Anyone keep these? I've been looking for information, but there isn't much out there. If anyone has kept or is currently keeping any I would love to hear about them, any pictures or video would be appreciated as well :]
Gymnotus tigre
- Thread starter happymidgetpaul
- Start date
http://www.monsterfishkeepers.com/forums/showthread.php?t=78977 
Hope that's enough info!
Matt Clarke looks at the stunning Tiger knifefish, or Macana tigre, a beautiful gymnotid knifefish from South America.
Copyright © Practical Fishkeeping
Common name: Tiger knifefish, Macana tigre
Scientific name: Gymnotus tigre
Origin: Mainly Colombia. The type specimen was collected in the Amazon at Letitia, but it's also found in the Amazon in Peru and Brazil, in the Rio Tapajos in Brazil and from Ecuador's Rio Pastaza.
Size: Museum records state an adult size of 40cm/16" for G. tigre, but this adult was probably more like 45cm/18".
Diet: Fish and invertebrates.
Aquarium: These electrical fishes are adapted for life in very dark peaty waters which don't even get much light during the day, so make sure the tank is very shady. Furnish the tank with bogwood and use a silver sand substrate. Males of the larger gymnotids can sometimes be aggressive, so be careful about mixing this with similar fish. Robust but placid cichlids, such as Heros, Acarichthys or Geophagus, should be safe tankmates. Given the large adult size, a tank of at least 120cm/4' is required for this fish, preferably much larger.
Breeding: Little is known about Gymnotus. Males of at least two other species in this genus construct and guard floating nests made from aquatic plants and foam, and G. carapo is a mouthbrooder.
Notes: This is quite a recent discovery. It was only described in 2003 by Albert and Crampton along with six other Gymnotus species. This one is a member of the Gymnotus carapo group.
Similar species: There are 26 Gymnotus species, with six in the carapo group: carapo; choco; esmeraldas; henni; paraguensis and tigre.
Identification: According to Albert and and Crampton, the world's experts on the Gymnotidae, there should be a series of pale, yellow bars on the flanks "with high contrast margins which are as broad or broader than brown bands anteriorly". The chin, operculum and under the eyes, should have irregular pale yellow blotches, and the tail end should have a series of oblique hyaline (transparent) and dark stripes on the back end of the anal fin. There should be also 190-240 branched rays in the anal fin, not that you'd be able to count 'em, though...
Availability: This fish was imported from Colombia by Tom Halvorsen Ltd and was the only one in the shipment. It's extremely rare in the trade.
Price: About ?200-300 for one like this.
Hope that's enough info!
Matt Clarke looks at the stunning Tiger knifefish, or Macana tigre, a beautiful gymnotid knifefish from South America.
Copyright © Practical Fishkeeping
Common name: Tiger knifefish, Macana tigre
Scientific name: Gymnotus tigre
Origin: Mainly Colombia. The type specimen was collected in the Amazon at Letitia, but it's also found in the Amazon in Peru and Brazil, in the Rio Tapajos in Brazil and from Ecuador's Rio Pastaza.
Size: Museum records state an adult size of 40cm/16" for G. tigre, but this adult was probably more like 45cm/18".
Diet: Fish and invertebrates.
Aquarium: These electrical fishes are adapted for life in very dark peaty waters which don't even get much light during the day, so make sure the tank is very shady. Furnish the tank with bogwood and use a silver sand substrate. Males of the larger gymnotids can sometimes be aggressive, so be careful about mixing this with similar fish. Robust but placid cichlids, such as Heros, Acarichthys or Geophagus, should be safe tankmates. Given the large adult size, a tank of at least 120cm/4' is required for this fish, preferably much larger.
Breeding: Little is known about Gymnotus. Males of at least two other species in this genus construct and guard floating nests made from aquatic plants and foam, and G. carapo is a mouthbrooder.
Notes: This is quite a recent discovery. It was only described in 2003 by Albert and Crampton along with six other Gymnotus species. This one is a member of the Gymnotus carapo group.
Similar species: There are 26 Gymnotus species, with six in the carapo group: carapo; choco; esmeraldas; henni; paraguensis and tigre.
Identification: According to Albert and and Crampton, the world's experts on the Gymnotidae, there should be a series of pale, yellow bars on the flanks "with high contrast margins which are as broad or broader than brown bands anteriorly". The chin, operculum and under the eyes, should have irregular pale yellow blotches, and the tail end should have a series of oblique hyaline (transparent) and dark stripes on the back end of the anal fin. There should be also 190-240 branched rays in the anal fin, not that you'd be able to count 'em, though...
Availability: This fish was imported from Colombia by Tom Halvorsen Ltd and was the only one in the shipment. It's extremely rare in the trade.
Price: About ?200-300 for one like this.
Thankyou very much! I have seen all of that though :] I was kind of looking for owners of this particular knife who can tell about their experiences with it, shyness, aggression, how active it is, pictures of their knife fish and tank set ups, etc.
Well, I have a Carapo Knife, which is related to the Tiger, and has very similar habits.
He will eat anything that he can fit into his mouth, same goes for a Tiger. Pellets, bloodworms, beefheart, prawns, feeders, etc.
As most Knives are, they are shy. However, once they get used to their feeding times they will come out of hiding once food hits the water.
Carapo Knives are extremely aggressive, mine would bite at my large male Oscar. (Bruce, one of my rescues if you look at the thread posted in my sig, you will see how big he is, lol) However, Tiger Knives are supposedly less aggressive. But they will still eat anything that they can fit into their mouths.
The tank setup needs a lot of hiding places. This may also help coax the Knife out of hiding. You will also need a good sized tank. 75-Gallon at the least I would say.
Are you purchasing one of these Knives? How much? If the price is less than $100, I'd make sure you are looking for info on the correct Knife, lol. I've seen Carapo and Zebra Knives both listed as Tigers before. Just making sure! 
He will eat anything that he can fit into his mouth, same goes for a Tiger. Pellets, bloodworms, beefheart, prawns, feeders, etc.
As most Knives are, they are shy. However, once they get used to their feeding times they will come out of hiding once food hits the water.
Carapo Knives are extremely aggressive, mine would bite at my large male Oscar. (Bruce, one of my rescues if you look at the thread posted in my sig, you will see how big he is, lol) However, Tiger Knives are supposedly less aggressive. But they will still eat anything that they can fit into their mouths.
The tank setup needs a lot of hiding places. This may also help coax the Knife out of hiding. You will also need a good sized tank. 75-Gallon at the least I would say.
Are you purchasing one of these Knives? How much? If the price is less than $100, I'd make sure you are looking for info on the correct Knife, lol. I've seen Carapo and Zebra Knives both listed as Tigers before.
Just making sure! 
Hoyo12;4261545; said:
In my experience on tiger knifefish is more aggressive than carapo knifefish. I both have the two knifefish and tiger knife is more active and will nip anything that tries to get near. As most gymnotidae they can bite and trash large food to small pieces. Will eat anything meaty that is offer. My carapo will just hide most of the time of stay still in one position while my tiger will cruise around looking for a fight or food.
Thankyou for the responses, I'm just planning, I'm not for sure getting one, I just thought they were really interesting fishes and want to know all I can about them. King-eL, when you say active, does this mean during day hours? Do you keep your tiger in its own tank or does it tolerate tankmates?
happymidgetpaul;4262679; said:
It will come out anytime it wants lights on or off. It got some snakeheads as tank mates and a goldline knifefish.