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Pollimyrus isidori (Valenciennes, 1847)

Elephant Fish
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Pollimyrus isidori
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Niger country information

Common names: [No common name]
Occurrence: native
Salinity: freshwater
Abundance: | Ref:
Importance: | Ref:
Aquaculture: | Ref:
Regulations: | Ref:
Uses: no uses
Comments:
National Checklist:
Country Information: https://www.cia.gov/library/publications/resources/the-world-factbook/geos/ng.html
National Fisheries Authority:
Occurrences: Occurrences Point map
Main Ref: Gosse, J.-P., 1984
National Database:

Common names from other countries

Classification / Names ຊື່ສາມັນ | ຄຳສັບຄ້າຍຄືກັນ | Catalog of Fishes(ຕະກຸນ, ຊະນິດ) | ITIS | CoL | WoRMS | Cloffa

> 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: Valenciennes.

Environment: milieu / climate zone / depth range / distribution range ນິເວດວິທະຍາ

; ນ້ຳຈືດ ອາໄສຢູ່ໃກ້ໜ້າດິນໃຕ້ພື້ນທ້ອງນ້ຳ; pH range: 6.0 - 8.0; dH range: 5 - 19; ກຸ່ມຫຼືຊະນິດປາທີ່ມີການເຄື່ອນຍ້າຍພາຍໃນນ້ຳຈືດ (Ref. 51243).   Tropical; 22°C - 24°C (Ref. 12468)

ການແຜ່ກະຈາຍ ປະເທດ | ເຂດ FAO | ລະບົບນິເວດ | ການປະກົດຕົວ | Point map | ການແນະນຳ | Faunafri

Africa: Senegal (Ref. 2915), Gambia, middle Niger (Ref. 3203) including the Benue (Ref. 2915), Volta and Chad basins, coastal rivers of Côte d'Ivoire (Sassandra, Bandama, Mé) and the Nile (Ref. 3203). Subspecies Pollimyrus isidori fasciaticeps and Pollimyrus isidori osborni are restricted to the Congo river basin (Ref. 3203).

Length at first maturity / ຂະໜາດ / ນ້ຳໜັກ / Age

Maturity: Lm 6.5  range ? - ? cm
Max length : 10.3 cm TL ຕົວຜູ້/ບໍ່ມີເພດ; (Ref. 57961); ນ້ຳໜັກສູງສຸດທີ່ເຄຍຈັດພີມມາ: 7.00 g (Ref. 3799)

Short description ຕົວທີ່ໃຊ້ໃນການຈຳແນກຊະນິດ | ສະລີລະວິທະຍາ | ການວັດແທກຮູບຮ່າງລັກສະນະພາຍນອກຂອງດິນ,ສັດ,ປາ…

ຄີ (ໜາມ)ແຂງຢູ່ຫຼັງປາ (ທັງໝົດ) : 0; ຄີຫຼັງຂອງປາ (ຄີອ່ອນ) (ທັງໝົດ) : 17 - 22; ຄີ(ໜາມ) ແຂງຢູ່ຄີກົ້ນປາ ກຸ່ມປາກະດູກແຂງ ຄວາມຖີ່ຂອງກຸ່ມຖ່າຍທອດພັນ ປາທີ່ມີການເຄື່ອນຍ້າຍຈາກທະເລໄປຫານ້ຳຈືດ ແລະນ້ຳຈືດຫາທະເລ ປາທີ່ມີການເຄື່ອນຍ້າຍຈາກທະເລແລະໄປໄຂ່ຢູ່ນ້ຳຈືດ ຄີກົ້ນຂອງປາ ສັດທີ່ມີກະດູກສັນຫັຼງ ການຖ່າຍທອດທາງກຳມະພັນຈາກພໍ່ແມ່ຫາລູກ: 0; ຄີກົ້ນຂອງປາ: 21 - 27. Body depth 2.8-4.2 x SL. Sokomo and Comoe forms longer with SL/Depth ratio 3-4. Head 3.8-5.0 x SL. Eye diameter 3.3-6.4 x head length. Dorsal origin slightly behind anal fin origin. Pectorals slightly shorter or equal to head length, 2-3 x longer than pelvic fins, its posterior end reaching past origin of pelvic fins. Caudal peduncle height 2.3-3.9 x of its length, 12.3-20.6 x SL. Middle reaches fish silvery in color with lots of small spots on sides and head, higher reaches fish darker with darker and fewer spots.

ຊີວະສາດ     ຄຳແປສັບ (ຕ.ຢ. epibenthic)

Occupies floodplain pools in Sudd. Feeds on mud, vegetable debris and small invertebrates (Ref. 28714). Affinities: only to P. adspersus, morphologically similar; distinguished through scales on caudal peduncle, dorsal and anal fin rays and body coloration. Generates electric organ discharge (EOD) of short duration (0.08 ms) that seems to correlate with aggregative behavior of the species (Ref. 10460; 10601). During the breeding season, males build nests and while patrolling their territory sporadically emit EODs at a mean rate of 18 Hz. Participating females, on the other hand, discharge at a fairly regular rate (8-11 Hz) and this has been shown to play a role in sex recognition during courtship and spawning. Male and female EOD waveforms also differ in the amplitude ratio of the first and third phase (Ref. 10764). Also produce natural sounds ('grunts', 'moans', 'growl', etc.) at different phases of courtship, nesting and territorial defense (Ref. 10832). A fractional spawner; females able to spawn up to 26 times in the course of one reproductive cycle, laying about 125 eggs per spawning episode. Larval electric organ situated in the deep lateral musculature; that of adults in the caudal peduncle (Ref. 10605).

Life cycle and mating behavior Maturities | ການສືບພັນ | Spawnings | Egg(s) | Fecundities | ຕົວອ່ອນ

30-200 eggs are spawned evey 5-8 days. Male builds nest and tends eggs and larvae. Eggs hatch after 4 days and feed after 12 days.

Main reference Upload your references | ເອກະສານອ້າງອີງ | ຜູ້ປະສານງານ | ຜູ້ຮ່ວມມື

Bigorne, R., 1990. Mormyridae. p. 122-184. In C. Lévêque, D. Paugy and G.G. Teugels (eds.) Faune des poissons d'eaux saumâtres d'Afrique de l'Ouest. tome 1. Faune Trop. 28. Musée Royal de l'Afrique Centrale, Tervuren, and ORSTOM, Paris. (Ref. 2915)

IUCN Red List Status (Ref. 130435)

  Least Concern (LC) ; Date assessed: 03 November 2019

CITES (Ref. 128078)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

  Harmless




Human uses

ການປະມົງ: ທີ່ບໍ່ມີຄວາມສົນໃຈ; ຕູ້ປາ: ເປັນສີນຄ້າ
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ຂໍ້ມູນຕື່ມອີກ

Trophic ecology
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ນິເວດວິທະຍາ
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Length-weight rel.
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Length-frequencies
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Estimates based on models

Phylogenetic diversity index (Ref. 82804):  PD50 = 0.5000   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01230 (0.00669 - 0.02263), b=2.80 (2.64 - 2.96), in cm Total Length, based on LWR estimates for this species & (Sub)family-body (Ref. 93245).
ຊັ້ນເຂດຮ້ອນ (Ref. 69278):  2.6   ±0.22 se; based on food items.
ຄວາມຢືດຢຸ່ນ (Ref. 120179):  ສູງ, ປະຊາກອນຕຳ່ສຸດທີ່ໃຊ້ເວລາສອງໜ້ອຍກວ່າ 15 ເດືອນ (tm=0.5).
Fishing Vulnerability (Ref. 59153):  Low vulnerability (10 of 100).