|Scientific Name:||Oreochromis lidole|
|Species Authority:||(Trewavas, 1941)|
|Taxonomic Notes:||Breeding males of O.lidole are jet black, with a white dorsal fin margin. O. lidole has the typical dark grey colour of its species, with long jaws and big, square operculum. Unlike the other two species, there is little geographical variation in morphology in O. lidole.|
|Red List Category & Criteria:||Endangered A2bd ver 3.1|
|Assessor(s):||Kazembe, J. & Makocho, P.|
|Reviewer(s):||Snoeks, J. (Freshwater Fish Red List Authority) & Darwall, W. (Freshwater Biodiversity Assessment Programme)|
Endemic to Lake Malawi, Lake Malombe and the Shire River. This species has experienced declines of more than 70% in the last 10 years as indicated from fisheries catch statistics. Information on the status of this species is available mainly for Lake Malawi, the Upper Shire and Lake Malombe (but it should be noted that direct observation finds that even in other parts of the Shire River chambo catches have declined over the past 10 years.The total chambo catch (for Lake Malawi, Upper Shire and Lake Malombe combined) in 1980 was 10,711 tons, increasing to 17,439 tons in 1982. However, by 1990 it had declined to 6,483 dropping further to 2,774 tons in 1996. This infers a reduction of more than 70% in the catches over a ten-year period. Further monitoring in southern Lake Malawi has found that chambo stocks have continued to decline at the same rate during 1994–1999. On the basis of this continuing decline the species is assessed as Endangered.
|Range Description:||Endemic to Lake Malawi, Lake Malombe and the Shire River.|
Native:Malawi; Mozambique; Tanzania, United Republic of
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||During the 1950s over 3,000 tonnes of Chambo per year (chiefly O. squamipinnis) were being taken from Lake Malawi's southeast arm alone. However, the total catch for chambo in this part of the lake has shown a steady decline since early 1990s. CPUE in the main harvesting fisheries has also declined dramatically due to over-fishing.In Lake Malombe chambo catches were around 4,000 tons in the late 1970s, increasing to over 6000 tons in the early 1980s. In the late 1980s a drastic decline was observed with catches falling to less than 600 tons per year by the early 1990’s and to less than 200 tons in the late 1990’s. This decline in total catch in Lake Malombe is directly matched by severe declines in CPUE in the two main fisheries harvesting the stock, namely gill nets and chambo seines. The Chambo stocks in Lake Malombe are considered to have been in a state of collapse or near collapse since the early 1990s.|
|Current Population Trend:||Decreasing|
|Habitat and Ecology:||This is one of the three 'Chambo' species endemic to Lake Malawi. Like other species of the subgenus Nyasalapia, males develop long branched genital 'tassels' that serve as egg dummies. Oreochromis lidole is believed to be the chambo species most adapted to deep water and feeding in the water column. It feeds on algae, detritus and zooplankton. The breeding season runs from September to March, peaking from October to February. Like other Oreochromis, they are maternal mouthbrooders. Males dig large spawning pits at depths of 17 m (50 feet) or more. These spawning pits can be up to 3 m in diameter, with central platforms as much as 75 cm wide. Breeding starts at about 28 cm TL at three years old. The spawning areas are located in deeper water than for the other two species, off clean sandy or rocky shores. Max. size: 38 cm TL.|
|Major Threat(s):||Over-fishing: the chambo are the most valuable food fishes in Malawi, but populations collapsed in the 1990s as a result of over-fishing.|
|Conservation Actions:||No information available.|
IUCN. 2004. 2004 IUCN Red List of Threatened Species. www.iucnredlist.org. Downloaded on 23 November 2004.
Manase, M.M., Mwenekibombwe, L.K., Namoto, W. and Mponda, O. 2002. Analysis of catch and effort data for the fisheries of southeast arm of Lake Malawi. Fisheries Bulletin 52: 1–17
Pålsson, O.K., Banda, M.C. and Bulirani, A. 1999. A review of biology, fisheries and population dynamics of chambo (Oreochromis spp. Cichlidae) in Lake Malawi and Malombe. Government of Malawi, Fisheries Bulletin 38: 1–35
Trewavas, E. 1983. Tilapiine fishes of the genera Sarotherodon, Oreochromis and Danakilia. Cornell University Press, New York, United States.
Turner, G.F. and Mwanyama, N.C. 1992. Distribution and biology of Chambo (Oreochromis spp) in Lakes Malawi and Malombe. In: FI:DP/MLW/86/013, Field Document No. 21.
Turner, G.F., Grimm, A.S., Mhone, O.K., Robinson, R.L. and Pitcher, T.J. 1991. The diet of Oreochromis lidole (Trewavas) and other chambo species in Lakes Malawi and Malombe. Journal of Fish Biology 39: 15–24
Weyl, O., Banda, M., Namoto, W. and Mwenekibombwe, L.H. 2001. Analysis of catch and effort data for the fisheries of Lake Malombe, 1976–1999. Fisheries Bulletin 45:
|Citation:||Kazembe, J. & Makocho, P. 2004. Oreochromis lidole. The IUCN Red List of Threatened Species 2004: e.T61276A12456642. http://dx.doi.org/10.2305/IUCN.UK.2004.RLTS.T61276A12456642.en . Downloaded on 09 October 2015.|