🪐 View in 3D Galaxy 📏 View on 3D Scale Stage

🧬 Biological Classification (Kingdom to Species)Gobiobotia naktongensis

Kingdom

Animalia

Phylum

Chordata

Class

Actinopteri

Order

Cypriniformes

Family

Gobionidae

Genus

Gobiobotia

Species

Gobiobotia naktongensis

📏 True-scale comparison (1 m = 1 m) against a 1.75 m humanLength 8cm

🔍 Zoomed View — Same scale as a credit card & 2.65cm coin

· Grid units represent actual meters (m); human and animals are drawn to the exact same scale with original silhouette aspect ratios preserved.
· When a size range is recorded (e.g. 1–1.6m), the lower bound is used for scale comparison.
· Nakdong gudgeon silhouette: PhyloPic — Douglas Teles da Rosa · CC0 1.0 (Tanichthys albonubes)
· Human silhouette: PhyloPic — NASA · Public Domain Mark 1.0

• Length vs. 1.75 m human: 0.05× Compare with other species →

Actinopteri🥩 Carnivore

Nakdong gudgeon

Gobiobotia naktongensis (Nakdong gudgeon · Nakdong gudgeon)

🛡️ Conservation Status (IUCN Red List)CR (Critically Endangered)

DDData Deficient

LCLeast Concern

NTNear Threatened

VUVulnerable

ENEndangered

CRCritically End.

EWExtinct in Wild

EXExtinct

🇰🇷 Class I endangered wildlife (Korea)

Geological Era

Extant

Diet

Carnivore

Length · Height

8cm · No data

Mass · Top Speed

No data · No data

Habitat & Fossil Locality

Shallow, slow-moving sandy river bottoms (Gamcheon survey: depth of about 11–69 cm)

💡 Everyday Comparisons for Size, Mass & Speed

💡 Its body length of 8 cm is slightly shorter than the long side of a credit card (about 8.56 cm) (Comparison).
💡 When sandy river bottoms are altered by construction, this fish loses its home, making river-maintenance news a story about this species as well.

Reference standards: coach bus ~12 m, mid-size car ~4.9 m, compact car ~1 t, basketball hoop 3.05 m, credit card 8.56 cm.

#흰수마자#Gobiobotia naktongensis

📖 1. Overview

The Nakdong gudgeon is a small freshwater fish found only in Korea, living on sandy bottoms of slow, shallow rivers.

🦴 2. Anatomy & Morphology

Its body is slender and elongated, and its dorsal fin consists of 3 spines and 7 soft rays.

🔍 3. Ecology & Behavior

It mainly feeds on midge larvae and spawns in June and July when water temperatures are 28–31 °C, carrying about 1,000–7,000 eggs at a time.

🇰🇷 4. Connection to Korea

It is a Class I endangered wildlife (Korea) species and an endemic of the Korean Peninsula, living in the Nakdonggang, Geumgang, Hangang, and Imjingang river systems. Research papers report that its population has declined sharply due to major river construction.