Overview

Comprehensive Description

Biology

Forms schools (Ref. 35237). Found over mud or sandy mud bottoms near mouths of rivers. Juveniles are restricted to brackish and fresh waters. Feeds on shrimps and fishes. Important food fish (Ref. 3702).
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Distribution

Western Atlantic: Panama to Brazil.
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Western Atlantic: Panama to Argentina.
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Physical Description

Morphology

Dorsal spines (total): 11; Dorsal soft rays (total): 17 - 22; Analspines: 2; Analsoft rays: 7 - 9
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Size

Maximum size: 1090 mm TL
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Max. size

110 cm TL (male/unsexed; (Ref. 40637)); max. published weight: 17.0 kg (Ref. 40637)
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Diagnostic Description

Body nearly uniform silvery, dark greenish above. Without conspicuous spots on side but with diffuse dark areas along base of dorsal fin and on margin of spinous dorsal fin, ventral side of head, lower margin of pectoral, pelvic, and caudal fins often yellowish orange. Inside of opercle dusky. Mouth large, oblique. Lower jaw slightly projecting. Upper jaw with a pair of large canine-like teeth at tip. Lower jaw with a row of enlarged inner-row teeth, gradually increasing in size posteriorly. Chin without barbels or pores. Snout with 2 marginal pores. Pectoral fins about equal in length to pelvic fins. Gas bladder with a pair of long, straight, horn-like appendages. Sagitta earstone thin and elongate. Soft portion of dorsal fin unscaled except 2 or 3 rows of small scales along its base (Ref 51271).
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Type Information

Paratype for Cynoscion maracaiboensis
Catalog Number: USNM 121744
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Collector(s): L. Schultz
Year Collected: 1942
Locality: Venez: Lago Maracaibo 2 mi. Off Lagunillas, Venezuela, South America
  • Paratype:
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Paratype for Cynoscion maracaiboensis
Catalog Number: USNM 121743
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Collector(s): L. Schultz
Year Collected: 1942
Locality: Venez: Rio Agua Caliente 2 To 3 Kms. Above Lago Maracaibo, Venezuela, South America
  • Paratype:
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Holotype for Cynoscion maracaiboensis
Catalog Number: USNM 121742
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Preparation: Illustration
Collector(s): L. Schultz
Year Collected: 1942
Locality: Venez: Rio Agua Caliente 2 To 3 Kms. Above Lago Maracaibo, Venezuela, South America
  • Holotype:
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Ecology

Habitat

Depth range based on 5 specimens in 1 taxon.
Water temperature and chemistry ranges based on 1 sample.

Environmental ranges
  Depth range (m): 0.3 - 20
  Temperature range (°C): 26.753 - 26.753
  Nitrate (umol/L): 0.914 - 0.914
  Salinity (PPS): 35.759 - 35.759
  Oxygen (ml/l): 4.322 - 4.322
  Phosphate (umol/l): 0.204 - 0.204
  Silicate (umol/l): 4.162 - 4.162

Graphical representation

Depth range (m): 0.3 - 20
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.
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Depth: 0 - 20m.
Recorded at 20 meters.

Habitat: demersal.
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Environment

demersal; oceanodromous (Ref. 51243); freshwater; brackish; marine; depth range ? - 20 m (Ref. 3702)
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Depth range based on 5 specimens in 1 taxon.
Water temperature and chemistry ranges based on 1 sample.

Environmental ranges
  Depth range (m): 0.3 - 20
  Temperature range (°C): 26.753 - 26.753
  Nitrate (umol/L): 0.914 - 0.914
  Salinity (PPS): 35.759 - 35.759
  Oxygen (ml/l): 4.322 - 4.322
  Phosphate (umol/l): 0.204 - 0.204
  Silicate (umol/l): 4.162 - 4.162

Graphical representation

Depth range (m): 0.3 - 20
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Migration

Oceanodromous. Migrating within oceans typically between spawning and different feeding areas, as tunas do. Migrations should be cyclical and predictable and cover more than 100 km.
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Molecular Biology and Genetics

Molecular Biology

Barcode data: Cynoscion acoupa

The following is a representative barcode sequence, the centroid of all available sequences for this species.


No available public DNA sequences.

Download FASTA File
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Statistics of barcoding coverage: Cynoscion acoupa

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 1
Specimens with Barcodes: 4
Species With Barcodes: 1
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Conservation

Threats

Least Concern (LC)
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Relevance to Humans and Ecosystems

Benefits

Importance

fisheries: commercial; gamefish: yes; aquarium: commercial
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Wikipedia

Acoupa weakfish

Cynoscion acoupa, the acoupa weakfish, blacktail basher or grey snapper, is a croaker of the family Sciaenidae, found in the western Atlantic from Panama to Argentina, at depths down to 20 m. Its length is up to 1.1 m.

References[edit]

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