Microthrissa minuta Poll, 1974
Dungu sprat
photo by FAO

Family:  Clupeidae (Herrings, shads, sardines, menhadens), subfamily: Dorosomatinae
Max. size:  3.5 cm SL (male/unsexed)
Environment:  pelagic,
Distribution:  Africa: Congo River system in Dungu River and its tributary Garamba River (Ref. 188), and Lower Congo River (Ref. 188) in Democratic Republic of Congo (Ref. 47399). Also reported as Microthrissa cf. minuta from mouth of Niemba River, Lukuga River, an outflow of Lake Tanganyika (Ref. 93587).
Diagnosis:  Dorsal spines (total): 0-0; Dorsal soft rays (total): 12-15; Anal spines: 0-0; Anal soft rays: 18-21; Vertebrae: 40-44. Diagnosis: Body moderately deep, its depth about 22-30% of standard length; scutes strongly keeled, 1 or 2 before base of first pectoral finray, 11-12 + 8; snout pointed; lower jaw not projecting, included in upper when mouth closed, with small teeth at symphysis; maxilla blade slender, more than 3 times as long as deep, upper edge with a ridge flared outward; second supra-maxilla small, shaft as long as spatulate blade; lower gillrakers 18-22; total anal finrays 18-21; scales in lateral series 37-40 (Ref. 188, 47399). It resembles Microthrissa royauxi, which has fewer gillrakers but more anal finrays, 14-16 and 23-27 respectively (Ref. 188). Description: Body depth 21.7-30.0% of standard length; head length 11.1-12.7% of standard length (Ref. 188, 93833). Premaxilla with 12-30 conical teeth directed inwards; 11-25 little conical teeth on maxillary (Ref. 47399). Dorsal fin origin closer to snout than caudal fin base, inserted behind pelvic fin base; dorsal fin with 12-15 fin rays; anal fin with 18-21 fin rays; ventral fin with 1 unbranched and 6 branched rays; pectoral fin with 10-13 fin rays (Ref. 47399, 93833). Cycloid scales; 37-43 on longitudinal line (Ref. 47399). First gill arch with 18-22 gillrakers on lower limb, 27-32 total gillrakers (Ref. 47399). Scutes present: 1-2 prepectoral scutes without ascending arms, 10 prepelvic scutes with ascending arms, 1 subpelvic scute without ascending arms, 7 postpelvic scutes with ascending arms; strongly keeled (Ref. 93833). Vertebrae 40-44 (Ref. 47399). Colouration: Silvery, occiput blackish and contrasting; a weak pigmented trace on caudal peduncle ending in a small black spot at base of lower lobe of caudal fin (Ref. 47399, 93833).
Biology:  A riverine species (Ref. 188).
IUCN Red List Status: Vulnerable (VU); Date assessed: 16 February 2009 (D2) Ref. (120744)
Threat to humans:  harmless
Country info:   
 

Entered by: Binohlan, Crispina B. - 17.10.90
Modified by: Boden, Gert - 24.07.18
Checked by: Binohlan, Crispina B. - 23.07.94

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