Japanese scientists created a transparent goldfish (besides a transparent frog). The goldfish’s scales are transparent, you can actually see its organs, muscles and even its beating heart. These “see-through” fish can reach the age of 20 and can have a size of about 10 inch and weigh about 5 pounds. Professor Masayuki Sumida from Hiroshima university explains the “Ryukin” fish was created by selecting and breeding.

Transparant goldfish are useful for scientific purposes, offering a realistic alternative for dissections.

The most common way for goldfish diseases to spread from tank to tank is through the use of the same equipment in 2 or more aquariums.  The only surefire method of prevent cross contamination is to have a separate set of equipment for each tank.  However this can be expensive and impractical, so it is important to sterilise equipment properly.

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Hollow pond or aquarium ornaments come in all shapes and sizes, from sunken ships, to model houses, chinese temples, slightly open treasure chests, divers helmets, artificial wood, rocky caves, fake skulls, sea shells, or purely decorative.  Unfortunately they are a bad idea.

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Happy Goldfish now has a page for you to upload your goldfish photos, so get snapping and head over to the upload page to send in your goldfish photos.  We hope to have a gallery live on the website in a week’s time (10th November), and the first photos to be sent in will be on the first page of the gallery.

The fantail goldfish is a fancy goldfish, but it has more in common with non-fancy varieties.  It can survive and compete successfully alongside common, comet and shubunkin goldfish in ponds and aquariums.  It is also easy to breed, and an ideal fancy goldfish for beginners.

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Aquatic snails come in all shapes, sizes and colours. Their individual attractiveness is a matter of taste, but they certainly give an aquarium a more natural look, and perform some very useful functions to boot. Unfortunately, there are also some pitfalls that need to be avoided when keeping snails in a goldfish tank.

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More proof (if proof was needed) that goldfish are not 3-second memory organisms that don’t know how to have fun!

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Goldfish use a simple but efficient and interesting method of absorbing nutrients from their food.  They have no glands, valves, or two sizes of intestine.   Most unusual of all – even among fish – they have no stomach.  Most surprising of all, they have a set of teeth to get the digestion ball rolling.

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Depending on one’s point of view, the bubble eye goldfish is either a freakish mutant, or one for the connoisseurs.  One thing everybody agrees on is that it is a very unusual goldfish.

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There are two very different fish diseases that get called ‘black spot disease.’  One is caused by healing after injury (most commonly ammonia burn), and the other is caused by a parasite that infects the intestine of birds.  This second type of black spot disease is rare in fish tanks, but more common in ponds.

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