help identifying these fish? - Tropical Fish Keeping - Aquarium fish care and resources

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post #1 of 29 Old 09-02-2009, 04:40 PM Thread Starter
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help identifying these fish?

ok so i've got home with some fish, i wanted 12 silvertip tetras, the bag had 3 types of fish in it.

one type is a harlequin tetra, but i need help to identify the others. they're prettier than the silvertips and the silvertips were the cheapest in the tank, so i got a bargain... but what are they?

i have 3 harlequin tetras looking a bit lost, and i can count 8 of greatly varying size of fish that look like black phantom tetras, without the black spot, with 2 red stripes in the tail fin, and pinky/silver tips to their black fins. any ideas? and i have 1 black phantom tetra who is sticking to my neons and looking very lost and forlorn.

help please?
mand x
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post #2 of 29 Old 09-02-2009, 04:52 PM Thread Starter
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ahhh i think i have solved it, they look like bentos(i?) tetras! what should i do about my lone black phantom? get a few more? or will he become an honorary neon? mand x

ps added a pic of what my 8 fish look like, are they bentos/bentosi or white tip or are they the same?
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File Type: jpg Hyphessobrycon_bentosi2.jpg (57.9 KB, 78 views)

Last edited by mandimoo; 09-02-2009 at 05:01 PM.
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post #3 of 29 Old 09-02-2009, 05:27 PM
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i have the same tetra and they were labeled as an unnamed species...They were designated as HY511 Tetras...I have seen them for sale at various sites and fish stores under different names........Do a goolge search and see if other pics look like yours......i would pick up a few more black phantoms, if your tank has the space for them.......Hope this was some help
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post #4 of 29 Old 09-02-2009, 05:31 PM Thread Starter
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the picture off google calls them bentosi, but other pictures say the bentos/bentosi are 'fake' rosy tetras, and call these ones white tips instead.
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post #5 of 29 Old 09-04-2009, 11:41 AM
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The fish in your photo is a female Hyphessobrycon bentosi rosaceus, usually commonly called the Rosy Tetra.

There are several closely-patterned and coloured species of Hyphessobrycon and there is still some confusion over the various species; indeed, a revision of the entire Hyphessobrycon and Hemigrammus genera, which differ only in the scaling or lack thereof of the caudal fin, is pending.

Hyphessobrycon bentosi bentosi and H. bentosi rosaceus are near identical, except the latter has no shoulder patch [a dark patch behind the gill cover]. Males of both species have the significantly longer dorsal fin and it has less white at the tip.

Closely related is the "Roberts" Tetra, usually referred to as Hyphessobrycon robertsi, although this is not strictly speaking a valid scientific name. Sometimes considered to be a hybrid of the other species, Gery did determine it to be a distinct species although (to my knowledge) it has yet to be scientifically described and named. Within this same general colour/patterning group is the common Bleeding Heart Tetra, the Serpae Tetra, the Callistus Tetra, etc, though these are more distinct species from the three afore-mentioned.

Small photos (not the best I admit) of the three species are attached. H. bentosi bentosi is the left photo, H. bentosi rosaceus on the top right, and H. robertsi the lower photo.

Byron.
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File Type: jpg Hyphessobrycon bentosi bentosi.jpg (12.9 KB, 75 views)
File Type: jpg Hyphessobrycon bentosi rosaceus.jpg (22.6 KB, 76 views)
File Type: jpg Hyphessobrycon robertsi.jpg (68.4 KB, 77 views)

Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]

Last edited by Byron; 09-04-2009 at 11:43 AM.
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post #6 of 29 Old 09-04-2009, 03:24 PM Thread Starter
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well they all have fairly significant white tips, so do i presume they're all females? i wasn't looking to breed them, they just looked pretty! they are looking 'pinky' rather than the silver i first described, maybe the food i use has more colouring than the one used at the petshop, i also feed bloodworm once a week and i believe the pet shop doesn't, could that alter the colouring?
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post #7 of 29 Old 09-05-2009, 12:23 PM
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Quote:
Originally Posted by mandimoo View Post
well they all have fairly significant white tips, so do i presume they're all females? i wasn't looking to breed them, they just looked pretty! they are looking 'pinky' rather than the silver i first described, maybe the food i use has more colouring than the one used at the petshop, i also feed bloodworm once a week and i believe the pet shop doesn't, could that alter the colouring?
The length of the dorsal fin is a better guide, the male dorsal fin is noticeably much longer and arcs (curves) over the back of the fish very gracefully. I have a group of H. bentosi rosaceus and H. robertsi in my 115g, and several of the male robertsi have dorsals that are so long they actually drape down below the back of the fish, quite extraordinarily spectacular in my opinion. The photos I included previously show a male and female for H. bentosi bentosi and H. b. rosaceous, and I believe for H. robertsi although these photos are as I said not the best.

If you have the tank space (they do need room for swimming as well as plants along the back) you should try to get a trio of males (or perhaps exchange a couple of your females for males if they have them). The continual displays of the males, very similar to Hyphessobrycon megalopteris (Black Phantom) and many other characins, is a fascinating site to behold. They constantly challenge each other, circling (sometimes at very fast speeds) with fins flared, colours intensified, and at 45 degree angles to each other. No damage ever results, it is "show" clearly, although they are probably in earnest. And they are ready spawners in a community tank, although they and any other fish will devour the eggs the moment they are expelled; but the ritual is still fascinating to watch.

Byron.

Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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post #8 of 29 Old 09-08-2009, 10:41 AM Thread Starter
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overnight i've lost a selection of tetras (about 6), a few neons, a couple of the 'mystery' species and the one black phantom, some of the larger fish have fin damage, either one of my fish (angel fish or betta) went crazy and attacked them or i have finrot, i've done a treatment for finrot, fingers crossed it works.

mand x
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post #9 of 29 Old 09-08-2009, 11:21 AM
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Are you sure it is not a columnaris outbreak?
Its fairly common and highly contagious. Can you take some pictures of the fin rot?

Last edited by Twistersmom; 09-08-2009 at 12:09 PM.
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post #10 of 29 Old 09-08-2009, 11:58 AM
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Quote:
Originally Posted by mandimoo View Post
overnight i've lost a selection of tetras (about 6), a few neons, a couple of the 'mystery' species and the one black phantom, some of the larger fish have fin damage, either one of my fish (angel fish or betta) went crazy and attacked them or i have finrot, i've done a treatment for finrot, fingers crossed it works.

mand x
Finrot killing so many fish overnight is highly unlikely. As Twistersmom said, it may be something else, pictures would help. But off the top of my head...angels will try to eat neons and any small fish, so this could be the problem. Any disease not noticed yesterday would be unlikely to decimate so many fish overnight, whereas an angel that has now shown its true behaviour could.

Byron.

Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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