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Diadromous Least Concern 🌡️ Tropical

Sperm goby

Ctenogobius thoropsis Pezold & Gilbert, 1987
Max Length
4.4 cm
Max Weight
-
Lifespan
-
Trophic Level
3.3
Depth
20–40 m
Climate
Tropical
Resilience
High
Vulnerability
11.00/100
Typical Length
-
Depth Zone
demersal

📖 Overview

Sperm goby (Ctenogobius thoropsis), first described by Pezold & Gilbert, 1987 is a tiny fish in the family Gobiidae (order Gobiiformes). Adults typically reach 4.40 cm in maximum length. It is diadromous, migrating between freshwater and marine environments during its life cycle. Recorded depth range: 20 to 40 metres. It occurs in Tropical waters. It feeds on a mix of small fish and invertebrates as a mid-level predator. On the IUCN Red List, it is classified as Least Concern.

Scientific Name
Ctenogobius thoropsis
Authority
Pezold & Gilbert, 1987
Habitat
Diadromous
Climate
Tropical
Body Shape
Fusiform / normal
IUCN Status
LC
Max Length
4.4 cm
Depth Range
20–40 m
Trophic Level
3.3
Resilience
High
Vulnerability
11.00/100
Migration
Amphidromous
Salinity
30–40 ppt

🐟 Physical Description

Dorsal spines (total): 7; Dorsal soft rays (total): 11; Anal spines: 1; Anal soft rays: 12. Eyes reduced, size do not fill the socket. Both sexes with jaw extending to the rear margin of the orbit. Pectoral fin count high (usually 18, 17-19). Tail elongated .: fusiform / normal.

🌀 Behaviour

Behavioural data for Sperm goby is currently being reviewed.

🦐 Diet

aquatic invertebrates
small fish
algae
detritus

🥚 Reproduction

🐣 Oviparous 📦 Batch Spawner
Spawning Season
spring
Spawn Location
Substrate
Fertilization
External

🌍 Habitat & Distribution

Marine; freshwater; brackish; demersal; amphidromous ; depth range 20 - 40 m . Tropical South America: Surinam and lower Rio Amazonas.

🌿 Ecology

Zone Preferences
🌊 Marine 💧 Freshwater 🌿 Brackish ⬇️ Benthic
Migration
Amphidromous
Trophic Level
3.3±0.4

📐 Morphometrics

Length–Weight Relationship: W = 0.01 × L3 (TL)
Max TL
4.4cm
Dorsal Spines
7
Dorsal Rays
11
Anal Spines
1
Anal Rays
12

🌡️ Water Parameters & Tolerance

Salinity Range
30–40ppt

🛡️ Conservation Assessment

IUCN Category
Least Concern
Assessment Date
2024

📊 Population Risk & Fisheries

Population Resilience
High
Minimum doubling time
Fishing Vulnerability
11.00/100
Low vulnerability
Trophic Level
3.3
Predator
Body Shape
Fusiform / normal
Climate Zone
Tropical
Described By
Pezold & Gilbert, 1987

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