A WAY TO RAISE RANCHU ● CULLING

The Purpose of Culling

It is absolutely necessary to perform selection and culling to keep up and improve upon ranchu quality. In one spawn, ranchu can produce a lot of fish with undesirable characteristics. Strict selection of the fish with true ranchu qualities will assure that ranchu breed stays alive and continues its high quality traits.

During Ranchu Culling

Choose shady and well ventilated place during culling process. Sudden water temperature change will kill the fry. It is outmost important to keep the temperature as even as possible during selection and transfers of the fry from one container to another.

Choose large enough container size for culling and do not overstock. Overstocking and too small container will result in lack of oxygen. Also, water temperature in small container tends to fluctuate more freely in response to the air temperature.

To prevent water temperature change and lack of oxygen, floating box with netted bottom can be used to house the fry. The box floats in the pond, keeping the water parameters stable.

Culling Mistakes 

Often, a novice tends to keep most of the fish and performs selection and culling much later then required. The culling rounds must be performed on schedule. Overstocking may result in underdeveloped and lower quality fish.

During the early fry stages it is easier to identify many defects and major imperfections. That's why first culling round is performed drastically. The following rounds require more mastery and training, as one searches for the fish with superior qualities.

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Links to published chapters:

● INTRODUCTION
● WATER
● NOTES ON GREEN WATER & WATER CHANGE
● WATER TEMPERATURE
● AERATION
● SUNLIGHT AND SHADE
● CONTAINERS FOR RAISING RANCHU
● FOOD
● FEEDING REGIMENT
● BREEDING & SPAWNING
● RAISING & GROOMING FRY
● GROOMING KUROKO AND TOSAI
● CULLING
● SELECTION METHODS
● CULLING ROUND - I
● CULLING ROUND - II
● CULLING ROUND - III
● CULLING ROUND - IV
● CULLING ROUND - V
● FORSEEING RANCHU CHANGES IN THE FUTURE

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