Animal Stories - Knifefish


Animal-World info on Black Ghost Knife Fish
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kye turnbull - 2013-05-12
is it usual for a 10 cm black ghost knife to eat a 5 cm gambusia affins?

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  • Jeremy Roche - 2013-05-12
    Some can be aggressive and will eat anything that will fit in their mouth.
  • kye turnbull - 2013-05-12
    mine is very easily scarred and is picky on what it eats it only ate one
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Melvyn Williams - 2013-04-30
Thanks for your advice regarding my BGK. I believe I will leave well enough alone for the moment. I purchased 2-1' Angel Fish yesterday. When I admired my tank in the morning, they had both 'given up the ghost'. They were fine last night, I always have the water tested before I purchase anything and it was fine. They had not been eaten so I want to refrain from the BGK being the culprit, however, I have 2-2' black sharks, who have now recognized their aggressiveness. Could they have become the new vultures of my tank? And if that may be the case will this change the overall character of my community tank of assorted loaches? Your assistance is appreciated. One more thing, I have some feeders (6) who managed to survive and are now 5' and about 1/2' thick that nip at each other. They started out as 1' last May. How big will they get?! WHO EAT MY ANGELFISH!!!

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  • Clarice Brough - 2013-05-01
    I bet the Black sharks are the culprits who got your angelfish. But on a positive note, if you are keeping a community loach tank, you should be fine... but Angelfish aren't going to do so well. On your feeder fish, I'm assuming you mean goldfish by the size you've described of 5'. They can get up to 14' on average though, so will get to be big fish. The tank will  need 20 gallons minimum for each of the goldfish, plus plenty of space for your Black Ghost Knife, so you may have to consider getting a huge tank - or maybe moving somebody! Good luck:)
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Melvyn Williams - 2013-04-28
I am so glad I found your site. I have owned BGKs for years and have just been facinated by them. My largest was about 18' in a 75 gallon tank. Anyway. I was always told you could only have one in the same tank for various reasons. Recently, a local retail dealer told me that you can have more than one in a tank, only you can not have two. Given all the comments and breeding scenarios on your site, can you shed some light on this for me. I have 150 gallon community tank and my recent BGK (Ribbon)is approximately 6' and has live comfortably with every one for about six months. Yes, I have occassionally noticed a fish or two mia, however, innocent until proven guilty (some of my community fishes have interesting traits). So I would like to purchase two more if that is possible. Could you give me your opinion please. For the record, I have a variety of Loaches (Clowns 5-2', [Blues, Zebras and Poka Dot 2 each sapprox 2'] Botias, Kulis 3-2') some green corys 2-2', black sharks 2-3', a spotted raphael cat 1- 3', golden sharks 2-2' NOW, angels 3-3' and assorted plecos4-2'-5'. Thanks.

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  • Clarice Brough - 2013-04-28
    The Black Ghost Knives are fascinating fish, and one of my favorites too. These fish don't like others of their own kind though, and are known to fight. Sometimes if a tank is very large, with lots of rocks and decor for fish to have their own territories and out of the line of site of those they don't like, aggressive fish can be kept in the same tank. But mxing them is a really tough call. You do have a large tank, but because these are also large fish  the tank isn't really so large for their needs. If you try mixing more than one, just be ready to separate them into their own tanks if they don't settle in together.
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Teresa Sloan - 2013-04-24
We just bought a BGKF last night. I had seen him the previous week-end and fell in love. We also bought a silver-tipped shark.  My question is more in regards to the filter system. When my husband started to leave for work this morning, we found we had a casualty last night in that (we think) the ghost had gotten too close to the filter and was sucked up. I don't think the filter end sits that close to the bottom of the aquarium, and he was so happy lying among the rocks. The shark seems fine, but I'm just wondering if the ghost did swim too close to the filter and got caught up in the suction or if perhaps something else had happened and it was just his remains that got caught there. We've had smaller fish in there with no problems of them being caught up in the filter.

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  • Clarice Brough - 2013-04-24
    So sorry to hear about your casualty. Iif your filter is really robust, with a lot of suction, you might want to cover it with some aquarium filter foam. That will keep any fish from getting sucked up.
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Animal-World info on Clown Knifefish
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Rocco Restelli - 2013-04-18
My fish seems to be going blind? Eyes seem different tha n normal. Please help.

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  • Clarice Brough - 2013-04-23
    There are a couple different eye problems that fish can have. You might be able to figure out  what's going on from the info on the Fish Diseases; Eye Problems page.
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Animal-World info on Zebra Knifefish
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Anonymous - 2008-09-11
I like this web site. It is pretty cool and cool for my kids to look at. It has cats and dogs, fish, and if you do not know this web site, look it up!

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  • kye turnbull - 2013-04-12
    how do they see this comment and dont know this website?
  • Clarice Brough - 2013-04-17
    Thanks for the kudos! We work hard to provide good info, and it's nice to hear your voice about it:)
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Animal-World info on Black Ghost Knife Fish
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kye turnbull - 2013-04-10
my black ghost knife wont come out of his tunnel! he just stays in there day and night,is this usual, theirs plants to dim the light and 2 tunnels and i feed live and frozen foods almost every day!

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  • Jeremy Roche - 2013-04-11
    That is pretty normal for them.  More then likely moves around when no movement in room.
  • kye turnbull - 2013-04-12
    all it needed was incouagement! i sang wooo go ghosty woooo ghosty wooo go ghosty! and he came out :D
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Gina - 2012-05-10
I have bought 2 bgkf and I have a 125 gallon tank. Both fish have died within a day of me buying them. I have 2 red tips a black shark and a rainbow shark. My water always tests fine pH is 7.0. I am confused and disappointed. I don't know what's causing the fish to die. Any help would be nice.

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  • Jeremy Roche - 2012-05-11
    Could be the place you got them from. How did you acclimate them to the tank? They stress very easy so a slow acclimation is best.
  • Anonymous - 2012-05-11
    I allowed the bag to float for 15 minutes and than released them into the tank. They were active and found a hiding place. Next morning they were fine and a couple hrs later they died.
  • lauren - 2012-07-19
    Try buying them from a different place.
  • Fred - 2012-09-01
    Maybe cause there was two of them, they couldn't really identify anything cause they were both sending electrical waves that kept intercepting the others.
  • peggy - 2012-10-13
    i had gotten my first black ghost knife from petsmart on sale for 8.60 somethin like that anyway he died two days later also bought other fish and put them all togather i noticed an outbreak of ick so i treated with ick- out he must have died from that i took him and the others to be replaced and got a big run around like they didnt want to exchange for another id wasnt takin no for the answer now two days ago once i brought new one home along with others i exchanged but did not put them in the same tank since im battling ick from the outbreak from the fish i brought home that also killed my few others i had in the tank a few months before i bought the black knife and others from petsmart anyway i put the newer fish in i exchanged in a qaurintene tank 20 gallon just untill the ich clears from my 30 when i put him and the other fish in the qaurintene tank i noticed white spots on them so i put ick out in right away and the next day spots seemed to be almost gone but i lost the ghost knife , i geuss ill be takin him back and exchanging him im sure with alot of disagreeing i did call next morning to petsmart in benton harbor, mi and told them about the ick and they probley have it the guy said he diddnt but i know they do but he told me to pick up some thing called ick-attack by kordon wich cost 11.00 so before i exchange themim makin sure the ick is gone but other then that can someone please e-mail me on what i can do better or whatnot so i can enjoy the black ghost knife for a long time my e-mail is dollmeup1@yahoo.com thanks and im sure ill get grief from petsmart takin back the ghost knife for the second time within 3 weeks but oh well its not my fault for the outbreak they will just have to replace him, so here is my story of my losses hopefuly no more after this woud be nice so i geuss im not the only one out here that has lost a ghost knife but maybe two wich i believe it the stores of there non knowledge of ick in there tanks that customers dont kow about or them for that matter, peggy
  • MsMonique - 2012-11-06
    I bought my first Black Ghost fish about a month ago from Petsmart and I fell in love, however about 2 weeks later I could not find it in the tank. I have a 150 gallon tank and I looked everywhere in the tank and cold not find it. No remains indicating he was dead. I just recently bought 2 more less than a week ago and they seem fine. You do have to watch the fish you get from Petsmart. I suggest not purchasing anytime from Thursday thru Tuesday as they get a new shipment in on Thursday and therefore you run the risk of disease and the fish being stressed out from the shipment. I experienced 2 bouts of ick from my fish there, before I realized it was best to have a quarantine tank set up for new fish and not to buy fish when they first get them in. I did however by my ghost fish 2 days later only because they don't keep them more than 2 days in stock due to the high demand. Thankfully my 2 have survived for 5 days today. Good luck!!
  • Breezy - 2013-03-16
    Ick is due to stress. All fish carry the ick virus, it's when they are stressed it comes out. It's like a common cold for us. Immune system is down bam we get sick. To blame it on pet stores is ridiculous. It could have been the stress from being transported to your tank,or the stress of being shipped to the store. you should be checking the fish out before you purchase it anyways, never rely on someone else even if they claim to be 'experts.' When medicating you should use half the dosage because they are a scaleless fish they cannot handle a full dose.
  • kye turnbull - 2013-04-04
    White spot is not carried by all fish! A parasite, ichthyophthirius multifilliis, it comes on plants, fish that have it, gravel or water! It's not in every fish!
  • kye turnbull - 2013-04-04
    Although you are right about the scaleless dosing.
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Anita Nyhus - 2010-10-20
Hello,

I was just reading your information about the black ghost, and I would just like to give a small update -
We bred this fish in our tank a couple of years ago, truthfully, we got lucky and we were quite ecstatic to find we had managed. At the time we thought we were the first ever to have bred these fish, but it turned out a guy in Finland had done it before us :)

However, also a tank owner in Queensland, Australia has been able to keep two babies.

Our little guy was found behind the filtration map, as the egg had been sucked in – there he developed without any disturbance, and so was the only survivor.

The male of the original breeding pair died, and the female was given away to another black ghost owner, and we have not had them for a while.

Only weeks ago, we bought ten black ghosts, so hopefully we will manage again. We keep them in 520 liters tank, with sand on one side and gravel on the other. Many roots and rocks, no surface plants, and give them lots of food, preferably red mosquito larvae.
The filtration is very strong, and I reckon we were "lucky" when the egg was sucked in. It could develop undisturbed on the back side of the "back to nature" background, where the other fish never entered.

I am sure there are several others that can now report that they have bred them, but at least I can guarantee you that it has been done :)


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  • julie - 2010-11-07
    We have a tank (75 gallon) and We had two ghost knife fish... who are very happy with their environment. And at the moment we have 9 offspring of different ages. Its getting to the point where we need to sell some!
  • tHyNOx - 2010-12-02
    Wow! How lucky you are.. how I wish I could do so too.
  • hanzo - 2013-02-08
    How did you manage to breed ghost knifes? We have one about 8inches long in a 5ft by 2ft community tank. They are my fav fish in the whole world and i would love to breed them =)
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blackghost - 2013-02-13
Just to clarify.... 1) BG Knifes also have a dorsal fin which is kept lying in a groove on the back 2) the anal and caudal fins are NOT fused 3) THEY ARE NOT SCALELESS

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