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Overview:

One of the most stunning and odd looking fish we can keep. The black ghost is sure to create a conversation. If you can meet its needs they can live for many years.

Quick stats: Listed tank sizes are the minimum Size: Up to 20" (49cm) Tank: 48 inches when small Strata: Bottom-middle PH: 6.0 to 8.0 Hardness: Soft to medium. dH range: 5.0 - 10.0 Temperature: 73ºF to 82ºF (23-28°C)

Paraguay River photo from Turismo Aventura

Classification:

Order:	Cypriniformes
Suborder:	Gymnotoidei
Family:	Apteronotidae
Genera:	Apteronotus
Species:	albifrons

Common name:

Black Ghost Knife Fish

Image gallery:

Additional species photographs

Discuss:

Badmans' Forum

Distribution

Northern, South America in the Amazon river basin

An elongated, laterally compressed species with a long anal fin that starts at the base of the pectoral fins. The caudal penuncle is also long, and the rounded caudal fin is very small. The small Dorsal fin is filamentous

The body and fins are a jet Black color, the base of the tail fin is marked with two wide vertical bands. There is a white stripe on the back starting at the head and extending about halfway down the body.

The aquarium for the Black ghost should be large with a small grained substrate. It should be fairly densely planted with many floating plants. The floating plants will help the fish overcome its shyness as it is nocturnal and sensitive to bright lights. Driftwood is also recommended along with some sort of inert piping for the fish to hide in. The water should be soft, and kept at a temperature of between seventy-five and eighty-two degrees. The pH should be neutral to acid. Feeding should be a mix of live tubifex brine shrimp and meaty frozen foods. The Black ghost is sensitive to water pollutants, changes in water conditions, and medications. Although timid they are aggressive to their own kind but can be housed with other large peaceful fish such as Angelfish, Discus and Gourami.


One of our readers hand feeding his ghost

Found in fast flowing waters of rivers and streams with a sandy bottom

Breeding:

Little (or nothing) is known of their sexing and breeding habits. It has been reported that they are being bred in Indonesia

Note 1/21/2005 here is a report of breeding, the site has pictures of the fry G&S Aquarium

Black Ghost Click photo to buy

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From: Christina Date:03/13/2009 I recently purchased a 4 inch BGK about a month ago and placed him in my 55 gallon tank. I have an old resin vintage car wreck and a large chunk of driftwood with holes and openings along it and he seems happy to alternate between the the two when going about his business. He currently shares the tank with a pair of 3 inch Discus, 3 swordtails, 2 angels, 4 Tiger barbs, an 8 inch Pleco and half a dozen zebra danios. All get on really well together and I haven't had any casualties as yet. The BGK seems to prefer the bloodworms to the flake food and freeze dried blackworms which the others eat. All in all he is a fascinating fellow to watch but I think I might have to purchase one of those moon lights for better observation. From: Christina Date:01/20/2009 I have had my BGK for about a year and it is one of the most interesting fish that I have had. At the moment he is in a 75 gallon with an elephant nose, dinosaur bichir, dragon goby, angelfish, gourami's, and a stripped peacock eel and they all get along great. The best thing that you give for food are bloodworms, brine shrimp, and mysis shrimp in the short time that I have had him he has significantly grown in size. This unique fish is a must for anyone who wants a real looker in there tank. From: Tian Date:05/9/2008 I've had my Ghost Fish for about three years now and kept it in some very hard water indeed. The Ph is usually in the region of 8-8.5 and although he has only grown to about five inches he appears to be in very good health and is very hardy indeed. From: Jeff Date:04/09/2008 A very interesting fish, often hiding at day, but if you spend the couple bucks on a moonlight, this fish will really wow you. I have one that is fully grown now, easily over a foot and I got him when he was only 4" or so. He's with my 3 foot silver arowana, 8" pleco, and 14" oscar. They all get along fairly well, and over time they will learn to accept pellets. I never feed feeder fish, and unless they are quarantined for over a month there is no need to. Feeders contain very little nutrition, try and get your BGK on a good quality pellet like Hikari, as well as tubifex, blood worms, brine shrimp and earthworms. From: Joseph Otley Date:02/21/2008 Just thought I'd throw in my own input. My own Black Ghost Knife has been living happily in a tank alongside a small school of Phantom Tetra's (red and black) and so far hasn't eaten any of them! The way I get my BGK to come out is by having numerous hiding places, as mentioned above. This seems to make him happy, and he will come out to swim more. As they are a nocturnal fish, they tend to only come out when the tank lights are off...which means you don't get to see much of them. You can get around this by having a UV light, or moonlight bulb, or just a desk lamp with a red light bulb...pretty much anything that doesn't give out a harsh light. Another thing to be careful of is when medicating your tank should, for example, a case of whitespot occurs amongst your other fish. Remember that the BGK is a scaless fish, so be very careful when medicating the tank. Your best option here is to remove him from the tank, and medicate him separately. Feeding - they love bloodworm, though you can ween them onto pellets and flakes. To really see him grow to his biggest, try and get hold of some beefheart. If you're in the UK, check out aquarist-classifieds.co.uk for people selling this. Hope I have been able to give some advice to anyone looking into getting their own black ghost knife fish in the future...best of luck! Joe From: Art Bell Date:8/31/2007 I bought my black ghost knife when it was 1 inch. It is now 6 inches. Its tank mates are 4 silver dollars, pinkish Chinese algae eater, brown African knife fish. They all get along just dandy probably because their sizes are close. My BGK absolutely loves frozen blood worms. It also likes high protein pellets, frozen brine shrimp. I would like to give it live blood worms but its hard to find in this area. I saw a tank with a dozen BGK. They seem to be over active with each other swimming around at different angles back and forth. When they fight they bite each others tails. I don't recommend putting more than one. I clean my tank once a week. They do seem to appreciate quality water conditions. From: Jeff Date:8/29/2007 Great tip if you own this fish! I purchased lunar lights for my 55 gallon tank and the second they flip on "Jack Knife Killer" is out and about. The lights make the tank look incredible and make the nocturnal fish very active and easy to watch. He ate out of my hand for the first time last night and it was amazing. Get the lights trust me they are inexpensive. From: Vinny D Date:8/8/2007 I came across black ghost knife fish quite by accident at the pet shop one day and just had to buy one. I was lucky to deal with the owner who understood its needs and told me to watch out for really small fish, and how some of these knife fish can be aggressive and some can be totally peaceful. So I picked a little guy (about 2 inches) and took him home. At the time I had a fairly new set up that I was slowly introducing fish to. I wanted fish that did well with a strong current since I cant stand cloudy tanks or dirty tanks and have fairly aggressive filtration in place. I bought a hollow "log" for him to make home and already had a huge roman coliseum in the tank for my smaller fish to swim in and out of. Turns out he preferred the latter and the little fish (and my tiny pleco) were forced to use the log instead of the roman ruins. I tend to hear a lot about how people go to sleep only to find a fish missing in the morning, usually something small like a tetra or guppy, in the beginning I lost a couple fish to (99.9% sure) "Mr. Wiggles" but after that he never touched another fish and I've had him now for almost 5 years. If kept comfortable they will almost always be really passive and tolerant to other fish, its also a good idea to keep him fed on a regular schedule to keep his mind from straying to nasty ideas of sneak attacks on one of his neighbors =) I've always been concerned about keeping him in good health and have found that ghost knifes can be quite hardy. I sold my home after a few years and had to move my fish (A nightmare!) to my new home and that meant putting everyone in a small container and setting up their old aquarium in its new location and hoping that they survive the stress of it all. I was pleased to find that I didn't lose a single fish, though the ghost knife didn't seem to appreciate not having his home in the moving container. One thing I love about this fish is that it has "personality", sometimes I wonder if we train them or they train us! He's learned now that I find it cute when he gets in his log and rolls upside down and just stares out the glass at me, usually he's rewarded with a few shrimp pellets and more and more I've noticed that when he's looking for a snack he'll keep an eye for me to enter the room, when he knows I'm watching he'll leave the coliseum and swim over to the log, wiggle into it (hence the name, Mr. wiggles) and then proceed to roll over and roll over till I get the hint and drop a few pellets into the water (often times I just put my hand in there and drop a couple right in front of him) after he's had his snack he'll leave and go back to his bigger home and nap the day away (if that's what he actually does in there lol). All in all I found my ghost knife to be a great few dollars spent, long lived, peaceful, smart and more hardy than often credited for. A good choice for anyone with a decent size aquarium. Oh and they're a very clean fish too! probably produces half the waste of my pleco that's 1/3 his size! CLICK HERE FOR MORE COMMENTS

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