Blacktip Reef Shark
Carcharhinus melanopterus
The blacktip reef shark (Carcharhinus melanopterus) is an active, viviparous requiem shark highly abundant in shallow tropical coral reefs. Easily identified by the prominent black tips on its fins bordered in white, it is an inquisitive apex predator that feeds primarily on small bony fish, crustaceans, and cephalopods.
Water Temperature
24 - 28 °C
pH Value
8.1 - 8.4
Water type
Freshwater
Tank level
All levels
Adult size
160 cm
Minimum tank volume
>= 500 L
Minimum group
>= 1
GH
8 - 12 dGH
KH
4 - 6 dKH
TDS
160 - 240 ppm
Conductivity
250 - 375 uS/cm
Species description
Geographical Origin and Habitat: Widespread throughout the tropical Indo-Pacific. Inhabits shallow coral reefs, flat sandy lagoons, and mangrove swamps. It is a coastal apex predator that often ventures into waters so shallow its dorsal fin is exposed, hunting crustaceans and small fish among mangrove roots.
Taxonomy and Morphology: Requiem shark of the Carcharhinidae family (Blacktip reef shark). Possesses a robust torpedo body, short and rounded snout. The unmistakable feature is the conspicuous black tips edged in white on all fins, particularly the first dorsal and caudal. In captivity, it rarely exceeds 160 cm (5.2 feet), but in the wild approaches 2 meters.
Social Behavior: Active and darting. Often forms small wandering hierarchical groups, especially during feeding or in nurseries. Extremely nervous and shy towards humans; tends to swim away quickly unless conditioned by food.
Coloration and Sexual Dimorphism: Brownish-gray or yellowish-brown back to blend with sandy bottoms viewed from above; pure white belly. The tips of each fin are marked with intense, ink-like black. Males are recognized by the presence of claspers under the pelvic fins, visible from a young age.
Care, breeding and tankmates
Aquarium Setup: Species NOT suitable for home aquariums. Requires public ocean tanks or cylindrical/oval tanks of tens of thousands of liters to prevent fatal collisions. The bottom must be fine sand, devoid of sharp rocky decorations that could flay its skin. A very strong circular water flow is imperative for respiration (ram ventilation).
Diet and Feeding: Active predator. The diet consists of cephalopods (squid, octopus), crustaceans, and bony fish (mullet, grouper). In large aquariums, it must be fed via long tongs with chunks of lean fish (hake, cod, salmon) supplemented with specific shark vitamins (especially iodine and vitamin C) to prevent thyroid goiter.
Water Quality: Extremely sensitive to water quality. Oceanic temperature: 24-28 °C (75-82 °F). Standard marine salinity (SG 1.023-1.026). Extremely high need for dissolved oxygen and colossal filtration with gigantic protein skimmers to remove massive nitrogenous waste (urea) without affecting the alkaline pH (8.1-8.4).
Compatibility and Cohabitation: In immense tanks, coexists with large Trevallies, Batfish (Platax), giant groupers, and other species of sharks or benthic rays. Will inevitably ingest any fish smaller than its mouth or in distress. Absolutely incompatible with slow fish or those with venomous spines (Lionfish) that could kill it during a predation attempt.
Aquarium Breeding: Viviparous placental (a rarity among fish). After a gestation of 10-16 months (depending on water temperature), the female gives birth to 2 to 4 live, fully independent pups in very shallow waters. Reproduction has been successfully recorded in several large public aquariums.
Risks and Diseases: Unsuited for confined spaces: bumps into glass causing damage to the rostrum resulting in fatal bacterial infections. Vulnerable to "goiter" (iodine deficiency) and monogenean parasites on the gills. Excess nitrates lead to lethargy, food refusal, and death in a few weeks.
Geographic Origin and Distribution
Widespread throughout the tropical Indo-Pacific. Inhabits shallow coral reefs, flat sandy lagoons, and mangrove swamps. It is a coastal apex predator that often ventures into waters so shallow its dorsal fin is exposed, hunting crustaceans and small fish among mangrove roots.
Origin
Cosmopolitan or introducedTropical oceans and reefs
Fish profile
- Temperament
- Semi-aggressive
- Blacktip Reef Sharks are active, fast-swimming predators that are generally timid but can become territorial or bold as they mature. They are not aggressive towards humans unless provoked, but they possess a strong predatory drive toward smaller marine animals. In restricted spaces, they can display dominance behaviors or become stressed, which may lead to accidental collisions with tank walls. Providing a stress-free environment with plenty of space is essential to maintain their natural, relatively calm behavior.
- Diet
- Omnivore
- As obligate carnivores, Blacktip Reef Sharks require a varied diet consisting of high-quality marine proteins such as whole fish, squid, shrimp, crabs, and clams. Food items should be fresh or properly thawed, and must be supplemented with specialized shark vitamins, particularly iodine, to prevent goiter, a common thyroid condition in captive elasmobranchs. Feeding should be carefully managed using feeding tongs to monitor individual intake and ensure they do not consume contaminated food. A balanced diet is fundamental to supporting their high metabolic needs and maintaining strong immune systems.
- Life expectancy
- 12-25 years
- In the wild, the average lifespan of Carcharhinus melanopterus is estimated to be between 10 and 15 years. However, when maintained in large, professional public aquariums under optimal care, their lifespan can reach 20 to 25 years or even longer. Achieving this longevity requires meeting their strict environmental demands, including flawless water quality, a balanced diet, and massive swimming space. Regular health monitoring and minimizing environmental stressors are critical factors in maximizing their captive lifespan.
- Adult size
- 160 cm
- The catalog's scalar value is 160 cm. The FishBase SPECIES table (v25.04 snapshot) source reports a maximum adult measurement of 200 cm for this species, recorded as total length (TL). The taxonomic record consulted is Carcharhinus melanopterus (v25.04); male or unsexed record. These figures are not interchangeable: the first is the profile's editorial reference, whereas the second is a published maximum under a specific measurement convention; differences among sources can reflect sex, population, life stage and measuring method.
- Sex ratio
- Group
- In captivity, Blacktip Reef Sharks are often kept individually or in female-only groups to prevent mating-related aggression. If a mixed-sex group is planned, a harem structure with one male to multiple females is recommended to distribute the male's aggressive courtship behavior. During courtship, males frequently bite the pectoral fins of females, which can lead to severe injuries in confined spaces. Therefore, maintaining a high male-to-female ratio should be strictly avoided to ensure a peaceful tank dynamics.
- Feeding frequency
- Twice daily
- In captivity, adult Blacktip Reef Sharks are typically fed 2 to 3 times per week to prevent obesity and limit water pollution from excess waste. Juveniles require more frequent feeding, usually daily or every other day, to support their rapid growth phases. Overfeeding can lead to hepatic lipidosis and other metabolic disorders, so food portions must be calculated based on the shark's weight. Consistent feeding schedules help stabilize their behavior and reduce the likelihood of food-associated aggression toward tank mates.
- Bioload
- Extreme
- Carcharhinus melanopterus is a large, highly active predator with a fast metabolism, producing an extreme amount of biological waste. To maintain optimal water quality, an exceptionally robust filtration system is mandatory, including high-capacity protein skimmers, ozone generators, and large wet-dry sumps. Frequent, massive water changes and intensive mechanical filtration are also required to handle the heavy waste load. Without such measures, rapidly deteriorating water conditions will quickly lead to severe health issues in this sensitive elasmobranch.
- Flow
- Stagnant
- Carcharhinus melanopterus requires strong and continuous water flow to support its active lifestyle and facilitate respiration. Because they are obligate ram ventilators, they must move forward or face a strong current to force oxygenated water over their gills. The tank design should incorporate directional water jets or heavy-duty wavemakers to create a laminar flow pattern. This constant flow not only aids their breathing but also helps tone their muscles and mimics their natural reef habitat.
- Jump risk
- Yes
- Although they are heavy animals, Blacktip Reef Sharks pose a significant jump risk, especially when startled, during feeding frenzies, or if kept in shallow pools. They can easily leap out of the water or accidentally thrash near the surface, potentially landing outside the tank. To prevent fatal escapes, the enclosure must feature high containment walls or a secure, heavy-duty cover system. Proper lighting acclimation and avoiding sudden movements around the tank can also reduce the risk of panic-induced jumping.
- Reproduction
- Oviparous
- Blacktip Reef Sharks are viviparous, meaning they give birth to live young nourished by a yolk-sac placenta. The gestation period lasts between 7 and 11 months, after which the female gives birth to a small litter of 2 to 4 pups. Breeding this species in captivity is extremely difficult and is almost exclusively achieved in massive public aquariums. The main obstacles are providing sufficient space for courtship swimming and ensuring the safety of the newborn pups, which are easily preyed upon or injured if not separated immediately.
- Compatibility & tankmates
- This species has very limited compatibility due to its predatory nature and large size. They should only be housed with large, fast-moving marine fish such as groupers, snappers, large jacks, or pilot fish that cannot be easily swallowed. Absolutely avoid keeping them with small fish, invertebrates, or slow-moving bottom dwellers, which will inevitably be consumed or injured. Additionally, do not mix them with highly aggressive sharks or large teleosts that could outcompete or stress them in the enclosure.
- Tank level
- All levels
- Being obligate ram ventilators, Blacktip Reef Sharks must swim continuously to breathe and will utilize all levels of the water column. However, they are most frequently observed cruising in the middle to upper zones of the tank, where they have clear swimming lanes. In very shallow systems, they will naturally swim near the surface, while occasionally scanning the bottom for food. A spacious, open swimming layout without obstructive rockwork is vital to accommodate their constant, multi-level swimming pattern.
Scientific Parameters & Models
FishBase
Window to the official scientific data of the species
Data synced on: 06/15/2026
- Trophic level
- 3.9 ± 0.4 se
- Resilience
- Low (4.5 - 14 years)
- Generation time
- 4.4 years
- Phylogenetic uniqueness (PD50)
- 0.5
- Bayesian Length-Weight
- a = 0.00468, b = 3.03
- VulnerabilityHigh vulnerability (57 / 100)
Image gallery
Licensed images linked to the species or, when marked, to the closest representative taxon.
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