Overview

Comprehensive Description

Biology

A shy species (probably the most timorous pencil-fish species), living mainly on the surface and hidden, when possible, under a floating leaf or other hiding possibility. Swims actively, in a fitful manner, the moving of the pectorals is alternative, not symmetric. In captivity, accepts all foods, including dry ones, but only on the surface, neglecting what falls on the bottom. No peculiar nocturnal coloration; no direct courtship was yet observed, only short hunts against each other (within and between sexes) without real fights (Ref. 47610).
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Distribution

Mazaruni River basin, Guyana.
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South America: Mazaruni River, Guyana.
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Physical Description

Morphology

Dorsal spines (total): 2; Dorsal soft rays (total): 8; Analsoft rays: 9 - 10
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Size

Max. size

6.1 cm SL (male/unsexed; (Ref. 47610))
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Diagnostic Description

Elongated body (greatest depth 4.60-5.45 in SL) with a narrow caudal peduncle; symmetrical caudal fin and a dorsal fin far backward. Transverse scales from dorsal to pelvic, 6 or 6.5; predorsal scales 15.5 or 16. Mouth somewhat superior with a short maxilla (apparent length 4.5-5.5 in HL), not quite reaching the level of the eye's front margin. Eyes relatively large. A longitudinal black band surmounted by a light line, from opercle to base of middle caudal rays (Ref. 47610).
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Ecology

Habitat

Environment

pelagic; freshwater
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Conservation

Threats

Not Evaluated
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Wikipedia

Derhamia hoffmannorum

Derhamia hoffmannorum is a species of freshwater fish endemic to Guyana, where it is found in the Mazaruni River. It is the only species in its genus.[3] It is found in fresh water at pelagic depths [4]in a tropical climate.[5] The average length of an unsexed male is about 6.1 cm (2.4 in). It has an elongated body with large eyes. It is a timid species compared to other similar species such as the various pencilfish. They live near the surface of water and are known to hide whenever possible, usually under floating objects. This species only eats what can be found at the surface, as well. D. hoffmannorum will not seek food that sinks to the bottom. [6]

References[edit]

  1. ^ "Derhamia hoffmannorum Classification". Animal Diversity Web. Retrieved 1 April 2013. 
  2. ^ "Derhamia hoffmannorum Géry and Zarske, 2002". ITIS Standard Report. Retrieved 1 April 2013. 
  3. ^ Froese, Rainer and Pauly, Daniel, eds. (2011). "Derhamia hoffmannorum" in FishBase. October 2011 version.
  4. ^ "Derhamia hoffmannorum Géry & Zarske 2002". Fish Wise. Retrieved 1 April 2013. 
  5. ^ "Comprehensive Description Derhamia hoffmannorum". Encyclopedia of Life. Retrieved 1 April 2013. 
  6. ^ "Derhamia hoffmannorum Géry & Zarske, 2002". Fish Base. Retrieved 1 April 2013. 


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