Arowana — Food & Nutrition Products

Arowanas are obligate predators with a metabolism built for protein-rich, whole-prey meals. In the wild they feed on insects, smaller fish, crustaceans, and even small amphibians that venture near the water's surface. Replicating that carnivorous profile in captivity is essential for sustained growth, proper skeletal development, and the intense coloration that makes these fish so prized.

Protein should make up the largest share of an Arowana's diet, generally in the range of 40 to 50 percent of total intake by dry weight. Fat content matters too — moderate levels support energy reserves and organ function, but excessive fat can lead to fatty liver disease, one of the most common nutritional disorders in captive Arowanas. Balancing protein and fat is far more important than simply maximizing either one.

Vitamins and minerals round out the nutritional picture. Calcium and phosphorus support bone density and scale integrity, while vitamins A and D contribute to immune function and pigment development. Because Arowanas are large, long-lived fish, even minor deficiencies can compound over years into serious health problems. A varied diet is the single best hedge against nutritional gaps.

Juvenile Arowanas have different caloric demands than adults. Young fish are growing rapidly and benefit from more frequent feedings with a slightly higher protein ratio. As the fish matures and growth slows, portion sizes and feeding frequency should be adjusted downward to prevent obesity without sacrificing nutritional completeness.

When evaluating commercial foods for Arowanas, the ingredient list tells you almost everything you need to know. Whole fish meal, shrimp meal, or insect-derived proteins should appear at or near the top. Fillers like wheat flour and soy derivatives add bulk but little nutritional value for a strict carnivore, and they can cloud water quality as undigested material breaks down.

Pellet size is a practical consideration that gets overlooked. Arowanas are surface feeders with large mouths, so undersized pellets often sink before the fish can collect them, leading to waste accumulation on the substrate. Look for floating pellets or sticks specifically formulated for large predatory fish. The pellet should hold its shape at the surface long enough for the Arowana to strike.

Color-enhancing formulations are widely marketed for Arowanas, particularly for red and gold varieties. These products typically rely on natural carotenoids like astaxanthin or canthaxanthin. While these pigments can support existing color potential, they will not transform a fish's genetics. Evaluate color-enhancing claims critically and prioritize overall nutritional balance over cosmetic promises.

Shelf life and storage instructions deserve attention as well. Fish foods degrade once opened — fats oxidize, vitamins lose potency, and moisture can introduce mold. Buy quantities you can use within a reasonable timeframe and store opened containers in cool, dry conditions with a tight seal.

Floating pellets and sticks designed for large carnivorous fish are the backbone of most captive Arowana diets. These products are convenient, nutritionally consistent, and far easier to dose accurately than live prey. A high-quality pellet with whole fish protein as the primary ingredient, moderate fat content, and added vitamins can serve as 60 to 70 percent of an adult Arowana's total diet.

Granule size varies across product lines, and matching the pellet to your fish's current size prevents both choking hazards in juveniles and frustrating micro-meals for full-grown adults. Many manufacturers offer size-graded options within the same formula, making it easy to scale up as your Arowana grows. Transition between sizes gradually so the fish adjusts to the new food shape.

Some dry foods incorporate probiotics or immune-support additives. While the research on probiotic efficacy in ornamental fish is still developing, these formulations generally do no harm and may offer marginal digestive benefits. They are worth considering if your Arowana has a history of digestive sensitivity, but they are not a substitute for clean water and a varied diet.

Pellet acceptance can be an issue with Arowanas that were raised on live food exclusively. Transitioning a reluctant feeder to dry food takes patience. Start by mixing pellets with familiar foods, gradually increasing the pellet ratio over several weeks. Soaking pellets briefly before feeding can soften the texture and make them more appealing during the transition period.

Live and frozen foods tap into the Arowana's predatory instincts and provide nutritional variety that pellets alone cannot match. Common choices include feeder shrimp, crickets, mealworms, and small freshwater fish. These foods deliver whole-prey nutrition — bones, organs, and exoskeletons — which supplies micronutrients that processed foods may lack.

The safety of live feeders is a legitimate concern. Feeder fish sourced from poorly managed facilities can carry parasites, bacteria, or residual medications. If you choose to offer live fish, quarantine them for at least a week before feeding and avoid wild-caught specimens unless you can verify the water source. Gut-loading feeder insects with nutritious greens for 24 to 48 hours before offering them to your Arowana significantly boosts their nutritional value.

Frozen foods offer many of the same benefits as live prey with substantially less risk. Flash-frozen shrimp, silversides, and bloodworms are widely available and can be stored for months. Thaw frozen items in a small container of tank water before feeding — never microwave or use hot water, as this destroys nutrients and can alter the texture enough to cause rejection.

Variety matters more than any single food item. Rotating between two or three live or frozen options throughout the week prevents nutritional fixation and keeps the Arowana engaged at feeding time. A fish that only eats one food type is both nutritionally vulnerable and more difficult to treat if that food source becomes unavailable.

Treats serve a dual purpose for Arowanas: they add dietary variety and they can be used as behavioral enrichment. Occasional offerings of whole shrimp with the shell on, large crickets, or superworms give the fish an opportunity to exercise its hunting response and jaw strength. Treats should account for no more than 10 to 15 percent of total weekly intake to avoid unbalancing the core diet.

Vitamin supplements formulated for ornamental fish can fill gaps that even a varied diet might leave. Liquid vitamin concentrates designed to be soaked into pellets or applied to frozen foods are the most practical delivery method. Focus on fat-soluble vitamins like A, D, and E, which are critical for scale health, immune function, and reproductive viability in mature Arowanas.

Calcium supplementation is sometimes recommended for Arowanas showing signs of scale irregularities or jaw deformities. Offering whole prey items with intact skeletal structures — shell-on shrimp, small crayfish — is a natural way to boost calcium intake without resorting to powdered supplements that can be difficult to dose accurately.

Avoid the temptation to treat your Arowana with mammalian proteins like beef heart or chicken. While these foods are sometimes recommended in older care guides, they contain fats that fish metabolize poorly. Over time, mammalian fats can accumulate in the liver and contribute to organ damage. Stick to aquatic and insect-based proteins for both staple and treat feeding.

Certain foods that seem logical for a large predatory fish are actually harmful to Arowanas in the long run. Mammalian meats — including beef heart, chicken liver, and pork — top the list. These proteins contain saturated fats and lipid profiles that fish cannot process efficiently, leading to fatty deposits in the liver and other organs over months or years of regular feeding.

Feeder goldfish are one of the most commonly offered live foods and one of the worst choices. Goldfish contain thiaminase, an enzyme that destroys vitamin B1. Chronic thiaminase exposure leads to neurological problems, loss of coordination, and eventually death. If you want to offer live fish, choose species that do not produce thiaminase, such as guppies or mollies, and always quarantine them first.

Processed human foods — bread, crackers, chips, or anything seasoned — should never enter an Arowana tank. These items contain salts, preservatives, oils, and carbohydrates that are entirely foreign to a predatory fish's digestive system. Even small amounts can disrupt gut flora and degrade water quality rapidly.

Overfeeding is itself a food to avoid, in a sense. Arowanas will eat as much as they are offered, and their appetite is not a reliable indicator of their actual caloric needs. Obesity in Arowanas shortens lifespan, stresses internal organs, and makes the fish more susceptible to bacterial infections. Disciplined portion control is one of the most important feeding decisions you can make.

Juvenile Arowanas under 12 inches should be fed two to three times daily in small portions. At this stage, rapid growth demands consistent caloric input, and spreading meals across the day helps prevent digestive overload. Each feeding should be consumed within two to three minutes — uneaten food should be removed promptly to maintain water quality.

As the Arowana reaches the 12- to 18-inch range, reduce feedings to once or twice daily. The fish's growth rate is slowing and its metabolic needs are shifting. Continuing to feed at juvenile frequency is one of the most common causes of obesity in sub-adult Arowanas. Adjust portions so the fish's body maintains a streamlined profile without visible belly distension.

Adult Arowanas over 18 inches generally do well on a single daily feeding, with one fasting day per week. The fasting day allows the digestive system to clear fully and mimics the irregular feeding patterns wild Arowanas experience. Many experienced keepers report improved activity levels and coloration after implementing a regular fasting schedule.

Consistency in feeding time matters more than the specific hour you choose. Arowanas are intelligent fish that quickly learn to anticipate meals, and a predictable schedule reduces stress. If you feed at different times every day, the fish may become agitated during long gaps or refuse food offered outside its expected window. Pick a time that works with your routine and stick to it.