Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Megaclassis: Osteichthyes
Superclassis/Classis: Actinopterygii
Classis/Subclassis: Actinopteri
Subclassis/Infraclassis: Neopterygii
Infraclassis: Teleostei
Megacohors: Osteoglossocephalai
Supercohors: Clupeocephala
Cohors: Euteleosteomorpha
Subcohors: Neoteleostei
Infracohors: Eurypterygia
Sectio: Ctenosquamata
Subsectio: Acanthomorphata
Divisio/Superordo: Acanthopterygii
Subdivisio: Percomorphaceae
Series: Ovalentaria
Superordo: Cichlomorphae
Ordo: Cichliformes
Familia: Cichlidae
Subfamilia: Pseudocrenilabrinae
Tribus: Haplochromini
Genus: Haplochromis
Species: Haplochromis vonlinnei
Name
Haplochromis vonlinnei van Oijen & de Zeeuw, 2008
Holotype: RMNH 83843. [Paratypes: RMNH 73787 (1), 83844 (1), 83845 (1), 83846 (1)].
Type locality: Mwanza Gulf, Tanzania, Lake Victoria, trawled.
References
van Oijen, M. J. P. & M.P. de Zeeuw 2008: Haplochromis vonlinnei spec. nov., a piscivorous haplochromine cichlid (Teleostei, Perciformes) from the Mwanza Gulf area of Lake Victoria, Tanzania. Zoologische Mededelingen (Leiden), 82(17): 167–175.
van Oijen, M. J. P. 1996: The generic classification of the haplochromine cichlids of Lake Victoria, East Africa. Zoologische Verhandelingen (Leiden), 302: 57–110.
Haplochromis vonlinnei in FishBase,
Froese, R. & Pauly, D. (eds.) 2024. FishBase. World Wide Web electronic publication, www.fishbase.org, version 02/2024.
Haplochromis vonlinnei is a species of cichlid endemic to Lake Victoria. It is greyish in color with a distinct mid-lateral band, and a rather slender shape. It feeds mainly on smaller fish. This species can reach a length of 15.9 centimetres (6.3 in) SL.[2] The population of the species has declined due to the introduction of the Nile perch in the 1950s. It has not been recorded since 1980 and the IUCN lists it as "Critically Endangered" and considers it may already be extinct. This fish is named in honour of the Swedish naturalist, Carl Linnaeus.
Description
Haplochromis vonlinnei is a moderate-sized, slender cichlid with an acute snout, slightly protruding lower jaw and curved teeth. It is a greyish color with a narrow, intermittent blackish dorsal-lateral band and a broader, more distinct mid-lateral band. The flanks are yellowish and the belly white. In the male, the anal fin is grey with two to four bright orange circular spots with thin white rims (egg dummies). In the female, the anal fin is yellowish with two darker yellow spots. Haplochromis vonlinnei ranges in size from 115 to 159 mm (4.5 to 6.3 in).[3]
Among other fish in the genus Haplochromis found in Lake Victoria, it is similar in shape to H. pyrrhopteryx but differs in colouring as that species lacks a mid-lateral band. It also resembles H. altigenis in morphology, but that species has a differently shaped head and less-curved teeth.[3]
Distribution and habitat
Haplochromis vonlinnei is endemic to Lake Victoria where it is known from the Mwanza Gulf region in Tanzania. It is presumed to be a demersal fish and is found near the lakebed over muddy substrates at depths between 5.5 and 18 m (18 and 59 ft).[3]
Status
The Nile perch (Lates niloticus) was introduced into Lake Victoria in the 1950s with the objective of making the lake fisheries more productive.[4] It is a fish-eating predator and since its introduction, many species of cichlid in the genus Haplochromis have suffered significant declines in number, and Haplochromis vonlinnei is one of these.[1] The fish was already uncommon in the 1970s, and it has not been recorded since 1980, when several specimens were caught by trawling during a survey undertaken by Tanzania. The IUCN has listed Haplochromis vonlinnei as being "Critically Endangered" and suggests it is either exceedingly rare with very few individuals remaining, or may already be extinct.[1] Another factor that may affect any remaining fish is the diminished clarity of the water which may make mate recognition more difficult.[1]
References
Witte, F.; de Zeeuw, M.P.; Brooks, E. (2010). "Haplochromis vonlinnei". IUCN Red List of Threatened Species. 2010: e.T185813A8483086. doi:10.2305/IUCN.UK.2010-3.RLTS.T185813A8483086.en. Retrieved 19 November 2021.
Froese, Rainer; Pauly, Daniel (eds.) (2013). "Haplochromis vonlinnei" in FishBase. November 2013 version.
van Oijen, M.J.P.; de Zeeuw, M.P. (2008). "Haplochromis vonlinnei spec. nov., a piscivorous haplochromine cichlid (Teleostei, Perciformes) from the Mwanza Gulf area of Lake Victoria, Tanzania" (PDF). Repository.naturalis.nl. Retrieved 2014-05-20.
Pringle, Robert M. (2005). "The Nile Perch in Lake Victoria: Local Responses and Adaptations". Africa: Journal of the International African Institute. 75 (4): 510–538. doi:10.3366/afr.2005.75.4.510. ISSN 0001-9720. JSTOR 3556959. S2CID 7566999.
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