Description
The Ranchu Milk Cow is a highly prized variety of fancy goldfish distinguished by its rounded contours, absence of a dorsal fin, and striking black-and-white coloration reminiscent of a Holstein cow. Originating from Japan, this selectively bred fish is a variant of the traditional Ranchu goldfish and is cherished for its ornamental value, peaceful demeanor, and unique aesthetic appeal in aquascaped tanks.
Shop live aquarium fish online with confidence, with our livestock delivery guarantee.
Features of a Ranchu Milk Cow
-
Distinctive black-and-white “milk cow” pattern with no two fish exactly alike
-
Rounded, egg-shaped body with a pronounced arch in the back
-
Absence of dorsal fin, leading to a smooth, curved silhouette
-
Well-developed head growth (wen) that becomes more prominent with age
-
Typically grows to 12–15 cm in length in optimal conditions
-
Slow swimmer with a gentle, deliberate movement
The Best Aquarium Size for Ranchu Milk Cow
Due to their size and sensitive swimming capabilities, a minimum aquarium volume of 75 litres is recommended for one Ranchu Milk Cow. For each additional fish, increase the volume by at least 35 litres. Long, shallow tanks are preferable over tall tanks to allow easier access to the surface and reduce swimming strain.
Coburg Aquarium specialises in different species of live fish.
Tank Mate Compatibility for Ranchu Milk Cow
Ranchu Milk Cows are peaceful and thrive best with similarly tempered, slow-moving species. Suitable companions include:
-
Celestial Eye Goldfish
-
Bubble Eye Goldfish
-
Lionhead Goldfish
-
Pearlscale Goldfish
-
White Cloud Mountain Minnow
-
Dojo Loach
Coburg Aquarium specialises in different species of live fish.
Diet for Ranchu Milk Cow
A balanced diet is essential to prevent buoyancy disorders and maintain coloration. Feed a varied mix of high-quality sinking pellets, blanched vegetables (such as zucchini or spinach), frozen bloodworms, and daphnia. Avoid floating food to reduce the risk of air ingestion.
Browse our High Quality Fish Food online
Aquarium Setup for Ranchu Milk Cow
Aquarium Filtration
Use a low-flow filter system such as a sponge filter or a canister filter with flow control to maintain excellent water quality without producing strong currents.
Browse aquarium filters here.
Aquarium Plants
Opt for hardy, low-light plants like Anubias, Java Fern, and Hornwort. These are non-toxic and won’t be uprooted easily by digging behaviour.
Interested in live plants for your aquariums? Browse live plants here
Aquarium Lighting
Moderate lighting is sufficient. Ensure a consistent photoperiod of 8–10 hours per day using LED lighting to promote plant health and reduce algae growth.
Need aquarium lighting for your fish tank? Browse our Aquarium Lighting.
Aquarium Heating
Maintain water temperature between 20–24°C. Use an adjustable aquarium heater with a thermostat to ensure stability.
Looking for a suitable fish tank heater? Shop aquarium heaters here.
Aquarium Substrate
Fine sand or smooth, rounded gravel is recommended to prevent injury to the fish’s delicate underbelly.
Shop a variety of Aquarium Substrates here.
Aquarium Decorations
Choose rounded, smooth decorations without sharp edges. Avoid plastic décor that may damage the fish's wen or scales. Include open areas for swimming and shaded zones for resting.
Check out our huge range of Aquarium Ornaments.
