Scarlet goby

Rhinogobius zhoui

Also known as Zhou's scarlet goby, Zhou's goby, Vermilion goby

FreshwaterFish

Care at a glance

Temperature
61–75°F
16–24°C
pH
7.0–8.0
Adult size
1.6 in
4 cm
Minimum tank
12 gal
45 L
Temperament
Mostly peaceful
Social behavior
Solitary
Tankmates
With caution
Swim level
Bottom
Difficulty
Difficult
Breeding
Hard
Rarity
Rare
Family
Gobiidae
Origin
Native to the Lianhua Mountain area of Haifeng County in Guangdong Province, China, in shallow, fast-flowing, well-oxygenated headwater streams.

Overview

Keep it in a cool tank of 45 litres or more at 16 to 24 C with a pH of 7.0 to 8.0 and strong, oxygen rich flow. Males are territorial, so provide many rocky caves and either keep a single male or give a group enough broken sight lines in a larger tank. Do not house it with small ornamental shrimp, which it will hunt. Feed meaty foods such as frozen bloodworm, brine shrimp, small live foods and sinking carnivore pellets, since it ignores floating flake.

In the wild

The scarlet goby comes from cool, clear, fast-flowing mountain headwaters that are very high in oxygen. It is a bottom dweller that perches on and darts between smooth rocks. Recreate this with a cool tank, sand or fine gravel, plenty of smooth rockwork forming caves, strong flow and extra aeration. Pristine, well oxygenated water and frequent changes are essential, which makes it a fish for experienced keepers.

Good to know

Rhinogobius zhoui was described in 2008 and named after the collector who first brought it to attention. Males are boldly patterned in red and orange with spotted cheeks and defend small territories among the rocks. It is a cool water species best kept without a heater in most rooms.

Did you know

Because it needs cool, spotless, fast water, it usually does best in a dedicated hillstream style tank rather than a warm community aquarium.

Common questions

What size tank does a Scarlet goby need?

A Scarlet goby needs at least 12 gal (45 L). It spends most of its time in the bottom.

What temperature and pH does a Scarlet goby need?

A Scarlet goby is comfortable at 61–75°F (16–24°C) with a pH of 7.0–8.0.

How big does a Scarlet goby get?

An adult Scarlet goby reaches about 1.6 in (4 cm).

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