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Pollimyrus nigricans, Dark stonebasher : fisheries
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Pollimyrus nigricans
Picture by
Denis Tweddle/SAIAB
Teleostei (teleosts) >
Osteoglossiformes
(Bony tongues) >
Mormyridae
(Elephantfishes)
Etymology:
Pollimyrus:
Because of Dr. Max Poll, ichthyologist + Greek, myros, -ou = the male of the morey eel
.
More on author:
Boulenger
.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Freshwater; demersal; potamodromous (Ref.
10608
). Tropical
Africa: Lakes Victoria, Nabugabo and Kyoga, and the Kiruni River (Semliki Valley) (Ref.
4903
), Malagarasi River (Ref.
54847
,
98755
), Rusizi River (Ref.
87863
,
98755
), Akagera system (Ref.
46152
) and Lake Tanganyika (Ref.
36899
).
Length at first maturity / Size / Weight / Age
Maturity: L
m
 
?
, range 5 - ? cm
Max length : 10.0 cm SL male/unsexed; (Ref.
4967
)
Favors the shallow mud bottom waters near fringing vegetation such as papyrus and
Vossia
(Ref.
9606
). Feeds on aquatic insects, mainly chironomid larvae (Ref.
12526
), on
Caridina
and caenid larvae (Ref.
9606
), but also on algae and plankton (Ref.
36900
). A male to female ratio of 1:10.5 has been noted for this species; it breeds continuously throughout the year with obvious peaks during the rains (Ref.
10608
). Anadromous (Ref.
10608
). Migrates up the rivers to spawn in temporary pools and streams (Ref.
4903
,
10608
). Oviparous (Ref.
205
).
Gosse, J.-P.
, 1984. Mormyridae. p. 63-122. In J. Daget, J.-P. Gosse and D.F.E. Thys van den Audenaerde (eds.) Check-list of the freshwater fishes of Africa (CLOFFA). ORSTOM, Paris and MRAC, Tervuren. Vol. 1. (Ref.
3203
)
IUCN Red List Status (Ref.
130435
)
Least Concern (LC)
; Date assessed:
21 December 2015
CITES
Not Evaluated
Not Evaluated
Threat to humans
Harmless
Human uses
Fisheries:
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Zoological Record
Estimates based on models
Phylogenetic diversity index (Ref.
82804
): PD
50
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01318 (0.00612 - 0.02839), b=2.85 (2.67 - 3.03), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245
).
Trophic level (Ref.
69278
): 3.4 ±0.50 se; based on food items.
Resilience (Ref.
120179
): Medium, minimum population doubling time 1.4 - 4.4 years (Fec = 206).
Fishing Vulnerability (Ref.
59153
): Low vulnerability (10 of 100).
Price category (Ref.
80766
):
Unknown
.
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Page last modified by :
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- 20 July 2016
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