Eurasian Minnow Care Guide - Aquarium Setup, Diet & Breeding

The Eurasian Minnow is a small, lively member of the carp family with a slender body, rounded fins and a subtly upturned mouth. Its colouring varies with habitat and mood, but it commonly shows a greenish, olive or brown back, silvery flanks and a dark lateral stripe or mottled pattern. During the breeding season, males can become much more strongly coloured, with reddish tones on the underside and fins.

These minnows are active, alert shoaling fish that spend much of their time moving through open water. A group constantly changes direction as it searches for food, responds to danger and explores its surroundings. They are generally peaceful, although their energetic behaviour makes them unsuitable companions for sluggish or delicate fish.

In the wild, Eurasian Minnows are associated with cool, clear and well-oxygenated water. They are especially common in shallow streams with gravelly beds, moderate flow and plenty of cover at the margins. Their tolerance of different conditions varies between populations, but they are fundamentally temperate rather than tropical fish.

Phoxinus phoxinus has a broad natural range and has long been familiar in European waterways. It is an important small prey fish for larger freshwater species and is also a useful indicator of clean, oxygen-rich habitats. Wild individuals can alter their colouration according to season, surroundings and social status.

Eurasian Minnows are native across much of northern and central Europe and large parts of northern Asia, including Britain, Scandinavia, Russia and the freshwater drainage systems of Siberia. They inhabit cool streams, rivers, springs and clear upland waters.

A group should have at least a 120-litre aquarium, with a footprint of around 120 cm by 40 cm preferred because these are active open-water swimmers. Use strong filtration and excellent aeration to maintain high oxygen levels, while avoiding an excessively turbulent current throughout the entire tank. Provide smooth gravel or rounded stones, open swimming space, hardy plants and sheltered areas around the edges. A secure lid is advisable because minnows can jump, and the aquarium should be designed as a cool, temperate setup rather than a heated tropical tank.

Up to 10 cm (4 in) in total length. Females are usually slightly larger and deeper-bodied than males, while males tend to be slimmer outside the breeding season.

Eurasian Minnows are omnivorous opportunists. Offer a varied diet of good-quality small sinking pellets or flakes supplemented with live or frozen foods such as daphnia, mosquito larvae, bloodworms and small insect larvae. They also consume tiny crustaceans, worms, algae and other plant material. Feed small portions regularly and remove uneaten food, particularly in a cool, well-filtered aquarium where excess food can quickly affect water quality.

Keep Eurasian Minnows with other peaceful, similarly sized cool-water fish that appreciate well-oxygenated conditions and some water movement. Suitable possibilities include other compatible native minnows, small danionins kept at appropriate temperatures, and carefully selected small loaches or other temperate stream fish. Avoid tropical species, slow-moving fish, long-finned varieties and large predatory fish. They are active feeders and may outcompete timid tankmates, so any community aquarium should be spacious and carefully observed. Check local regulations before collecting or keeping wild native specimens.

Eurasian Minnows are seasonal egg scatterers that usually breed in spring when temperatures rise and daylight increases. Provide clean, well-oxygenated water, a gentle current and a spawning area of smooth gravel or fine-leaved plants. Males develop breeding tubercles and court females, which release adhesive eggs among the gravel; adults should be removed or separated because they may eat the eggs. The eggs generally hatch within several days, depending on temperature, and the tiny fry require appropriately sized live foods.

Females are generally larger and fuller-bodied, especially when carrying eggs. Breeding males are often slimmer and develop brighter reddish colouration, stronger patterning and small breeding tubercles on the head and body; these features are much less pronounced in females.