Spiny Pleco

In natural conditions, adult specimens of this species reach about 26 cm in length. The maximum known for the species is about 40 cm, but in an aquarium the fish grows slowly and usually stops at 25–30 cm. The catfish's body is somewhat flattened and adorned with large, fan-shaped fins. The body surface is rigid, covered with roughness and rows of sharp spines, which is reflected in the species' name. It is also worth noting that the first rays of the fins are significantly thickened, forming sharp spines, which are also studded with small prickles. One of the characteristic features of its appearance is the presence of rounded dark spots evenly distributed over the entire body. The coloration also varies, ranging from yellowish to almost black tones, depending on the specific geographical origin. The catfish's mouth, located on the underside of the head, is a sucker. Its few but very strong teeth are perfectly adapted for cracking the shells of river mollusks.

The species is endemic to Brazil and inhabits the Amazon River basin, including the Rio do Pará region. In nature, the fish live in rivers with clear water and slow currents. As natural shelters, they prefer areas with snags and rocky bottoms, where they spend daylight hours, showing activity mainly during the night.

It should be noted that the behavior pattern of these catfish is quite complex. The Spiny Pleco exhibits pronounced territorial instincts. If two adult individuals are not provided with enough space, conflicts and mutual aggression are inevitable. Similar difficulties will arise when cohabiting with other territorial fish species. For comfortable keeping of a single catfish, it is recommended to provide it with a minimum aquarium bottom area of 0.6 m². Provided this requirement is met, hostile manifestations are generally not observed. This catfish is peaceful towards fish of comparable size that inhabit the upper or middle water layers.

For keeping a single adult Ornate Pleco, an aquarium of 250–300 liters will be optimal, provided its bottom area reaches the aforementioned 0.6 square meters (for example, 120×50 cm). It is desirable to include various appropriately sized shelters in the decor — these can be large snags, rock formations, boulders, or artificial caves. The fish show the highest activity under subdued lighting, especially after the main lights are turned off. If light intensity is not critical for other aquarium inhabitants and plants, you can initially set up dim lighting or create shaded areas using floating plants. Acclimated individuals can successfully adapt to a fairly wide range of water parameters, especially pH and dGH. However, slightly acidic or neutral water conditions of medium hardness are considered most comfortable. Long-term and successful keeping largely depends on the aquarist's ability to maintain a stable habitat that meets the needs of this species. Regular aquarium maintenance activities, as well as the uninterrupted operation of all equipment, and especially the filtration system, are crucial for achieving this goal.

In natural conditions, the diet consists mainly of various invertebrates, such as mollusks, worms, aquatic insects, and their larvae. In the absence of familiar food, these catfish can feed on various plants, fallen fruits, and other plant organic matter. Overall, it is an omnivorous species, but its diet is dominated by protein components. In a home aquarium, sinking dry foods with high protein content should be offered, as well as live or frozen foods, such as bloodworms, pieces of mussels, and shrimp. As additional components, vegetable fragments such as cucumber, zucchini, or eggplant can be used.

Breeding in aquarium conditions is difficult and requires the creation of specific conditions. Spawning occurs in prepared enclosed shelters, which the male actively guards. Fry grow slowly and require quality nutrition and stable water parameters for successful development. Due to the territorial behavior of the parents, the breeding tank must provide a sufficient number of hiding places.

This species is characterized by high sensitivity to water quality, particularly to the accumulation of nitrogenous compounds. If keeping conditions are violated, bacterial infections of the skin and fins are possible. Prevention includes regular water changes, powerful filtration, and maintaining substrate cleanliness. Due to the presence of sharp spines on the fish's body, caution should be exercised during transportation and transfer to avoid injury.

When purchasing, choose active individuals with clean fins and no visible body damage. It is important to ensure there is no sunken belly, which may indicate emaciation or internal parasitic diseases. In the store, the fish often behave secretively, so it is worth asking the seller to gently lift decorations to inspect the catfish. The territorial nature of the species should be considered, and multiple individuals should not be acquired for keeping in a limited volume.