TankBud

Lesser spiny eel

Macrognathus aculeatus

Also known as Eye Spot Spiny Eel

FreshwaterFish

Lesser spiny eel (Macrognathus aculeatus)

Care at a glance

Temperature
73–82°F
23–28°C
pH
6.0–7.5
Adult size
15 in
38 cm
Minimum tank
85 gal
320 L
Temperament
Mostly peaceful
Social behavior
Solitary
Tankmates
With caution
Swim level
Bottom
Difficulty
Medium
Breeding
No record
Rarity
Very rare
Family
Mastacembelidae
Origin
Thailand, Laos, Cambodia, Vietnam

Overview

The lesser spiny eel is a night-active burrower that hides in soft sand by day and comes out after dark to hunt along the bottom. It needs a deep bed of fine sand it can bury into, as coarse gravel damages its delicate skin. Though generally peaceful, it will eat small fish and shrimp it can swallow, so give it larger, calm tankmates. Keep it singly, feeding live and frozen foods such as earthworms, bloodworms, and shrimp in the evening. It is a determined escape artist, so seal the lid. This eel grows fairly large and needs a tank of at least 320 liters.

In the wild

Macrognathus aculeatus comes from Southeast Asia, in the slow rivers, lakes, and flooded lowlands of Thailand, Laos, Cambodia, and Vietnam, where soft substrate and submerged cover are common. Recreate its home with a deep, soft sand bed, driftwood and plants for shelter, and gentle, well-filtered flow. Keep the temperature between 23 and 28 degrees Celsius and the pH slightly acidic to neutral, from about 6 to 7.5.

Good to know

The lesser spiny eel belongs to Mastacembelidae, the spiny eel family, and reaches around 38 centimeters. Its long, snake-like body carries a row of short, sharp spines in front of the soft dorsal fin, which give the family its name, and it ends in a small, pointed, trunk-like snout. Spiny eels are not true eels but bony fish with a very elongated shape. Breeding is rarely recorded in home aquariums.

Did you know

Despite the name, the lesser spiny eel is not a true eel at all. It is a bony fish with a stretched-out body and a row of short defensive spines along its back, set just ahead of the soft fin.

Common questions

What size tank does a Lesser spiny eel need?

A Lesser spiny eel needs at least 85 gal (320 L). It spends most of its time in the bottom.

What temperature and pH does a Lesser spiny eel need?

A Lesser spiny eel is comfortable at 73–82°F (23–28°C) with a pH of 6.0–7.5.

How big does a Lesser spiny eel get?

An adult Lesser spiny eel reaches about 15 in (38 cm).

Related species