Sierrathrissa leonensis Thys van den Audenaerde 1969

Diagnosis: Small, slender fishes, easily mistaken for the juveniles of Pellonula (Ref. 188). Belly rounded, with 0-10 minute pre-pelvic scutes, without arms, supporting a low membranous keel, post-pelvic scutes similar, the keel more apparent, and a W-shaped scute located at the pelvic fin bases; lower gillrakers 13-16; pelvic insertion well before dorsal fin, with 1 unbranched and 5-6 branched rays; anal fin beginning under dorsal fin base (Ref. 188, 2849, 81269, 81631, 120915, 121309). It commmonly occurs with Pellonula, which has pelvic fins with 1 unbranched and 7 branched rays, normal scutes and the pelvic fin insertion more or less below the dorsal fin origin (Ref. 188).Description: Body elongate, its greatest depth 10-22% of standard length; body-section eliptic; belly not keeled (Ref. 120915, 121309). Head elongate, its length 18-25% of standard length; eyes large, the eye diameter 25-35% of head length; snout shorter, nearly rounded, its length about 20% of head length; jaws subequal or lower very slightly projecting (Ref. 121309). Pre-maxilla with a single series of small pointed teeth; 8-9 teeth on either pre-maxilla; maxilla long and narrow, with on lower half 12-13 teeth similar to those on maxilla; a single supra-maxilla; hind edge of supra-maxilla and maxilla equal and reaching till middle between nostril and eye or a little beyond; a series of 6 small teeth on either side of the dentary symphysis; no teeth observed on the tongue nor on the palate or vomer (Ref. 121309). Operculum with an excavation on posterior side; posterior fontanelles present in adults, in length about aqual to eye-diameter (Ref. 121309). First gill arch with 13-16 gillrakers on lower limb (Ref. 188, 2849, 81269, 81631). Dorsal fin placed distinctly behind the level of pelvic-fin insertions, and closer to caudal-fin base than to snout-tip; dorsal fin with 12-15 rays, longest dorsal ray about 15% of standard length, and as long or a little longer than fin base, when folded down the longest ray reaches till same level as posterior dorsal ray; anal fin with 16-20 rays, anal fin origin nearer to pelvic fin base than to caudal fin base; pectoral fin with 8-10 rays, pectoral fin base just below posterior opercular border, pectoral fin tip reaching midway between finbase and pelvic fins insertion; pelvic fins with 6-7 rays, originating nearly at midbody, ventral tip not reaching anus; caudal fin a little shorter than head, with 17-22 rays (Ref. 2849, 81269, 81631, 120915, 121309). Scales cycloid; approximately 37-38 scales in longitudinal line; scales hardly visible on posterior half of body in largest specimens (Ref. 81269, 93833, 121309). Non-keeled pre-pelvic and post-pelvic scutes, both lacking ascending arms, except for the W-shaped scute located at the pelvic-fin bases; 0-10 pre-pelvic and 6-11 post-pelvic mid-ventral scutes (Ref. 188, 2849, 81269, 81631). Total vertebrae 36-41 (Ref. 120915, 121309). In the caudal fin skeleton the first ural centrum is not fused with the pleural centrum (Ref. 2849, 81269, 81631). Branchiostegal rays 3; predorsal bones 12-13, in a row from occiput, row not reaching dorsal fin origin (Ref. 121309). Colouration: In alcohol-preserved specimens, body pale brown with a lighter lateral stripe; small melanophores present on snout, upper parts of head, opercles and caudal-fin base; a double band of melanophores in the predorsal area and another at anal-fin base; fins colourless (Ref. 2849, 81269, 81631, 121309). Live specimens are golden-beige with a lateral stripe of melanophores; iris is silvery (Ref. 2849, 81269, 81631).

Dorsal spines (total): 0; Dorsal soft rays (total): 12 - 15; Analspines: 0; Analsoft rays: 16 - 20; Vertebrae: 36 - 41

A riverine species, but also in man-made lakes (Ref. 188). Schooling in open waters and at about 2 to 8 m in Lake Kainji, rising to about 30 cm from the surface at night in Lake Volta (Ref. 188, 3034). It feeds on plankton, especially cladocerans and rotifers (Ref. 188, 120915).

A riverine species, but also in man-made lakes (Ref. 188). Schooling in open waters and at about 2 to 8 m in Lake Kainji, rising to about 30 cm from the surface at night in Lake Volta (Ref. 188, 3034). It feeds on plankton, especially cladocerans and rotifers (Ref. 188, 120915). It breeds at about 1.8-2.0 cm standard length (Ref. 188).

fisheries: commercial

Sierrathrissa leonensis és una espècie de peix pertanyent a la família dels clupèids i l'única del gènere Sierrathrissa.

The West African pygmy herring (Sierrathrissa leonensis) is a very small fish, reaching a maximum length of 3 centimetres (1.2 in) SL. It is a member of the herring family Dorosomatidae in the freshwater systems of western and central Africa that includes such species as the Microthrissa royauxi of the Congo River basin and Limnothrissa miodon of Lake Tanganyika. It is the only species of its genus.

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Sierrathrissa leonensis Sierrathrissa generoko animalia da. Arrainen barruko Clupeidae familian sailkatzen da.

西拉棱鯡為輻鰭魚綱鲱形目鲱科的其中一種，分布於非洲塞內加爾至喀麥隆的淡水流域，體長可達3公分，棲息在溪流、湖泊，成群活動，以橈腳類、甲殼類等為食，可做為食用魚。