LA
Note the tiny catfish whiskers.
LA
Prologue. I first ran across
the blue shark or whale catfish a couple years back. I found them hard
to keep and even harder to photograph. We need an aquatic Ritalin to
slow these peripatetic fish biters to a photographical speed.
Although, following one with a camera does qualify as an aerobic exercise.
LA
Interesting nose holes or nares as we say in Des Moines.
Candirú Relative? Somewhat
similar to the candirú catfish which parasitizes the gills of larger fish
(not really the urethra of humans), the blue shark/whale catfish burrows
into the body of his lunch. Apparently, anglers catching larger
catfish find these guys still chowing into their unwilling host even after
the host was pulled from the river.
LA
Death slows these little guys to a photographic able and handleable speed.
Where Do Blue Sharks/Whale Catfish Come from?
You can find blue sharks/whale catfish fairly easily in the Amazon River and
some of the other rivers that flow into it. Anglers find them in
shoals. They're less often seen in the aquarium hobby (for several pretty
good reasons)
LA
Hard to see his teeth here.
LA
Teeth much more visible here.
LA
And here also.
LA
Probable male -- longer dorsal fin and slimmer shape.
How Do You Sex Them? If it's
important to you, you need several to see the difference in the sexes.
Males are slimmer torpedoes. Females are chunkier. You need to
assess them pre-prandial as opposed to after lunch. Blue shark/whale
catfish tend to gorge themselves at feeding time. Sexing is really a moot
point because you're not likely to spawn them (and who would want to?).
LA
Note the catfish whiskers. You can't see them when they're dashing
thru your tank.
Activity Schedule. You'll find
your blue shark/whale catfish VERY active when you first get him (or her).
Actually they're more active at night when they dine fashionably late.
They swim in schools like piranha but they don't work as a team likes packs
of wolves. They eventually settle down and pretty much lurk during the
day. Their eyes have been described as "small and piggy."
Actually, I think their eyes look relatively large. Maybe not as large
as a cichlid's but definitely larger than those of the caecilian worm.
Very few get past the first three lines on the eye chart.
LA
Photographed in a fish bowl because he would not stop dashing about.
Favorite Foods. In their native
habitat, they are often found dining on the gills of the redtail catfish.
And the gills of shovelnose catfish. This can run into serious cash.
Luckily, blue sharks/whale catfish also eat frozen foods like plankton and
krill -- even the freeze-dried ones. They also like feeder fish.
Feed carefully. They tend to gorge themselves.
LA
Favorite Water. Since blue
sharks/whale catfish come from
República
Federativa do Brasil, we can deduce that they like warm water.
Like most fsh, they prefer clean water. And they like a current --
easy to provide with any power head. They eat a lot so they appreciate
regular water changes.
Last Words.
We can't really recommend the blue shark/whale catfish for most aquarist.
Besides being hard to find; they are expensive. They eat your other
fish and grow up to 10 inches, so they need a larger tank. LA
Some Out Tanks
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