FAQs on Pangasiid Cats, Mainly the Iridescent/ID
"Shark"... Behavior
Related Articles: Pangasiid Catfishes,
Related FAQs: Pangasiid Catfishes 1, Pangasiid Catfishes 2, & FAQs on:
Pangasiid Catfishes Identification,
Pangasiid Catfishes Compatibility,
Pangasiid Catfishes
Stocking/Selection, Pangasiid
Catfishes Systems, Pangasiid
Catfishes Feeding, Pangasiid
Catfishes Disease/Health, Pangasiid Catfishes Reproduction,
Related Catfish FAQs: Identification, Behavior, Compatibility, Selection, Systems, Feeding, Disease, Reproduction, Minnow Sharks 1,
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Iridescent shark seizures 6/21/10
Hi There...
I searched your site, couldn't find an answer to my question. My 4
year old iridescent shark has been having seizures the last several
days. At first I thought it was the lighting, so I've kept it off,
no fix. The only thing I've changed in his environment lately is I
started feeding his tank mates a different type of flakes. Can you tell
me, is there anything I can do to help him stop having seizures? Should
I go back to the old food?
Thanks in advance for your reply...
Joey
<It's unlikely to be seizures as such, and more a fright
reaction. Unless your aquarium measures thousands of gallons, your
aquarium is too small. Seriously. I'm not kidding. Pangasius
hypophthalmus ARE NOT suitable for
home aquaria. They get to about 120 cm/4 feet long within a year or
two, and they live in groups, and they migrate up and down rivers.
Under home aquarium conditions they almost never adapt, and most
specimens die
prematurely for one reason or another. At the very least, they end up
damaging their eyes by throwing themselves into the glass walls of the
tank. Stunting is common, and despite the common myth, doesn't mean
the fish has "grown to the size of its tank" but instead
means the fish has been chronically stressed for a long time. If yours
is less than, say, 75 cm/30 inches, your catfish is stunted, and that
means it is probably being kept badly. In short, you need to make sure
the tank is very, very large, has an extremely strong filter [8-10
times turnover per hour] and that there are no aggressive tankmates
likely to spook them. Do not EVER keep this species singly; it is just
as social as a Neon tetra or Tiger barb, and will be just as stressed
if kept alone. I honestly wish I could say something more helpful, but
I really can't. These fish DON'T adapt to home aquaria, and
usually end up damaging themselves precisely in the way you're
describing. I doubt the change in food was the trigger, but possibly
the tankmates are behaving differently and that's alarmed your
catfish. Who knows. Without being told something about the size of the
aquarium or its tankmates, I can't really say anything more
detailed. I know I'm being super-negative here, but these are fish
that shouldn't be in the aquarium trade, and there's really no
excuse for shops to stock them or people to
buy them. Every aquarium book ever written has something like
"don't buy this fish" written down under the Pangasius
catfish name! Cheers, Neale.>
Iridescent Shark, beh., sys. 10/27/09
Hi, was just wondering if you ever heard of a fish slapping its jaws
together as if it was eating something but has nothing in its
mouth.
<Nope, not seen this. Might be some sort of threat display? Or could
be "gulping" water, a sign they aren't getting enough
oxygen.>
This is not constant but happens probably once or twice an hour. Since
they started doing this, they have been swimming really slow and kind
of hovering about an inch or two off the ground. The fish are
iridescent sharks,
<Pangasius hypophthalmus, I presume?>
one is about six to seven inches long and the other is about five to
six inches long.
<Ah, well, these fish almost never do well in aquaria. You do
realise how big they get? Easily 60 cm/24 inches, often 90 cm/36 inches
and in the wild more than 120 cm/48 inches. These are food fish, and
cannot be kept in home aquaria.>
They are in a 125 gallon tank,
<Too small.>
nitrate between 0 and 20, nitrite is at 0, hardness between 75 and 150,
chlorine is 0, alkalinity is 120-180, and ph is about 7.2. temp is
78-79.
The eyes are clear on both of them, I can not see any skin problems to
include the fins. The larger of the two damaged his nose when he was
introduced to the new tank about a month ago as he was really quick to
spook.
<All too common. These are riverine fish used to swimming freely.
They almost never adapt properly to home aquaria.>
He is no longer so easy to spook and his nose looks like it healed well
with no infection visible to the eye.
<Well that's good to hear.>
The fish seem to eat well only when we are a distance from the
tank.
<Indeed.>
They never used to do that, it really didn't matter if I was
standing right in front of it before.
<The bigger they get, the more space they need. In this teeny-tiny
tank (by their standards) they're feeling horribly cramped and
stressed.>
They also stopped taking food from the surface, they strictly eat from
the bottom now. Also was wondering what the max amount of fish you
would recommend for this tank as I keep reading how the groups are best
around 3 but I'm sure you will tell me the tank is currently to
small for 3 even at their current size.
<Indeed.>
Any opinions would be appreciated
Thanks
Billy
<Time to buy a much bigger tank, or else do what 99.9% of the people
who buy these fish end up doing, and that's finding a new home for
them at a zoo or public aquarium. These fish simply shouldn't be in
the trade, and I can't imagine why anyone would buy them. All the
aquarium books state very clearly DO NOT BUY THIS FISH and yet people
still do. Pangasius hypophthalmus are food fish, and no more suited to
home aquaria than farmed food fish species like Atlantic Salmon,
Channel Catfish, Common Carp, or Sea Bass. Cheers, Neale.>
Novice-need help!!!! Learn before you burn... FW
induced troubles 3/23/06 Hi I have been reading and I
think your website is amazing, probably the best out there!!! Thanks
for all your help!!!! You are all great!!! Anyhow, I am so new at this
and this is probably the most ridiculous questions but I need some
answers: 1- Today I've been seeing one of my ID sharks just sort of
laying around the plants (plastic) not being his active self, at one
point I thought he was dead cause he was just laying on it not moving,
then he rapidly moves across the tank and does the same thing on the
other plants? I have also noticed that he looks a bit swollen around
his belly, he wasn't like this before, my husband thinks it may be
pregnant but it's so tiny, I doubt that!!!?HELP!!!! I hope he is
ok!!! what should I do???? <When, where in doubt, a partial water
change... What do your water quality test kits show?> 2-I don't
know how big my tank is it looked pretty big to me when I bought it
was a complete tank with all access: heater, filter, food, etc..) The
filter it came with says it's for a 5 to 15 gal tank so I guess
that's it???!!!! <There are about 231 cubic inches in a U.S.
gallon... calculate> Anyway the question is, I don't know if
this tank is big enough -- for now-- <Maybe not... could be these
shark catfishes are just suffering from low dissolved oxygen... The
real root issue here is highly environmental...> I know I have to
upgrade eventually cause my fish will grow big but for now is it ok to
have 2 baby iridescent sharks(<2 inches each), 2 tiny upside-down
catfishes(<1/2 inch), 1 Pleco (about 2 inches) and 4 tiny neon
tetras? <Mis mixed> 3-How often does my tank need water change?
some say every wk. others say every 4 wks.? But just recently (3 wks.
after getting tank and fishes) I have noticed that the water is
starting to cloud up, should I change the water? 4-How often do I feed
my fishes? Food says 2-3 times a day, people at the pet store say 1-2x
daily and I had someone tell me that he feeds his fishes every other
day?????? So I've been feeding 1/daily???? <Posted... on WWM>
5- Should I feed my Pleco peas? Zucchini? will the other fish eat
these??? Is that OK? 6- and the most stupid question of all is::::::
When I clean my tank should I take my fish out and put them in another
small tank until I'm done cleaning or do I do this with the fish in
the tank???? Doing it while they are in there doesn't sound right,
but won't taking them out of the tank and then putting them back in
stress then out????? Sorry for all the questions but the
people at the pet store don't seem to know what they are talking
about, and already I'm attached to my fishes so I want to take very
good care of them, plus I'm excited to see them grow!!! Thank you
for your time and for answering all these crazy questions!!!! <These
issues are detailed on our site. Read, learn to use the indices, search
tool... Much for you to be aware of related to these issues. Bob
Fenner>
i.d. Shark 3/2/06 Hi there I just emailed you but
I just thought of another question sorry about that! My i.d. shark does
not seem to like to come out during the day but when I shut the light
off he comes out. It seems to me like he is just playing shy but we
have had him for3-4 months now. Why is he doing this? We have taken him
out a couple times and changed the tank around to see if that would
help because we were told that it could be a territorial thing but he
still just lies on the bottom of the tank and if he sees us looking in
the tank then he hides behind something. Can you explain to me what Ich
looks like please and what I can do if I get it in my tank? I have 2
fish I believe are pregnant and I do not want to take any chances with
Ich and just want to have a heads up about it. Thank you very much I
love your site it is so helpful. I have spend the last 3-4 months
looking for good information but I have not yet been able to find
anything. A lot of websites contradict themselves. Amy <Please see
WWM (use the Google search tool on the site) and Fishbase.org re this
fish... You will soon know its ultimate size and water quality
requirements make it incompatible here. Bob Fenner> <<
http://fishbase.sinica.edu.tw/Summary/SpeciesSummary.php?id=14154>>...
yes... five feet long... needs a six foot long tank, others of its own
kind...