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Robyn's Goldfish Page Four

Last Updated: 11/12/06

I started this page on 7/7/04 because I had a few topics I wanted to add but did not know where to put them. I moved over the goldfish health section to reduce the size of the main goldfish page and give this page more of an average length.

Goldfish Health

Goldfish seem to be very prone to parasites. My fish health pages have extensive information on many topics which are all relevant to goldfish.

Trouble Swimming:

Fancy goldfish are prone to problems swimming and maintaining their buoyancy. They may lay on the bottom, be upside-down, float at the surface (sometimes upside-down), swim with their rears in the air, or otherwise have trouble getting around. This is much more rare in normal kinds of goldfish (common, comet, and shubunkin) as they are not deformed. Fancy goldfish are deformed mutations that would never survive in the wild. They are much more delicate. The fatter the bottom, the more abnormal they are. Their swim bladders may be in the wrong place. They could have swim bladder disease. With any goldfish, swimming problems can be associated with a malfunctioning swim bladder, kidney disease (with swelling), tumors (bacterial or cancer), hard food, or any illness temporarily. By hard food, I mean dry foods given dry that may swell in the goldfish's gut. They can also produce gases. For that reason, people often suggest pre-soaking food a few minutes in water or feeding, at least when a problem appears, cooked, peeled peas and other fresh vegetables (cucumber, spinach, kale, anacharis sold as aquarium plant, etc.). It may also help to maintain low levels of salt (a tablespoon of aquarium salt (NaCl) per 5 gallons. Aside from this and a good diet and good tank maintenance (clean water), there is little treatment that will help a goldfish get around that is swimming abnormally. Sometimes, such fish will recover on their own. Other times they will deteriorate over time until they can no longer feed and then starve to death. Often, they do not change but can function just fine even though they spend some time upside-down or sideways or whatever. If the fish is abnormally fat, see the section Why Is My Fish Fat?. Note that fancy goldfish are normally fat-bodied and some kinds even appear to have dropsy like the pearl scale but that is normal for them.

Color Changes:

I have gotten many questions about goldfish changing color. It is normal for goldfish to change color throughout their lives, but especially the first two years. For more details, see my section on color changes on my goldfish breeding page. Also, some people note black marks on the edges of their goldfish's fins. If the area was injured, then this indicates that the fins are trying to heal and is a good sign. Also, some of the normal color changes may occur along the edges of the fins. Only if there appears to be black spots that are small in various areas, is black spot (a parasite) a concern. If the area does not appear to have a bacterial or fungal infection, there is probably no cause for worry.

Here is a photo of a young goldfish in my 1800 gallon pond in the midst of his/her color change when a few inches long in April of 2003.

Pauline sent these photos of her goldfish on 10/12/06. The goldfish are a bit anorexic and may have medical problems but the black spotting is a color change in progress. I put these photos on my site to show what a goldfish changing color looks like.
Goldfish changing color
Goldfish changing color and two shubunkins

Torn Fins:

Many people also ask about torn fins. First, will they grow back? It depends on how damaged the veins or supporting structure of the fins are. If the support structures (like the veins of a leaf) are gone, the fin will not grow back fully. If they are intact, it may grow back completely. Either way, the fins will probably never look like they used to look. Even if the fin is totally gone, it may grow back partially, but will probably look abnormal. Fins are often ripped by other fish or injury or sometimes from an infection. So the second question is how do you treat torn fins? If the fins show no signs of fungus or bacteria, then try salt and MelaFix. If the fins have fungus, use a fungicide. If there is an infection, use antibiotics. Some antibiotics will kill good bacteria so be careful. Erythromycin such as found in Maracyn by Mardel does not harm the good bacteria. Salt treatment should be about a tablespoon per 2-5 gallons (I use a tablespoon per 5 gallons at all times). Use only pure sodium chloride like that sold for aquariums or ponds or marine salts. Do not use salt with iodine such as table salt. Salt will stave off infection and help prevent electrolyte loss to the water. Also, MelaFix by Aquarium Pharmaceuticals may be added which contains tea tree extract. It is safe for everything but will cause some foaming on the surface and smells a little bit. Tea tree is a natural antibiotic and antifungal. A little aloe added to the water may also help aid healing. Or, add something like Stress-Coat which contains aloe. It is also a dechlorinator. After a fin is injured, when it is properly healing, the edges often turn black. This is normal and means the wounds are healing as expected.

For similar information to treat physical injuries, see the Pond Tidbit #1 in the March 2003 Pond Newsletter.

Feeding Goldfish

There are literally a hundred varieties of prepackaged flakes, floating pellets, sinking pellets, and many other sorts of goldfish foods. I will not go into them here. Most are very good. I like to feed variety. As the staple food for goldfish in aquariums, I use Tetra goldfish flakes. In my main pond, all the fish mostly get Pond Care summer pond food floating pellets. For fancier, more valuable fish and those with bigger wallets, the Hikari brand goldfish foods are very good. I do not want to delve too much into commercial goldfish foods. The purpose of this section was to discuss problems with feeding and feeding fruits and vegetables.

Some fish, notably fancy goldfish with enlarged bodies like fantails, orandas, etc., often have problems with digestion and buoyancy. Some of these problems can be worsened by feeding dry foods to them. If the foods are too dry, they may expand in their gut causing gas, bloating, and buoyancy problems. To prevent this, you can presoak dry goldfish foods for a few minutes in some water before feeding.

It is often recommended to feed peas to fancy goldfish that are having problems with digestion and/or buoyancy. Frozen or fresh peas should be cooked and then peeled. I once fed peas but was too lazy to peel them. They got jammed up in the goldfish's mouths. However, for huge goldfish, this probably would not happen. The peas act as kind of digestion medication. Goldfish scarf them up.

Goldfish will eat many vegetables, fruits, and aquatic plants. In the process, they may make a mess! Cucumber, squash, or zucchini can be cut in half and then into a few inch slice. Use a grapefruit spoon to scoop out the seeds. The resulting piece of food (which I feed all the time to my plecostomus) can be attached to a sinking veggie feeder sold just for this purpose (I have a few) or anchored somehow. On the bottom, it could be tied to a rock. On the side of the tank, it could be attached to a veggie clip which is just a clamp on a suction cup. The goldfish will suck on those veggies (technically, those three are fruits). To veggie clips, you can also try to feed goldfish leafy greens like kale, green leaf lettuce, etc. Do not feed iceburg lettuce. Lettuces will be shredded by the goldfish. Peas as described in the previous paragraph can just be dropped into the tank. They should float where the goldfish can suck them up. You can experiment with other fruits and vegetables. Your goldfish may like one that mine did not or I never tried. I once tried grapefruit in my pond for the koi and goldfish. They were supposed to like it. They ignored it.

Goldfish love to eat aquatic plants. In fact, many of us wish they would not eat so much of them! When I had goldfish in my aquarium, any aquatic plant I put in there was quickly shredded. For feeding purposes, anacharis is a favorite submerged plant for them to eat. They will eat most submerged plants. The ones that lasted the long in my tank were onion plant and java fern. In the end, they even ate those. They are not supposed to eat java moss. Well (like our deer), no one told them that! In my ponds, the goldfish have many more plants and animals to choose from and much more room. So, they do not eat all the pond plants. However, I have tried repeatedly but cannot keep submerge plants like anacharis, cabomba, and hornwort alive for long. Even in submerged plant protectors, they find their way to eat them.

Telling Goldfish Fry from Koi Fry

Do you have both goldfish and koi in your pond? Do you have fry? Do you want to know if a fry is goldfish or koi? Here are some things to keep in mind. If you have other fish, then it becomes even more complex!