Recent from talks
Hydrocynus goliath
Knowledge base stats:
Talk channels stats:
Members stats:
Hydrocynus goliath
Hydrocynus goliath, commonly known as the goliath tigerfish, giant tigerfish, or mbenga, is a large species of African predatory freshwater fish in the family Alestidae. It is native to the Congo River Basin and Lake Tanganyika in Africa.
The goliath tigerfish is one of five recognized African species of the Hydrocynus genus and is found in the Congo River Basin (including Lualaba River and Lake Upemba), and Lake Tanganyika. The type locality is the city of Mbandaka in the Main Congo, where it was discovered in 1898 by French explorer Boulenger. They are typically found in highly oxygenated fast-flowing waters such as those found in deep river channels and open lakes, making them strong swimmers able to capture prey even in turbulent waters.
A 2011 study which reconstructs the phylogenetic history of genus Hydrocynus using comparisons of a protein-coding gene called cytochrome b, revealed several mtDNA clades in this region, suggesting a higher tigerfish species richness than traditionally recognized. The study's analyses indicate that populations of H. goliath may have been prevented from upstream dispersal in the geologic past by knickpoints, or sharp changes in the channel bed slope, in the Luvua river. This prevention of upstream dispersal would restrict H. goliath to the Congo River Basin as reflected in the modern range of the species. Four additional species (H. vittatus and three unknown species) appear to be present in this Basin, while two (H. vittatus and an unknown species) appear to be present in Lake Tanganyika.
Based on the study's sequence comparisons, H. goliath possesses low nucleotide diversity, suggesting that existing populations originate from a historically small effective population which underwent rapid population growth at some point in the past. Additionally, a high haplotype diversity value indicates that its expansion may have undergone a more recent expansion in its population range and size.
The goliath tigerfish has a characteristic silvery gray dorsum and flanks, with a thunniform body plan similar to that of tuna, featuring black adipose fins. The goliath tigerfish is described as the "Monster Fish of the Congo" by a 2008 documentary by National Geographic, a reflection of its monster-like qualities and of its perception by local people and hunters. This large-toothed, highly predatory fish grows to an average length of 1.5 m (4.9 ft) and a weight of 50 kg (110 lb). The largest recorded specimen weighed 70 kg (154 lb), and they can reach a maximum recorded length of about 2 m (6.6 ft), making them the largest of the tigerfish of genus Hydrocynus.
In addition to being the largest in body size of their genus, they also have incredibly large conical teeth. Due to their predatory nature, they possess well-developed pharyngeal teeth similar to those of sharks and piranhas. Their teeth are spaced out along the jaw and shaped like daggers in order to facilitate biting pieces out of prey fish or tearing prey into smaller pieces for digestion. The premaxilla holds six to seven teeth while the dentary or lower jaw holds five, for a total of 12 to 20 upper teeth plus 8 to 14 lower teeth. Its teeth fit into distinct grooves along its jaws, interlocking together with the smallest teeth found at the very back of the jaws. In each jaw quadrant, all teeth are replaced at the same time over the course of about five days. On average each of its teeth can grow up to 2.5 cm (1 in), according to biologist and television presenter Jeremy Wade, which is comparable to the tooth size of a Great White shark. These massive jaws and teeth are what sets this species apart from all other tigerfish of the genus Hydrocynus and make for easy identification, especially given its endemism to the Congo Basin.
Despite being mostly solitary hunters, female goliath tigerfish migrate together and breed near each other on riverbanks or lakeshores. Thousands of eggs are laid among thick vegetation to protect the eggs and the young from predators, given that goliath tigerfish are not attentive parents. Infant fish feed on animal plankton during their larval stage before transitioning to small fish and eventually an adult diet of larger fish. Juvenile fish grow quite slowly, averaging four to six inches of growth per year. It can take up to ten years for a juvenile tigerfish to reach its full adult size.
Hydrocynus goliath is a piscivore, feeding on any fish it can overpower, including smaller members of the same species. Their huge, powerful, rigid teeth make them one of the most ferocious predators of the Congo basin, dangerous for the smaller fish they prey on as well as for the hunters who attempt to capture them for sport and for food.[citation needed] They have been known to attack larger animals, taking "chunks" out of large fish, crocodiles, humans, or even each other in desperate times.
Hub AI
Hydrocynus goliath AI simulator
(@Hydrocynus goliath_simulator)
Hydrocynus goliath
Hydrocynus goliath, commonly known as the goliath tigerfish, giant tigerfish, or mbenga, is a large species of African predatory freshwater fish in the family Alestidae. It is native to the Congo River Basin and Lake Tanganyika in Africa.
The goliath tigerfish is one of five recognized African species of the Hydrocynus genus and is found in the Congo River Basin (including Lualaba River and Lake Upemba), and Lake Tanganyika. The type locality is the city of Mbandaka in the Main Congo, where it was discovered in 1898 by French explorer Boulenger. They are typically found in highly oxygenated fast-flowing waters such as those found in deep river channels and open lakes, making them strong swimmers able to capture prey even in turbulent waters.
A 2011 study which reconstructs the phylogenetic history of genus Hydrocynus using comparisons of a protein-coding gene called cytochrome b, revealed several mtDNA clades in this region, suggesting a higher tigerfish species richness than traditionally recognized. The study's analyses indicate that populations of H. goliath may have been prevented from upstream dispersal in the geologic past by knickpoints, or sharp changes in the channel bed slope, in the Luvua river. This prevention of upstream dispersal would restrict H. goliath to the Congo River Basin as reflected in the modern range of the species. Four additional species (H. vittatus and three unknown species) appear to be present in this Basin, while two (H. vittatus and an unknown species) appear to be present in Lake Tanganyika.
Based on the study's sequence comparisons, H. goliath possesses low nucleotide diversity, suggesting that existing populations originate from a historically small effective population which underwent rapid population growth at some point in the past. Additionally, a high haplotype diversity value indicates that its expansion may have undergone a more recent expansion in its population range and size.
The goliath tigerfish has a characteristic silvery gray dorsum and flanks, with a thunniform body plan similar to that of tuna, featuring black adipose fins. The goliath tigerfish is described as the "Monster Fish of the Congo" by a 2008 documentary by National Geographic, a reflection of its monster-like qualities and of its perception by local people and hunters. This large-toothed, highly predatory fish grows to an average length of 1.5 m (4.9 ft) and a weight of 50 kg (110 lb). The largest recorded specimen weighed 70 kg (154 lb), and they can reach a maximum recorded length of about 2 m (6.6 ft), making them the largest of the tigerfish of genus Hydrocynus.
In addition to being the largest in body size of their genus, they also have incredibly large conical teeth. Due to their predatory nature, they possess well-developed pharyngeal teeth similar to those of sharks and piranhas. Their teeth are spaced out along the jaw and shaped like daggers in order to facilitate biting pieces out of prey fish or tearing prey into smaller pieces for digestion. The premaxilla holds six to seven teeth while the dentary or lower jaw holds five, for a total of 12 to 20 upper teeth plus 8 to 14 lower teeth. Its teeth fit into distinct grooves along its jaws, interlocking together with the smallest teeth found at the very back of the jaws. In each jaw quadrant, all teeth are replaced at the same time over the course of about five days. On average each of its teeth can grow up to 2.5 cm (1 in), according to biologist and television presenter Jeremy Wade, which is comparable to the tooth size of a Great White shark. These massive jaws and teeth are what sets this species apart from all other tigerfish of the genus Hydrocynus and make for easy identification, especially given its endemism to the Congo Basin.
Despite being mostly solitary hunters, female goliath tigerfish migrate together and breed near each other on riverbanks or lakeshores. Thousands of eggs are laid among thick vegetation to protect the eggs and the young from predators, given that goliath tigerfish are not attentive parents. Infant fish feed on animal plankton during their larval stage before transitioning to small fish and eventually an adult diet of larger fish. Juvenile fish grow quite slowly, averaging four to six inches of growth per year. It can take up to ten years for a juvenile tigerfish to reach its full adult size.
Hydrocynus goliath is a piscivore, feeding on any fish it can overpower, including smaller members of the same species. Their huge, powerful, rigid teeth make them one of the most ferocious predators of the Congo basin, dangerous for the smaller fish they prey on as well as for the hunters who attempt to capture them for sport and for food.[citation needed] They have been known to attack larger animals, taking "chunks" out of large fish, crocodiles, humans, or even each other in desperate times.
Recent media