Overview

Comprehensive Description

Description

  Common names: serrano (English), guaseta (Espanol)
 
Serranus stilbostigma (Jordan & Bollmann, 1890)

Side-blotch serrano

Body elongate, moderately compressed; snout sharp, profile from tip of snout to dorsal origin straight; lower jaw strongly projecting; mouth reaches to under middle of eye, large (25% of head length); space between eyes convex, ridged; preopercle regularly serrated, no spur with enlarged spines; 9 lower gill rakers; dorsal X, 12, both sections low; anal III, 7, 2nd  spine strongest, ~ same length as 3rd; pelvics inserted before pectoral base; tail concave, upper tip longer; pectorals reach to anus; scales rough, relatively large, 11 rows on cheek, 58 lateral line scales.



Head and body red, breast orange; a few small pale spots on cheek and opercle; front of back with indistinct dark and light speckles; a square black spot on body below front of soft dorsal fin, from lateral line to bases of several rays;  behind this 3 smaller black spots on top of back and dorsal base; a row of ~ 10 black spots along mid-flank under soft dorsal to tail base, with faint irregular dark spots below this row; a large oblique cream bar extends from midbelly (at level of pelvic tip) to lateral line; spiny dorsal with 3 rows dark spots separated by pale streaks, soft dorsal with several basal dark spots, and a pale medial stripe above; upper ½ of tail red, with a few small black spots, lower ½ black; outer half of anal and pelvics dark; pectoral pale.

        Size: 14.5 cm.

Habitat: rocky bottom.

        
        Depth: 80-200 m.

        Galapagos and Ecuador.
   
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Distribution

Range Description

This species is appears to be endemic to the Galapagos, although there are some records from coastal Ecuador. This species distribution is not well known, given that it is only known from a few deep water specimens.
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Zoogeography

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, TEP oceanic island (s) endemic, Galapagos Islands endemic, Island (s), Island (s) only

Residency: Resident

Climate Zone: Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
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Southeast Pacific: Ecuador.
  • Eschmeyer, W.N. (ed.) 2001 Catalog of fishes. Updated database version of December 2001. Catalog databases as made available to FishBase in December 2001. (Ref. 40966)
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Galápagos Islands.
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Depth

Depth Range (m): 80 (S) - 200 (S)
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Physical Description

Morphology

Size

Length max (cm): 14.5 (S)
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Type Information

Type for Prionodes stilbostigma
Catalog Number: USNM 44278
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Year Collected: 1888
Locality: Galapagos Islands, Pacific
Depth (m): 82 to 82
Vessel: Albatross
  • Type:
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
It reef-associated species is found on rocky substrata from 80-200m depth. It feeds on mobile benthic crustaceans, octupus, squid, cuttlefishes, and bony fishes.

Systems
  • Marine
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Environment

reef-associated; marine; depth range 82 - 82 m (Ref. 58018)
  • Bogutskaya, N.G. 2007 Preliminary assignment of coordinates to type localities in the Catalog of Fishes. Unpublished dbf file. (Ref. 58018)
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Depth range based on 1 specimen in 1 taxon.
Water temperature and chemistry ranges based on 1 sample.

Environmental ranges
  Depth range (m): 82 - 82
  Temperature range (°C): 16.327 - 16.327
  Nitrate (umol/L): 20.312 - 20.312
  Salinity (PPS): 35.024 - 35.024
  Oxygen (ml/l): 2.342 - 2.342
  Phosphate (umol/l): 1.625 - 1.625
  Silicate (umol/l): 15.955 - 15.955
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Salinity: Marine, Marine Only

Inshore/Offshore: Inshore, Inshore Only

Water Column Position: Bottom, Bottom only

Habitat: Reef (rock &/or coral), Reef only, Rocks, Reef associated (reef + edges-water column & soft bottom)

FishBase Habitat: Reef Associated
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Trophic Strategy

Feeding

Feeding Group: Carnivore

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

Reproduction

Egg Type: Pelagic, Pelagic larva
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
LC
Least Concern

Red List Criteria

Version
3.1

Year Assessed
2010

Assessor/s
Smith-Vaniz, B, Robertson, R., Dominici-Arosemena, A., Molina, H., Salas, E. & Guzman-Mora, A.G.

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

Contributor/s

Justification
This deep-water species is restricted to the Galápagos islands, and possibly coastal Ecuador. The majority of its range lies entirely within a Marine Protected Area, and it is unlikely to be affected by ENSO events due to its deep-water habitat.Therefore, there are no major threats known to this species, and no indication of widespread population decline. It is listed as Least Concern. However, more research is needed on this species distribution, population status, habitat requirements, and major threats.
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IUCN Red List: Not evaluated / Listed

CITES: Not listed
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Population

Population
There is no population information available for this species.

Population Trend
Unknown
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Threats

Major Threats
There are no major threats known to this species. It is restricted to a small part of the Eastern Pacific that is most strongly affected by ENSO, but because it is a deepwater species, it is not likely to be affected by these events.
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Least Concern (LC)
  • IUCN 2006 2006 IUCN red list of threatened species. www.iucnredlist.org. Downloaded July 2006.
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Management

Conservation Actions

Conservation Actions
There are no species specific conservation measures. The majority of this species' range lies within the Galapagos Island Marine Protected Area. However, this species is not well-known, and more information is needed on its distribution, population status, habitat requirements, life history and major threats.
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