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🌊 Marine Data Deficient 🌡️ Deep-water

Paraphyonus Rassi

Paraphyonus rassi Nielsen, 1975
Max Length
10.3 cm
Max Weight
Lifespan
Trophic Level
3.4
Depth
2610–4440 m
Climate
Deep-water
Resilience
High
Vulnerability
22.00/100
Typical Length
Depth Zone
deep-water

📖 Overview

A rare species . Viviparous . All four male specimens with developed reproductive organ indicating internal fertilization, and a tentatively referred specimen is a female with distended, 15 mm long ovaries containing large eggs (0.7 mm) . A ripe female with eggs (ca. 1 mm diameter), caught in Hunter Commonwealth Marine Reserve, NSW, is the largest known specimen .

Scientific Name
Paraphyonus rassi
Authority
Nielsen, 1975
Habitat
Marine
Climate
Deep-water
IUCN Status
DD
Max Length
10.3 cm
Depth Range
2610–4440 m
Trophic Level
3.4
Resilience
High
Vulnerability
22.00/100
Salinity
30–40 ppt

🔬 Taxonomy

Genus
Paraphyonus
Paraphyonus
Species
Paraphyonus Rassi
Paraphyonus rassi

🐟 Physical Description

Dorsal soft rays (total): 75 - 81; Anal soft rays: 53 - 56; Vertebrae: 68 - 71. This species is distinguished from is congeners by the following characters: first gill arch with 3-4 developed gill rakers; D 75-81; precaudal vertebrae 31-32; anal fin origin below vertebrae 32-36. Colouration: black pigmentation laterally in the roof of the mouth, very distinct from the outside as a black area half the head length between the eye and the upper jaw .Cross section: compressed.

🌀 Behaviour

Behavioural data for Paraphyonus Rassi is currently being reviewed.

🦐 Diet

Diet information for Paraphyonus Rassi is currently being compiled.

🥚 Reproduction

Reproduction data for Paraphyonus Rassi is currently being compiled.

🌍 Habitat & Distribution

Marine; bathydemersal; depth range 2610 - 4440 m . Deep-water West and East Central Atlantic: Sargasso Sea and the Caribbean Sea.

🌿 Ecology

Zone Preferences
🌊 Marine 🌑 Deep Water
Trophic Level
3.4±0.5

📐 Morphometrics

Length–Weight Relationship: W = 0.00468 × L3.03 (TL)
Max TL
10.3cm
Dorsal Rays
78
Anal Rays
55
Vertebrae
70

🌡️ Water Parameters & Tolerance

Salinity Range
30–40ppt

🛡️ Conservation Assessment

IUCN Category
Data Deficient
Assessment Date
2014

📊 Population Risk & Fisheries

Population Resilience
High
Minimum doubling time
Fishing Vulnerability
22.00/100
Low vulnerability
Trophic Level
3.4
Predator
Climate Zone
Deep-water
Described By
Nielsen, 1975

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