stay with him.
In order for the fry to survive, it is necessary to separate them from the father and other fish. There are two commonly used methods:
- Moving the nest: If the eggs have been laid on a loose stone or tile, you can carefully transfer them to a breeding tank with the same water just before the eggs hatch (for example, on the evening of the third or fourth day). In the breeding tank, an air stone should provide a slight water movement around the eggs, replacing the father’s fanning.
- Transferre larvae: If the nest cannot be moved, you must wait until the larvae hatch in the father’s tank. Turn off the flow pumps and use a small light in the corner of the tank in the dark. The larvae will be attracted to the light (phototactic behavior) and can be carefully sucked up or scooped out and transferred to the breeding tank.
The newly hatched larvae are tiny, transparent splinters that float in the water column. They have a yolk sac, but this is often used up within 24 hours. It is therefore vital that food is available immediately. Because their mouths are extremely small, newly hatched artemia nauplii are often still too large. During the first few days, they must be fed rotifers (radar animals, such as Brachionus). Adding phytoplankton (green water) to the breeding tank helps to keep the rotifers nutritious and provides contrast, allowing the larvae to see their prey better.
After approximately 7 to 10 days, when the larvae have grown visibly, you can switch to newly hatched artemia nauplii. Later on, you can feed them fine dust food and cyclops. The water quality in the breeding tank must remain excellent, but water changes must be done very carefully (for example, with a drip system) to prevent shocks in temperature or water values.
Conclusion
The Blueback Damsel (Pomacentrus simsiang) is a lively and colorful reef fish that can be successfully kept in a marine aquarium. With a minimum aquarium size of 300 liters and a setup that offers plenty of hiding places, aquarists can enjoy the active and sometimes territorial behavior of this species. The fish is omnivorous and accepts a varied diet, which makes care relatively easy, provided that the water values remain stable between 24-28°C and a pH of 8.0-8.4. Although they are generally peaceful towards other species, they can exhibit dominant behavior towards conspecifics, which should be taken into account when composing the aquarium.
Breeding the Blueback Damsel is challenging but possible, with the male’s care of the eggs and the need to separate the larvae immediately after hatching being crucial to success. The Blueback Damselfish is a robust fish that, with proper care, can reach a life expectancy of 6 to 8 years. Its striking appearance and lively character make Pomacentrus simsiang an attractive choice for both novice and experienced aquarists who want to bring a piece of the tropical reef into their home.
Author
Since I bought my first second-hand aquarium when I was twelve, I have always had one or more aquariums. I even converted a garage into a breeding room where I had 50 aquariums containing around 10,000 liters of water. At the moment, I have two aquariums: a 1,250-liter Tanganyika aquarium and a 250-liter community aquarium with plants. For the past 10 years, I have been working on this website as a writer and photographer.
Copyright images
