Isopisthus remifer — Details

Silver Weakfish learn more about names for this taxon

Overview

Comprehensive Description

Description

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Common names: corvina (English), weakfish (English), corvina (Espanol)
 
Isopisthus remifer Jordan & Gilbert, 1882


Bigeye corvina,     Silver weakfish



Body elongate, very compressed; eye large; mouth oblique, lower jaw strongly projecting; chin without barbells and pores; tip of top jaw with a pair of large, curved canine teeth; 7-10 lower gill rakers; preopercle weakly serrated; dorsal fin divided in two well separated parts, VII-IX+I-II, 21-23; anal fin with II short spines, base long, about equal to that of base of soft dorsal, 17-19 soft rays; pectoral fins long, reaching beyond tips of depressed pelvic fins; caudal fin bluntly pointed to straight; scales smooth; soft dorsal and anal fins entirely scaled; pored lateral-line scales 52-57.

Silver, bluish grey on upper back; tip of lower jaw and opercular lining black; pectoral axil dark; fins pale to yellowish.


Size: to 35 cm.

Inhabits coastal waters and lower parts of estuaries.

Depth: 4-50 m.

Southern Baja California, and the eastern Gulf of California to Chile.

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Biology

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Inhabits coastal waters and lower estuarine regions (Ref. 9118). Feeds on fishes, shrimps and cephalopods (Ref. 9118).
  • Chao, L.N. 1995 Sciaenidae. Corvinas, barbiches, bombaches, corvinatas, corvinetas, corvinillas, lambes, pescadillas, roncachos, verrugatos. p. 1427-1518. In W. Fischer, F. Krupp, W. Schneider, C. Sommer, K.E. Carpenter and V. Niem (eds.) Guia FAO para identificacion de especies para los fines de la pesca. Pacifico Centro-oriental. 3 volumes. 1813 p. (Ref. 9118)   http://www.fishbase.org/references/FBRefSummary.php?id=9118&speccode=13985 External link.
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Distribution

Range Description

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This species is endemic to the Eastern Pacific, and is found from central Baja California (Bahia Tortugas), and the entire eastern Gulf of California to Peru.
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Depth

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Depth Range (m): 4 (S) - 50 (S)
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Zoogeography

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See Map (including site records) of Distribution in the Tropical Eastern Pacific


 
Global Endemism: All species, East Pacific endemic, Tropical Eastern Pacific (TEP) endemic

Regional Endemism: All species, TEP endemic, Continental TEP endemic, 3 provinces (Cortez + Mexican + Panamic) endemic, Continent, Continent only

Residency: Resident

Climate Zone: North Temperate (Californian Province &/or Northern Gulf of California), Northern Subtropical (Cortez Province + Sinaloan Gap), Northern Tropical (Mexican Province to Nicaragua + Revillagigedos), Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo), South Temperate (Peruvian Province )

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Eastern Pacific: Gulf of California and southern Baja California, Mexico to Peru.
  • Chao, L.N. 1995 Sciaenidae. Corvinas, barbiches, bombaches, corvinatas, corvinetas, corvinillas, lambes, pescadillas, roncachos, verrugatos. p. 1427-1518. In W. Fischer, F. Krupp, W. Schneider, C. Sommer, K.E. Carpenter and V. Niem (eds.) Guia FAO para identificacion de especies para los fines de la pesca. Pacifico Centro-oriental. 3 volumes. 1813 p. (Ref. 9118)   http://www.fishbase.org/references/FBRefSummary.php?id=9118&speccode=13985 External link.
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Physical Description

Morphology

Size

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Length max (cm): 35.0 (S)
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Size

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Maximum size: 350 mm TL
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Max. size

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36.0 cm TL (male/unsexed; (Ref. 55763))
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Type Information

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Type for Isopisthus remifer
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Collector(s): C. Gilbert
Locality: Panama, Pacific
  • Type:
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Type for Isopisthus remifer
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Collector(s): C. Gilbert
Locality: Panama, Pacific
  • Type:
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Type for Isopisthus remifer
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Collector(s): C. Gilbert
Locality: Panama, Pacific
  • Type:
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Type for Isopisthus remifer
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Collector(s): C. Gilbert
Locality: Panama, Pacific
  • Type:
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Type for Isopisthus remifer
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Collector(s): C. Gilbert
Locality: Panama, Pacific
  • Type:
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Ecology

Habitat

Habitat and Ecology

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Habitat and Ecology
This benthopelagic species inhabits coastal waters and lower estuarine regions to depths of 50m. According to Cooke (1992), I. remifer (cited as Isophistus altipinnis) regularly occurs in middle estuaries and mangroves, and is occasionally found in bar-formed lagoons in Peru and Costa Rica. It feeds on fishes, shrimps and cephalopods.

Systems
  • Marine
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Depth range based on 17 specimens in 1 taxon.

Environmental ranges
  Depth range (m): 3 - 281.5

Graphical representation

Depth range (m): 3 - 281.5
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.
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Habitat

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Salinity: Brackish, Non Marine

Inshore/Offshore: Inshore, Inshore Only

Water Column Position: Mid Water, Near Bottom, Bottom, Bottom + water column

Habitat: Soft bottom (mud, sand,gravel, beach, estuary & mangrove), Mud, Sand & gravel, Estuary, Water column

FishBase Habitat: Bentho-Pelagic
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Environment

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benthopelagic; brackish; marine
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Trophic Strategy

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Inhabits coastal waters and lower estuarine regions. Feeds on fishes, shrimps and cephalopods.
  • Chao, L.N. 1995 Sciaenidae. Corvinas, barbiches, bombaches, corvinatas, corvinetas, corvinillas, lambes, pescadillas, roncachos, verrugatos. p. 1427-1518. In W. Fischer, F. Krupp, W. Schneider, C. Sommer, K.E. Carpenter and V. Niem (eds.) Guia FAO para identificacion de especies para los fines de la pesca. Pacifico Centro-oriental. 3 volumes. 1813 p. (Ref. 9118)   http://www.fishbase.org/references/FBRefSummary.php?id=9118&speccode=13985 External link.
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Feeding

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Feeding Group: Carnivore

Diet: mobile benthic crustacea (shrimps/crabs), octopus/squid/cuttlefish, bony fishes
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Life History and Behavior

Reproduction

Reproduction

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Egg Type: Pelagic, Pelagic larva
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Isopisthus remifer

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Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Species: 2
Species With Barcodes: 1

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Statistics of barcoding coverage: Isopisthus altipinnis

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Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Species: 2
Species With Barcodes: 1

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Conservation

Conservation Status

IUCN Red List Assessment

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Red List Category
LC
Least Concern

Red List Criteria

Version
3.1

Year Assessed
2010

Assessor/s
Chao, L., Espinosa, H., Findley, L., van der Heiden, A.

Reviewer/s
Carpenter, K., Polidoro, B., Livingstone, S. (Global Marine Species Assessment Team)

Justification
This species is widespread in the Eastern Pacific. There are no major threats for this species, and no current indication of population decline. It is listed as Least Concern.
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Conservation status

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IUCN Red List: Not evaluated / Listed

CITES: Not listed
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Population

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Population
No population information is available for this species.

Population Trend
Unknown
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Threats

Threats

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Major Threats
There are no major threats known for this species.
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Least Concern (LC)
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Management

Conservation Actions

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Conservation Actions
There are no known conservation measures for this species. However, this species distribution falls partially into a number of Marine Protected Areas in the Eastern Pacific region (WDPA 2006).
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Relevance to Humans and Ecosystems

Benefits

Importance

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fisheries: minor commercial
  • Chao, L.N. 1995 Sciaenidae. Corvinas, barbiches, bombaches, corvinatas, corvinetas, corvinillas, lambes, pescadillas, roncachos, verrugatos. p. 1427-1518. In W. Fischer, F. Krupp, W. Schneider, C. Sommer, K.E. Carpenter and V. Niem (eds.) Guia FAO para identificacion de especies para los fines de la pesca. Pacifico Centro-oriental. 3 volumes. 1813 p. (Ref. 9118)   http://www.fishbase.org/references/FBRefSummary.php?id=9118&speccode=13985 External link.
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