Potamorrhaphis Guianensis

📖 Overview

Forms schools at the surface. Prefers to inhabit marshes, small slow-moving creeks or even in main river beds, in the slowest parts of meandering streams next to banks . Voracious carnivore which appears to have a primarily nocturnal habit . During reproduction, the male positions itself beside the female or crosswise in front of her. Sometimes the male touches the female with his side, pushing her aside in an oblique position, with their heads oriented downwards. The couple settles next to a bush where the female spawns her eggs (15 to 40). Eggs adhere to plants by means of sticky filaments which are 2 to 3 mm long. At 27-30°C, incubation lasts for 9 to 10 days. Larvae are pelagic and carnivorous . Maximum length 40 cm TL in Keith et al., 2000 .

🔬 Taxonomy

🐟 Physical Description

Dorsal spines (total): 0; Dorsal soft rays (total): 29 - 36; Anal spines: 0; Anal soft rays: 25 - 32; Vertebrae: 68 - 78. Predorsal scales 85-135, mean 110.3.: elongated.

🌀 Behaviour

Behavioural data for Potamorrhaphis Guianensis is currently being reviewed.

🦐 Diet

🥚 Reproduction

The eggs are attached to underwater vegetation. At 27-30 deg. Celsius the larvae hatch after 9 - 10 days. The larvae are pelagic carnivores.

🌍 Habitat & Distribution

Freshwater; pelagic; depth range 0 - ? m. Tropical; 23°C - 26°C South America: Amazon and Orinoco River basins, and the Guianas.

🌿 Ecology

📐 Morphometrics

🌡️ Water Parameters & Tolerance

🛡️ Conservation Assessment

📊 Population Risk & Fisheries

🌐 Names & Taxonomy

Scientific Synonyms

🐠 Related Species

🔍 Similar Species

🗺️ Global Occurrence Map

Occurrence records from the Global Biodiversity Information Facility (GBIF) - 51 records indexed .

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