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🧬 Biological Classification (Kingdom to Species)Petromyzon marinus

Kingdom

Animalia

Phylum

Chordata

Class

Petromyzonti

Order

Petromyzontiformes

Family

Petromyzontidae

Genus

Petromyzon

Species

Petromyzon marinus

Petromyzonti🥩 Carnivore

Sea lamprey

Petromyzon marinus (Sea lamprey · ウミヤツメ)

🛡️ Conservation Status (IUCN Red List)LC (Least Concern)

DDData Deficient

LCLeast Concern

NTNear Threatened

VUVulnerable

ENEndangered

CRCritically End.

EWExtinct in Wild

EXExtinct

Geological Era

Extant

Diet

Carnivore

Length · Height

1.2m · No data

Mass · Top Speed

1~2.5kg · No data

Habitat & Fossil Locality

Coastal seas and rivers (when spawning) of the North Atlantic, as well as some freshwater lakes including the North American Great Lakes

💡 Everyday Comparisons for Size, Mass & Speed

💡 Its maximum length of 1.2 m is 20 cm longer than a 1 m ruler (Comparison).
💡 Its maximum weight of 2.5 kg is about 1/8 of a 20 kg bag of rice (Comparison).
💡 According to Animal Diversity Web, it is eaten as a delicacy in many foreign regions including parts of Asia and India.

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.

📊 Mass & Speed Index (0–100)

⚖️ Mass Index (Blue Whale ~190 t = 100, log scale)36

Site-computed relative index from recorded values; not a formal scientific metric.

#바다칠성장어#Petromyzon marinus

📖 1. Overview

The sea lamprey is the largest and most aggressive lamprey living along both coasts of the North Atlantic, growing in the sea and spawning in rivers. Some landlocked populations live permanently in freshwater lakes such as the Great Lakes.

🦴 2. Anatomy & Morphology

It lacks jaws and has an entirely cartilaginous skeleton, with a smooth, scaleless, elongated cylindrical body that is sometimes mistaken for an eel. It has 7 gill openings behind each eye, and its oval attachment mouth opens wider than its head.

🔍 3. Ecology & Behavior

Newly hatched larvae filter-feed on organic matter and algae in river bottoms before migrating to the sea (or the Great Lakes), where they live parasitically by attaching to fish and feeding on their blood and flesh. From April to June, a female lays 30,000–100,000 eggs, and adults stop feeding around spawning time.