Syacium longidorsale — Details

Longfin Flounder learn more about names for this taxon

Overview

Comprehensive Description

Description

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Common names: flounder (English), lenguado (Espanol)
 
Syacium longidorsale Murakami & Amaoka, 1992


Pompadour flounder,     Long-fin flounder


Body height 42-48% of SL; head length 26-28% of SL; snout profile convex, at most a slight notch before top eye; snout longer than eye, length before top eye < 24% of head length; eyes on left side; eyes parallel; width between eyes < 6% of head length; mouth of moderate length, 31-37% of head length, ends under mid-eye; jaws on blind side not arched;  fixed teeth in 2 rows in upper jaw, 1 row lower jaw; 7-9 short, fat, serrated lower gill rakers; dorsal rays 82-92, 3rd-5th  rays long, ~ 30-50% of head length; 63-74 anal rays; eye-side pectoral 67-78% of head length (to 115% in male,  with 1st  ray elongate); base of eye side pelvic on midline of body; urinary papilla on blind side, immediately behind anus; lateral line not extending onto head, starts at corner of operculum, relatively straight; 50-57 lateral line scales; scales very rough in eye-side, smooth an blind side.

Eye side grey-brown, dorsal and anal with row of dark spots, pelvic a little darker, rear ½ of tail streaked; blind side yellow-white.

Size: 15 cm.

Habitat: sand and mud bottoms.

Depth: 10-40 m.

SE Gulf of California to Peru.

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Biology

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More information needed.
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Distribution

Range Description

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This species is endemic to the Eastern Pacific, and is found from the southeastern Gulf of California to northern Peru.
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Depth

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Depth Range (m): 10 (S) - 40 (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: 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: Ecuador. Also reported from Colombia (Ref. 10878).
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Physical Description

Morphology

Size

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Length max (cm): 15.0 (S)
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Size

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Maximum size: 150 mm TL
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Max. size

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15.0 cm TL (male/unsexed; (Ref. 9330))
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Type Information

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Paratype for Syacium longidorsale Murakami & Amaoka
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Preparation: Glycerin with Bone and Cartilage Stain
Collector(s): L. Knapp
Year Collected: 1966
Locality: Colombia, Pacific
Depth (m): 38 to 35
Vessel: Anton Bruun
  • Paratype: Murakami, T. & Amaoka, K. 1992. Bulletin of the Faculty of Fisheries, Hokkaido University. 43 (2): 82, 16,17.
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Paratype for Syacium longidorsale Murakami & Amaoka
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Collector(s): L. Knapp
Year Collected: 1966
Locality: Gulf Of Guayaquil, Ecuador, Pacific
Depth (m): 13 to 13
Vessel: Anton Bruun
  • Paratype: Murakami, T. & Amaoka, K. 1992. Bulletin of the Faculty of Fisheries, Hokkaido University. 43 (2): 82, 16,17.
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Holotype for Syacium longidorsale Murakami & Amaoka
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Collector(s): L. Knapp
Year Collected: 1966
Locality: Gulf Of Guayaquil, Ecuador, Pacific
Depth (m): 13 to 13
Vessel: Anton Bruun
  • Holotype: Murakami, T. & Amaoka, K. 1992. Bulletin of the Faculty of Fisheries, Hokkaido University. 43 (2): 82, 16,17.
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Ecology

Habitat

Habitat and Ecology

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Habitat and Ecology
This benthic species is found over soft sand and sandy mud bottoms in coastal areas to depths of 40m.

Systems
  • Marine
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Depth range based on 9 specimens in 1 taxon.

Environmental ranges
  Depth range (m): 13 - 49

Graphical representation

Depth range (m): 13 - 49
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.
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Depth: 13 - 38m.
From 13 to 38 meters.

Habitat: demersal. More information needed.
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Habitat

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Salinity: Marine, Marine Only

Inshore/Offshore: Inshore, Inshore Only

Water Column Position: Bottom, Bottom only

Habitat: Soft bottom (mud, sand,gravel, beach, estuary & mangrove), Soft bottom only, Sand & gravel

FishBase Habitat: Demersal
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Environment

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demersal; marine; depth range 13 - 38 m (Ref. 9330)
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Trophic Strategy

Feeding

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Feeding Group: Carnivore

Diet: mobile benthic crustacea (shrimps/crabs), 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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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
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, and is uncommon in at least part of its range. 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
There is no population information available for this species. This species is rarely seen in commercial trawls. It is often misidentified as S. ovale as it is very difficult to tell them apart, and only the males can be seperated by morphological traits.

Population Trend
Unknown
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Threats

Threats

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Major Threats
There are no major threats known to this species. It is sometimes caught as bycatch in shrimp trawling activities, but is too small a species to be kept for commercial purposes.
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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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