<\/p>\n
That dark black body, the heavy stillness at the bottom of the tank, and then that bright red tail that looks like it was painted on. When you see a redtail catfish for the first time, these are the three things that stay with you. Then the questions start coming: what are those whiskers for, why does it have that color contrast, is it actually dangerous? This fish was made to spark curiosity.<\/p>\n<\/p>\n
One of the largest freshwater fish in the world, this species stands in a league of its own, not just because of its size but because of its character. Calm during the day, a silent hunter at night. Despite being aware of every corner of the tank through its extraordinary sense of smell, it gives nothing away. Everything you need to know about the redtail catfish is right here on this page.<\/p>\n<\/p>\n
The redtail catfish, known scientifically as Phractocephalus hemioliopterus<\/em>, is a large freshwater species belonging to the family Pimelodidae. Its defining feature is right there in its name: while most of its body is deep black or dark charcoal, its tail fin and adipose fin are a vivid orange-red. This color contrast sets it apart from all other freshwater species of similar size at a glance. Its head is disproportionately wide and flat, and its mouth is enormous relative to its body. This anatomy directly shapes both its feeding habits and its way of life.<\/p>\n<\/p>\n Native to the Amazon and Orinoco river basins of South America, this species lives naturally in the wide, deep rivers of Venezuela, Brazil, Peru, Ecuador and Colombia. Over millions of years it has adapted entirely to bottom-dwelling life; its body has grown flatter, its head wider, its mouth larger. None of this is coincidence. It is the result of an evolutionary design refined over an immense stretch of time.<\/p>\n<\/p>\n Around its mouth sit multiple barbels, the long whisker-like organs. These are not decorative. They are fully functioning sensory organs used to detect water currents, chemical signals and the movements of prey. Its eyes are relatively small and dark; its vision is not particularly strong, but its sense of smell more than makes up for that.<\/p>\n<\/p>\n There is only one species of redtail catfish; there are no color variants or selectively bred varieties. Even so, it is sometimes confused with other species in the aquarium trade.<\/p>\n<\/p>\n The tiger shovelnose catfish, known scientifically as Pseudoplatystoma fasciatum<\/em>, is sometimes confused with the redtail catfish due to its tiger-like markings and elongated body. The difference is clear once you look closely: the tiger shovelnose is far more slender and there is no red pigment in its tail. Both species share the same river basins, but when placed side by side the resemblance turns out to be less than expected.<\/p>\n Hybrids produced by crossing the redtail catfish and the tiger shovelnose appear frequently at aquarium retailers. These fish carry the traits of both parents, showing tiger-like markings alongside a red tail. Hybrids are sterile and cannot reproduce. Some sellers offer them as purebred specimens, so it is worth being careful when purchasing.<\/p>\n The size figures can be hard to believe at first glance. In its natural habitat, the redtail catfish reaches lengths of 100 to 130 centimetres. The largest specimens on record have been measured between 150 and 180 centimetres, with weights reaching up to 80 kilograms. In controlled aquarium environments these figures tend to be somewhat lower, with individuals growing to between 80 and 120 centimetres being common.<\/p>\n<\/p>\n Growth in the first few years is remarkably fast. A young individual can grow 15 to 20 centimetres per year. This is why fish acquired at a young age are often seen outgrowing their tanks in a short space of time. Long-term planning before acquisition is essential. In short: it starts big and ends bigger.<\/p>\n<\/p>\n The main factors that influence growth rate are feeding quality, water temperature and cleanliness, and the size of the tank. Individuals kept in spacious environments with good nutrition grow significantly faster than those in more restricted conditions.<\/p>\n<\/p>\n Its homeland is the Amazon, one of the most species-rich river systems on Earth. In the wild it favours slow, deep rivers, broad floodplains and waterways winding through tropical forest. Calm, shaded areas with muddy or rocky bottoms are where this fish is most at home.<\/p>\n<\/p>\n It rarely rises to the water’s surface. Most of the day is spent at the bottom; then at night everything changes. It becomes active, sweeping the tank with its sense of smell and hunting silently. This rhythm was shaped over millions of years and shows no sign of changing.<\/p>\n<\/p>\n It prefers water temperatures between 23 and 28 degrees Celsius. Outside this range, feeding decreases and the immune system weakens. During the rainy season, when rivers flood and spill across vast areas, the fish has been observed travelling unusually large distances. During this period feeding activity increases noticeably, as the floodwaters carry fruit, insects and small animals into the forest, creating additional food sources.<\/p>\n While a hardy species, its large size and high metabolism mean it carries specific requirements. Uninformed care can lead to serious problems in a short time.<\/p>\n<\/p>\n The most critical factor in its care is tank size. While 500 to 700 litres may seem adequate for a juvenile, this quickly becomes insufficient as the fish grows. For a fully grown individual, a tank with a capacity of at least 2,000 to 3,000 litres should be considered. These figures are rarely achievable in a home setting, which is why the redtail catfish is a species suited to professional aquariums and serious collectors.<\/p>\n The length of the tank should be at least twice the length of the fish to allow it to turn comfortably. Length and width take priority over height; since this is a bottom-dwelling species, a large horizontal surface area is essential.<\/p>\n<\/p>\n The ideal water temperature is between 23 and 28 degrees Celsius. Sudden temperature changes weaken the immune system and cause stress. A water pH of 6.0 to 7.5 is ideal; hardness should be kept at a moderate level. Ammonia and nitrite should both read zero, and nitrate levels should not be allowed to climb too high. Since this species produces a high biological load, regular testing of water parameters is essential.<\/p>\n<\/p>\n This is a species that eats a great deal and produces a great deal of waste. Filtration capacity of several times the tank volume is required. Biological, mechanical and chemical filtration must all work together; a single filter is never sufficient. Multiple high-capacity filters should be run in parallel.<\/p>\n<\/p>\n A weekly water change of 30 to 40 percent is mandatory. Some experienced aquarists prefer to do two changes of 25 percent per week. The temperature of the water being added should match the temperature of the tank; a sudden difference causes stress.<\/p>\n<\/p>\n Large, heavy rocks, hardwood roots and wide structures that serve as hiding places support the natural behaviour of this species. Small and light decorative objects tend to get displaced or damaged by the fish’s movements. Sharp-edged objects should be avoided entirely; the barbels and underside of the body are easily injured on such surfaces.<\/p>\n Live plants do not fare well alongside this species. Large body movements uproot them or damage their roots. Artificial plants are a far more practical solution.<\/p>\n<\/p>\n There are no special lighting requirements. Moderate lighting that mimics a natural day cycle is sufficient. A light period of 10 to 12 hours followed by darkness is ideal. Very bright or continuous lighting can cause stress in this species.<\/p>\n<\/p>\n This is a true carnivore. Its wide mouth and powerful jaw structure make it an exceptionally effective hunter. In the wild, small to medium-sized fish, crustaceans, insects that fall onto the water surface and fruit are its main food sources. Its vision is not particularly sharp, but its sense of smell more than compensates; it can detect chemical signals in the water from very long distances. This is why a restlessness begins in the tank before feeding time: the fish has already picked up the scent.<\/p>\n High-quality sinking pellets formulated for large catfish should form the basis of its diet. Floating foods are not suitable for this species; as a bottom feeder, the redtail catfish does not rise to the surface to feed. The pellets should be rich in protein, vitamins and minerals.<\/p>\n<\/p>\n Frozen shrimp, squid, mussel meat, crab meat and white fish fillet pieces add valuable variety to its diet. Live food can also be given, though live feeder fish carry a parasite risk and are best avoided. Earthworms and insect larvae are a much safer alternative.<\/p>\n<\/p>\n Young individuals in the growth phase can be fed three to four times per week; adults twice per week is sufficient. Overfeeding leads to obesity and rapid deterioration of water quality. Uneaten food should be removed from the tank immediately, as waste left in the water raises ammonia to dangerous levels.<\/p>\n<\/p>\n It is also worth noting that this fish can prey on smaller tankmates even when full. This is entirely instinctive behaviour and has no direct connection to how much it has been fed.<\/p>\n<\/p>\n This species usually spends its daylight hours at the bottom of the tank. This is a completely normal resting pattern for it. At night it sweeps the tank using its sense of smell and feeds opportunistically. This day and night rhythm is an inseparable part of its nature.<\/p>\n<\/p>\n It is not a territorial species and can generally coexist with its own kind. When kept with smaller fish, however, the situation changes. Any creature smaller than itself can eventually become prey. This is not aggression; it is pure hunting instinct.<\/p>\n<\/p>\n Individuals that are fed regularly begin to recognise their keepers over time. It may rise to the surface when someone approaches the tank and learns when feeding time is. This behaviour, far more pronounced in some other large freshwater species, can also be observed in the redtail catfish.<\/p>\n Plenty of people wonder about this, especially when seeing such a large fish for the first time.<\/p>\n The red tail catfish is not an aggressive species by nature. There are no records of it showing aggression toward humans. In its natural habitat it is a shy creature that tends to avoid contact with people.<\/p>\n<\/p>\n There is, however, a genuine risk that should not be ignored: the sharp spines at the base of its pectoral fins. These spines can cause serious injuries when the fish is under stress or makes sudden movements. Thick gloves are essential whenever the fish needs to be handled by hand. Another point to be aware of is its jumping behaviour. When frightened or stressed it can make powerful, high-energy leaps. For this reason the tank must always be kept covered with a heavy lid or secure cover.<\/p>\n Choosing tankmates for this species is perhaps the most critical consideration. The basic rule is simple: choose species of the same size or larger.<\/p>\n<\/p>\n Pacu, large arowana, large oscar and other South American catfish of comparable size have the capacity in terms of both size and temperament to share a tank with the redtail catfish. Large armoured catfish, being bottom-dwellers themselves, also tend not to cause problems when they are large enough.<\/p>\n<\/p>\n All small to medium-sized fish struggle to survive long in this tank. Species such as guppies, angelfish, neon tetras, mollies and platys must never be kept with the redtail catfish. Small turtles and crustaceans are also at risk.<\/p>\n<\/p>\n It can be kept with its own kind, but sufficient space is essential. Overcrowded and confined conditions lead to stress, and stress creates the conditions for unexpected aggressive behaviour.<\/p>\n Given the right conditions, it comfortably surpasses 15 years in an aquarium setting. Some individuals have been documented living close to 20 years. This lifespan makes the redtail catfish a serious long-term commitment that should be thought through carefully before acquisition. A juvenile taken in will potentially be with you for decades. The main factors that directly affect lifespan are water quality, feeding routine, minimising stress and providing adequate space.<\/p>\n<\/p>\n While generally a hardy species, certain health problems can arise under poor care conditions.<\/p>\n One of the most commonly seen issues. It usually stems from deteriorating water quality, stress or incorrect water temperature. Water parameters should be checked, sources of stress identified and, if necessary, the feeding programme reassessed.<\/p>\n<\/p>\n Gradual shortening or fraying of the barbels is an important sign that water quality is declining. High ammonia and nitrate levels trigger this condition. Regular water changes and the use of smooth-edged decorations are the most effective preventive measures.<\/p>\n<\/p>\n White specks resembling grains of salt appear on the body and fins. Stress and sudden temperature changes are the triggering factors. Gradually raising the water temperature combined with appropriate salt treatment generally produces good results. Catfish are known to be sensitive to certain medications, so care should be taken when considering any pharmaceutical treatment.<\/p>\n<\/p>\n Bacterial infection causes the edges of the fins to fray and can lead to progressive deterioration. Poor water quality is the primary cause. Early intervention through water changes and, where necessary, antibacterial treatment should be applied.<\/p>\n<\/p>\n Swelling of the abdomen can result from overfeeding, constipation or internal parasites. Reduce feeding amounts and seek veterinary advice in serious cases.<\/p>\n<\/p>\n Broken or damaged fin spines during handling or transport are a common occurrence. Broken spines heal over time; keeping water quality high during the recovery period prevents infection.<\/p>\n<\/p>\n Breeding the red tail catfish in an aquarium setting is extremely difficult and success requires considerable expertise. In the wild, spawning is triggered by the water level changes that occur during the Amazon’s rainy season. Replicating this seasonal cycle in a controlled environment is a highly complex process.<\/p>\n Distinguishing males from females visually is difficult. Adult females tend to have a broader and more rounded belly than males, but this difference is hard to determine with certainty from the outside. Commercial breeding is generally carried out at large fish farms using hormonal methods.<\/p>\n<\/p>\n The redtail catfish is not currently listed in a threatened category on the International Union for Conservation of Nature’s red list. But this is not a permanent guarantee.<\/p>\n<\/p>\n Deforestation across the Amazon basin, river pollution and overfishing are steadily shrinking the natural habitat of this species. Fishing for food is particularly widespread in the region; the redtail catfish is an important food source for communities living along the Amazon. It is also heavily collected for the aquarium trade. The long-term protection of the Amazon ecosystem is critically important for the future of this species.<\/p>\n<\/p>\n The red tail catfish is among the most impressive species found in professional aquariums, owing to its exceptional size and specialised needs. Those who want to explore the fascinating world of freshwater creatures at Emaar Aquarium will find plenty of different species to observe up close.<\/p>\n<\/p>\n Visit Emaar Aquarium to discover giant freshwater species from South America such as pacu<\/a>, arowana<\/a> and banded leporinus<\/a>, as well as marine species including sharks<\/a>, rays<\/a> and octopus<\/a>. Don’t forget to check our feeding schedule<\/a>.<\/p>\n<\/p>\n In an aquarium it typically reaches 80 to 120 centimetres; in the wild, between 100 and 180 centimetres. Young individuals can grow 15 to 20 centimetres per year.<\/p>\n<\/p>\n It is a carnivore. Large sinking pellets, frozen shrimp, squid, fish fillet and earthworms are among its preferred foods.<\/p>\n<\/p>\n Under the right conditions it lives between 15 and 20 years. Some individuals live even longer.<\/p>\n<\/p>\n There are no recorded instances of aggression toward humans. However, the sharp spines on its fins can cause serious injuries when the fish is handled.<\/p>\n It can only be kept alongside species of the same size or larger. Smaller fish will eventually become prey.<\/p>\n<\/p>\n As a species that breathes through gills, it can only survive out of water for a few minutes.<\/p>\n<\/p>\n Breeding in a controlled environment is extremely difficult. The process requires hormonal intervention and specialist knowledge, and success is rare.<\/p>\n A fully grown individual requires a tank of at least 2,000 to 3,000 litres. This makes it a species suited to professional setups or large-scale collections.<\/p>\n It is not aggressive toward large fish or humans. However, any creature smaller than itself is considered potential prey. This is entirely instinctive behaviour.<\/p>\n <\/p>\n","protected":false},"excerpt":{"rendered":" Red Tail Catfish Size, Care, Diet and Lifespan<\/p>\n","protected":false},"author":2,"featured_media":29796,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"cybocfi_hide_featured_image":"","footnotes":""},"categories":[384,443],"tags":[],"class_list":["post-29797","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-creatures","category-underwater-world-creatures"],"yoast_head":"\nSpecies That Are Often Confused with the Redtail Catfish<\/h2>\n<\/p>\n
Tiger Shovelnose Catfish<\/p>\n<\/h3>\n
Hybrid Individuals<\/h3>\n<\/p>\n
How Large Does It Grow?<\/p>\n<\/h2>\n
Where Does It Live?<\/h2>\n<\/p>\n
Red Tail Catfish Care<\/h2>\n<\/p>\n
Tank Size<\/h3>\n<\/p>\n
Water Parameters<\/h3>\n<\/p>\n
Filtration and Water Changes<\/h3>\n<\/p>\n
Tank Decoration<\/h3>\n<\/p>\n
Lighting<\/h3>\n<\/p>\n
What Does It Eat?<\/h2>\n<\/p>\n
Main Foods<\/h3>\n<\/p>\n
Fresh and Frozen Foods<\/h3>\n<\/p>\n
How Often Should It Be Fed?<\/p>\n<\/h3>\n
Behaviour<\/h2>\n<\/p>\n
Does It Attack Humans?<\/h2>\n<\/p>\n
Which Fish Can It Live with?<\/h2>\n<\/p>\n
Compatible Species<\/h3>\n<\/p>\n
Incompatible Species<\/h3>\n<\/p>\n
With Its Own Kind<\/h3>\n<\/p>\n
How Long Does It Live?<\/h2>\n<\/p>\n
Diseases<\/p>\n<\/h2>\n
Loss of Appetite and Feeding Refusal<\/h3>\n<\/p>\n
Barbel Erosion<\/p>\n<\/h3>\n
White Spot Disease<\/h3>\n<\/p>\n
Fin Rot<\/h3>\n<\/p>\n
Bloating<\/h3>\n<\/p>\n
Spine Injuries<\/h3>\n<\/p>\n
Reproduction<\/h2>\n<\/p>\n
Conservation Status and Threats<\/h2>\n<\/p>\n
Discover the Freshwater World at Emaar Aquarium<\/h2>\n<\/p>\n
Frequently Asked Questions<\/h2>\n<\/p>\n
How large does the red tail catfish grow?<\/h3>\n<\/p>\n
What does the red tail catfish eat?<\/h3>\n<\/p>\n
How long does it live?<\/h3>\n<\/p>\n
Does it attack humans?<\/h3>\n<\/p>\n
Which fish can it live with?<\/h3>\n<\/p>\n
How long can the redtail catfish survive out of water?<\/h3>\n<\/p>\n
Does it breed in an aquarium?<\/h3>\n<\/p>\n
What tank size does it need?<\/h3>\n<\/p>\n
Is the red tail catfish aggressive?<\/h3>\n<\/p>\n