Microthrissa royauxi

Microthrissa royauxi, the royal sprat, is a species of pelagic, freshwater fish from the herring family Clupeidae which is found in the Congo River basin in west Africa. It was described in 1902 by the Belgian-British zoologist George Albert Boulenger.[2] It is of limited importance as a food fish in subsistence fisheries and its conservation status is Least Concern.[1]

Microthrissa royauxi
Mounted specimen of Microthrissa royauxi in the Royal Museum for Central Africa

Least Concern  (IUCN 3.1)[1]
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Clupeiformes
Family: Clupeidae
Genus: Microthrissa
Species:
M. royauxi
Binomial name
Microthrissa royauxi
Synonyms[2]
  • Pellonula royauxi Boulenger, 1902

Naming and taxonomy

Microthrissa royauxi was named by George Albert Boulenger in 1902 from specimens taken in the Ubangi. Its name is from micro small and thrissa from the Greek word for a type of anchovy. The specific name royauxi is in honor of Capitaine Louis Joseph Royaux (1866–1936), who led the expedition that collected the type specimen and supplied indigenous names of many of the species the expedition collected.[3] It is the type species of the genus Microthrissa.[4]

Description

Microthrissa royauxi is a small fish with a rather deep body, the height of the body being roughly a third of the length with a fairly pointed snout, lacking a projecting lower jaw. It has strongly keeled scutes 1 or 2 rows before the base of the first pectoral fin ray. In this and other species of West African freshwater clupeid the jaw anatomy is important in identification and this species has rather narrow jaws compared to its relatives.[4] The maximum length is 9.9 cm,.[5] although 8 cm appears to be the average length.[4]

Distribution

Microthrissa royauxi is found in the middle Congo River basin, including the Ubangi system but not the Kasai, it has been recorded from the Democratic Republic of the Congo, Congo, Central African Republic and Cameroon.[5] This species has been recorded from Pool Malebo (Stanley Pool) and the central Congo River basin, as well as the Lualaba River at Kindu.[1]

Evolution

The clupeids are largely marine, the sub-family that Microthrissa royauxi is a member of, the Pellonulinae, are common in southern and western Africa, for example Limnothrissa miodon in Lake Tanganyika and Potamothrissa acuitirostris in the Congo Basin. Molecular phylogenetic reconstructions indicate that the ancestors of these freshwater Pellonulines colonised West Africa 25–50 million years ago, at the end of a major marine incursion in the region. Pellonuline herring subsequently speciated in an evolutionary radiation in West Africa, and spread across the continent and colonising its freshwater bodies.[6]

Habitat

Microthrissa royauxi is a pelagic fish of large rivers.[1]

Fisheries

Microthrissa royauxi makes a small contribution to the catches of local fishermen,[4] it is caught mainly by subsistence fishermen.[5]

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References
  1. "Microthrissa royauxi". IUCN Red List of Threatened Species. Retrieved 4 October 2016.
  2. "Synonyms of Microthrissa royauxi Boulenger, 1902". FishBase. Retrieved 4 October 2016.
  3. "Order CLUPEIFORMES (part 2 of 2)". The ETYFish Project. Christopher Scharpf and Kenneth J. Lazara. Retrieved 4 October 2016.
  4. Food and Agriculture Organization of the United Nations (1988). "FAO Species Catalogue: Clupeoid Fishes of the World (Suborder Clupeoidei): An Annotated and Illustrated Catalogue of the Herrings, Sardines, Pilchards, Shads Anchovies and Wolf-herrings Part 1 Chirocentridae, Clupeidae and Pristigasteridae". FAO Fisheries Synopsis No.125. 7 (1).
  5. "Microthrissa royauxi Boulenger, 1902 Royal sprat". Fishbase. Retrieved 4 October 2016.
  6. Wilson, Anthony B.; Teugels, Guy G.; Meyer, Axel (2008). "Marine Incursion: The Freshwater Herring of Lake Tanganyika Are the Product of a Marine Invasion into West Africa". PLoS ONE. 3 (4): e1979. doi:10.1371/journal.pone.0001979. PMC 2292254. PMID 18431469.
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