John Treadwell Nichols was an American ichthyologist and ornithologist.
Neobola stellae is a species of ray-finned fish in the family Cyprinidae. It is endemic to Lake Turkana in Ethiopia and Kenya. It can reach a maximum length of 2.3 cm.
The bluelip haplo is a species of fish in the family Cichlidae. It is found in Burundi, the Democratic Republic of the Congo, Tanzania, and Zambia.
Distichodus petersii is a species of fish in the family Distichodontidae. It is endemic to Tanzania. Its natural habitat is rivers.
Greenwoodochromis christyi is a species of fish in the family Cichlidae. It is endemic to the deeper water of southern Lake Tanganyika. The specific name of this fish honours the explorer and naturalist Cuthbert Christy (1863-1932).
Haplochromis worthingtoni is a species of cichlid endemic to Lake Kyoga in Uganda. This species reaches a length of 14.1 centimetres (5.6 in) SL. The specific name honours the explorer E. Barton Worthington (1905–2001) who collected the type of this species with type with Michael Graham.
Julidochromis dickfeldi is a species of cichlid endemic to Lake Tanganyika in Africa where it is only known from the southwestern portion. This species inhabits areas with rock/rubble substrates, each fish maintaining a territory around a crevice or crack. This species reaches a length of 11 centimetres (4.3 in) TL. The specific name honours the German fishkeeper Alf Dickfeld who proposed the expedition on which the type was collected.
Lamprologus lemairii is a species of cichlid endemic to Lake Tanganyika where it prefers to lurk by rocks or on the lake bed waiting for fish to prey on. This species can reach a length of 25 centimetres (9.8 in) TL. The specific name of this fish honours the leader of the Congo Free State expedition which collected the type, Lieutenant Charles Lemaire (1863-1925).
Lepidiolamprologus kendalli is a species of cichlid endemic to Lake Tanganyika preferring rocky areas. This carnivorous species preys upon fish. This species can reach a length of 18 centimetres (7.1 in) TL. It can also be found in the aquarium trade. The specific name honours the American fish ecologist Robert L. Kendall, who collected the type.
Neolamprologus wauthioni is a species of cichlid endemic to Lake Tanganyika where it inhabits snail shells. This species reaches a length of 5.5 centimetres (2.2 in) TL. The specific name of this cichlid honours René Wauthion, a Provincial Commissioner in the Belgian Congo during the Belgian Hydrobiological Mission to Lake Tanganyika of 1946–1947, this expedition collected the type.
The threadfin cichlid is a species of cichlid endemic to Lake Tanganyika found in areas with rocky substrates on which it can graze on algae. This species can reach a length of 18 cm (7.1 in). It can be found in the aquarium trade. The specific name of this cichlid honours the British ichthyologist Ethelwynn Trewavas (1900-1993).
Rhabdalestes leleupi is a species of fish in the family Alestidae. It is found in Kenya and Tanzania. Its natural habitats are rivers and freshwater lakes.
Chanodichthys dabryi, the humpback or lake skygazer, is a species of ray-finned fish in the genus Chanodichthys. This freshwater cyprinid is found in China and Russia where it ranges from the Amur River to the Yangtze. It is fished, but remains common. As presently defined, it is likely species complex. It reaches 42 cm in length and 700 g (1.5 lb) in weight.
Schistura nicholsi is a species of ray-finned fish, a stone loach, in the genus Schistura. It is found in the Mekong basin of north eastern Thailand, Laos and it is also likely to be found in Cambodia. It occurs in shallow riffles with moderate to fast flows. Human modification of the rivers' morphology through such activities as logging and agriculture are affecting this species range. However, its distribution covers a wide geographic range and it is assessed as Least Concern by the IUCN. The specific name honors John Treadwell Nichols (1883-1958) who was curator of fishes at the American Museum of Natural History and who made an important contribution to the ichthyology of China, and especially to the knowledge of loaches.
Enteromius brazzai is a species of ray-finned fish in the genus Enteromius which occurs in the central Congo Basin and some other rivers in Gabon, Central African Republic and Cameroon.
Hamilton's barb, also known as the plump barb, is a species of ray-finned fish in the genus Enteromius.
Pseudocrenilabrus nicholsi is a species of cichlid native to the Congo Basin in Africa. As other members of the genus Pseudocrenilabrus, it is a mouthbrooder. This species can reach a length of 8.5 centimetres (3.3 in) SL. The specific name honours the American ichthyologist John Treadwell Nichols (1883-1958) who was curator of fishes at the American Museum of Natural History. Nichols originally described this species as Paratilapia ventralis in 1928 but this name had already been used by George Albert Boulenger for another species of cichlid in 1898.
Lupinoblennius nicholsi, the highfin blenny, is a species of combtooth blenny found in the western Atlantic ocean, on the coasts of the Gulf of Mexico in north-eastern Mexico and Texas, it has also been recorded from Englewood, Florida. This species reaches a length of 6 centimetres (2.4 in) TL. The specific name honours the American ichthyologist John Treadwell Nichols (1883-1958).
Gnathopogon herzensteini is a species of ray-finned fish in the genus Gnathopogon endemic to China.
Gobiobotia nicholsi is a species of small freshwater fish in the family Cyprinidae. It is endemic to China.
