Rastrineobola argentea

Taxonomy

Assessment Information

Geographic Range

Population

Habitat and Ecology

Threats

Conservation Actions

Taxonomy [top]

Kingdom	Phylum	Class	Order	Family
ANIMALIA	CHORDATA	ACTINOPTERYGII	CYPRINIFORMES	CYPRINIDAE

Scientific Name:

Rastrineobola argentea

Species Authority

(Pellegrin, 1904)

Common Name/s:

English

–

Silver Cyprinid

Assessment Information [top]

Red List Category & Criteria:	Least Concern ver 3.1
Year Assessed:	2006
Assessor/s	Bayona, J.D.R.
Evaluator/s:	Snoeks, J. (Freshwater Fish Red List Authority) & Darwall, W. (Freshwater Biodiversity Assessment Programme)
Justification: Under heavy fishing pressure but it has a fairly large extent of occurrence; short generation time and hence rapid reproductive turnover and resilience. Does not appear to be adversely affected by the eutrophication problems of Lake Victoria (T.K. Twongo, pers. comm.., East Africa Freshwater Biodiversity Assessment workshop, Dec. 2003).

Geographic Range [top]

Range Description:	Endemic to the Lake Victoria drainage (Seegers et al. 2004).
Countries:	Native: Kenya; Tanzania, United Republic of; Uganda

Population [top]

Population:	Fishing yields indicate a rapid increase in population size. For example, Wanink (1998) reported an increase in yield from 1,000 metric tons in 1968 to over 80,000 metric tons in 1989 and acoustic surveys (1999–2001) have also indicated an increasing biomass (Ogutu Ohwayo et al. 2002).
Population Trend:	Increasing

Habitat and Ecology [top]

Habitat and Ecology:	Lake-wide pelagic distribution both inshore and offshore (Van Ojien 1995). Mostly observed in the 0-20m depth range but eggs and fry may be found down to 68m (Graham1929, Wannink 1998). Juvenile fish migrate away from the shore after spending their larval stage in shallow waters (Wanink 1999). Adults stay near the bottom during the day and rise to the surface at night (Witte and Winter 1995). Feeds on zooplankton (Fermon 1997) and surface insects (Witte and Winter, 1995). It is believed to spawn inshore (Wanink 1998) with an estimated fecundity of >1,000 eggs. Max. size: 9.0 cm SL (after Froese and Pauly 2003).
Systems:	Freshwater

Habitat and Ecology:

Lake-wide pelagic distribution both inshore and offshore (Van Ojien 1995). Mostly observed in the 0-20m depth range but eggs and fry may be found down to 68m (Graham1929, Wannink 1998). Juvenile fish migrate away from the shore after spending their larval stage in shallow waters (Wanink 1999). Adults stay near the bottom during the day and rise to the surface at night (Witte and Winter 1995). Feeds on zooplankton (Fermon 1997) and surface insects (Witte and Winter, 1995). It is believed to spawn inshore (Wanink 1998) with an estimated fecundity of >1,000 eggs. Max. size: 9.0 cm SL (after Froese and Pauly 2003).

Systems:

Freshwater

Threats [top]

Major Threat(s):	Fishery exploitation pressure is increasing, leading to reduction in size at first maturity (heavy fishing pressure). The pressure has been intensified by reduction in mesh size from 10 mm to 5 mm seines. Parasite infestation by a cestode Ligula intestenalis.

Major Threat(s):

Fishery exploitation pressure is increasing, leading to reduction in size at first maturity (heavy fishing pressure). The pressure has been intensified by reduction in mesh size from 10 mm to 5 mm seines. Parasite infestation by a cestode Ligula intestenalis.

Conservation Actions [top]

Conservation Actions:	No information available.

Conservation Actions:

No information available.

Citation:	Bayona, J.D.R. 2006. Rastrineobola argentea. In: IUCN 2008. 2008 IUCN Red List of Threatened Species. <www.iucnredlist.org>. Downloaded on 22 November 2008.
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