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Re: New group of 6 Microglanis iheringi... or are they?

Posted: 04 Jan 2021, 19:55
by bekateen
Shane wrote: 04 Jan 2021, 12:21 The entry in the Cat-elog for M. secundus in the Catatumbo is a mistake that needs to be fixed. I am sure it is based on a mistaken identification in Galvis et al's peces del Catatumbo. As you can see at a glance, the fish they found is not secundus.

So many "Fishes of" books and papers are riddled with mistaken identifications because the authors simply can not have expertise on every genera they encounter.

Also note that two distinct spp are shown. Is the Microglanis in the Catatumbo the fish in the line drawing or the photo? I can only guess that the line drawing is correct and the photo is simply of a Microglanis they found at an exporter in Bogota. Note the opposite patterns on the paired fins. The drawing shows dark fins with light edges. The photo shows a fish with dark fins that lighten near the body.
-Shane
Indeed, on that I agree with you. I think that happens often, where (as I've also been guilty of in this thread at different times) investigators try to identify fish they find based only on the existing species names, rather than being more open to the idea of their fish being a different species (not to say I advocate as a splitter; I tend to be a lumper myself). For example, here's a report of Microglanis cf. secundus in the Rio Trombetas, which I suspect is a misidentification (at least they had the wherewithall to use "cf"):
Ferreira, E. J. G. (1993). Composição, distribuição e aspectos ecológicos da ictiofauna de um trecho do rio Trombetas, na área de influência da futura UHE Cachoeira Porteira, Estado do Pará, Brasil. Acta Amazonica, 23, suppl. 1, 1-89. wrote:Tabela 11. Lista das especies exclusivas das regioes a montante da cachoeira Porteira (Rio Trombetas drainage): Microglanis cf. secundus
Perhaps unfortunately, these Rio Trombetas specimens are now accepted by at least some authors as M. secundus sensu stricto, as revealed in subsequent publications (e.g., Mori & Shibatta. 2006. Zootaxa, 1302, 31-42). I suppose, in that example, if the fish can just get over the mountains from Guyana, they might drop down into the Trombetas. :)) While I know there have been papers written to explain why fish discovered in Guyana and Suriname should be expected to be present also in some Amazonian areas of Colombia and Brazil, I struggle to imagine that many of these applicable species have remained unified genetically over history.

I also suspect, and I've mentioned it earlier in this thread, that this type of misidentification you describe (and the consequences of it in terms of future investigators simply taking a past author's word for an ID) applies to also.
Microglanis poecilus collection records
Microglanis poecilus collection records

As to your recognition that the illustrations in Galvis et al.'s paper are mismatched and incorrectly ID'd, yes I think so too. In fact, I'd go farther and propose that neither image in Galvis et al. shows M. secundus based on Mees' original drawing. First, here again are the photo and drawing of "Microglanis secundus" from the Galviset al. paper; both images are retouched here for details. Next, I'll add the photo, just a few pages later in the same book, of .
Microglanis secundus, photo page 62 (retouched)
Microglanis secundus, photo page 62 (retouched)
Microglanis secundus, drawing page 62 (retouched)
Microglanis secundus, drawing page 62 (retouched)
Batrochoglanis acanthochiroides, photo page 68
Batrochoglanis acanthochiroides, photo page 68
Notice the dark color fin markings on B. acanthochiroides - they almost exactly match the Galvis et al. drawing of M. secundus. Also notable is that the drawing of B. acanthochiroides on page 68 (which I did not reproduce here) bears no resemblance at all to the color pattern shown in the photo of B. acanthochiroides... Perhaps the M. secundus drawing is mismatched and belongs with B. acanthochiroides? If that is the case, then what kind of fish is the "M. secundus" photo?

Shane, you noted that the drawing shows a fish whose paired fins have a hyaline margin and that the photo doesn't show that. Myself, I'm inclined to take that with a grain of salt based on this single photo, since at least the pectoral fins in the photo are evidently damaged (perhaps not the pelvics); any hyaline margin might easily be lost, leaving the impression that the fins are dark to the margins. Conversely, what I see as most different between the photo and the drawing is the fact that in the photo, the tail is almost entirely hyaline but the drawing shows a very dark marked tail; while I've found a lot of variation in the tail color pattern in my Microglanis, that picture seems extreme. But perhaps the tail pigmentation is a growth-dependent trait (I know my Microglanis have developed more tail pigmentation just since I've had them, as is evident in my videos): Supporting that possibility, the museum specimens which Galvis has on file have been reexamined and identified as juvenile B. acanthochiroides: Here is an excerpt from a more recent paper on the Fishes of the Catatumbo:
Ortega-Lara, A., Lasso-Alcalá, O. M., Lasso, C. A., de Pasquier, G. A., & Bogotá-Gregory, J. D. (2012). Peces de la cuenca del río Catatumbo, cuenca del Lago de Maracaibo, Colombia y Venezuela. Biota Colombiana, 13(1), 71-98. wrote:On the other hand, the records of Microglanis secundus are from a juvenile specimen of Batrochoglanis acanthochiroides (Ortega-Lara obs per.)...
Perhaps significantly, this paper reported NO Microglanis in the Catatumbo drainage. While I would not be surprised to find Microglanis in the Catatumbo drainage, for now I have no references to document them there.

All the above discussion aside (about the absence of M. secundus from the Catatumbo drainage), I'd like return to the point of my previous post, and that is this: Microglanis secundus bears no resemblance to M. poecilus, but rather it bears some resemblance to M. iheringi, both the true M. iheringi and to the Colombian "M. iheringi" (although how close cannot be reliably estimated due to the poor quality of specimens of both M. secundus and of true M. iheringi).
Shane wrote: 04 Jan 2021, 12:21The entry in the Cat-elog for M. secundus in the Catatumbo is a mistake that needs to be fixed.
Done. Thanks.

Cheers, Eric

Re: New group of 6 Microglanis iheringi... or are they?

Posted: 09 Jan 2021, 03:13
by bekateen
So I put some of my stimulus money to use today. Can't yet say it was "good use" but maybe. Twenty six new Microglanis from same source as my first groups, although this is a different shipment. These fish are small too. Whereas the first 18 fish were 45-65mm SL at purchase, these 26 fish are 25-35mm SL.

A lot more variation in the color patterns too, although all of them appear to be variants of the iheringi-like body plan. Some of the variation is shown below. My hope is that these variations will result in adults that look different from each other. My worst-case scenario is that much of this variation is just a combination of stress fading (because they're at a fish store) and ontogenetic maturation, meaning they'll grow into their colors and change exclusively into the typical adult colors I have already.

With their diminutive size, I know some species are reportedly this small, so maybe they are something really different. However, I expect they are just juveniles and that they'll grow to match my original fish in size.

Why did I buy so many? (1) at the shop, even though I got to select my fish from the holding tank, I did have to make some snap judgements. I thought it was better to get fish than skip them and miss something different. (2) if there is a different type in here, I wanted to increase my odds of getting more than one of it.

Well, now I hope for the best and wait. :YMDAYDREAM:
Cheers, Eric

Re: New group of 6 Microglanis iheringi... or are they?

Posted: 09 Jan 2021, 03:34
by bekateen
If you don't want to see one fish at a time, here they are together.
Polish_20210108_190021767.jpg

Re: New group of 6 Microglanis iheringi... or are they?

Posted: 10 Jan 2021, 18:52
by Shane
Keep the info coming Eric. I am betting you now have the largest collection of this genus outside the wild!
-Shane

Re: New group of 6 Microglanis iheringi... or are they?

Posted: 10 Jan 2021, 20:45
by bekateen
Shane wrote: 10 Jan 2021, 18:52Keep the info coming Eric.
Thanks Shane, will do. My biggest disappointments are
  1. that I cannot ascertain better information on locality, beyond "Colombia" (I've contacted the wholesaler to see if they'll connect me directly with the exporter, but we'll have to wait to see if that bears fruit.), and
  2. that all of the fish I'm getting appear to be iheringi-like, although some of these babies, assuming they keep their broken patterns into adulthood, may prove to be more like or even in appearance (I'm saying not saying mine are either of those, but that they may share a similar color patterning).
What I'd really like to get my hands on are fish like the following, to get some variation beyond just the shape of the subdorsal saddle. But all the exports I'm seeing are coming out of Colombia, so... I get what I get:
Shane wrote: 10 Jan 2021, 18:52I am betting you now have the largest collection of this genus outside the wild!
Whaaaat? Doesn't everyone keep 44 bumblebees? =))

Cheers, Eric

Re: New group of 6 Microglanis iheringi... or are they?

Posted: 15 Jan 2021, 01:52
by bekateen
Total aside to the focus of this thread:

Grenand, P., Chapuis, J., Cognat, A., Cristinoi, A., Davy, D., Grenand, F., Jégu, M., Keith, P., Martin, E., Nemo, F., Pagezy, H., & P.Y. Le Bail. (2015). Revision of vernacular names for the freshwater fish of French Guiana. Cybium, 39(4): 279-300.
https://hal.archives-ouvertes.fr/hal-01254935/

According to this paper, the local Wayãpi name for in French Guiana is "yawanukunuku sili."

... Write that on a USFWS import eDec and see how they deal with it. It's no wonder we don't get more imported for the hobby. :))

Cheers, Eric

Re: New group of 6 Microglanis iheringi... or are they?

Posted: 18 Jan 2021, 22:20
by bekateen
For a treat, I fed the new and very little Microglanis some live blackworms today. This is one of the middle-sized fish (about 30mm SL or so). Even at this tiny size, these little fish can pack away the food. I suppose that's the upside to not being "armored" like Callichthyidae and Loricariidae. :))
Microglanis aff. iheringi 2021-01-18.jpg
Microglanis aff. iheringi 2021-01-18_dorsal.jpg
I really like the broken subdorsal brown saddle that so many of these new fish have. I can't wait to see how they'll grow out (I presume they are not full grown at this small size).

Looking more closely at this little fish, I think the broken subdorsal saddle resembles other Microglanis spp. moreso than . To support this, I use the photo above to zoom in on the pectoral spine. For better clarity, I used the right pectoral fin and flipped the image (I thought the spines were easier to see on the right pectoral fin than on the left. I then caught a second fish and placed it on a microscope stage and used the 'scope's camera to photograph its pectoral spine too. I juxtapose both images against the the pectoral spine drawings of the other species: https://www.planetcatfish.com/common/ca ... orsal+view

Although I know that spine serrations are somewhat unreliable (esp. in juveniles) and although it's difficult to make out all the detail, I' think these pics support the idea that my fish are not M. iheringi.
Photo taken with cell phone
Photo taken with cell phone
Photo taken with Leica microscope (Different fish from first photo)
Photo taken with Leica microscope (Different fish from first photo)
I'm not 100% convinced these two photos of these two fishes match each other exactly, but they are similar. Both of the photos of my fish clearly show nine to ten retrorse serrations on the posterior margin of the spine, with the serrations either of approximately the same length or elongating progressively as you move to distally (vs. clearly peaking in length midway along the spine and shortening in the final distal portion), and with the serrations becoming progressively wider at their base along the spine distally, and with all but the most distal serration approximately parallel and the most distal serration changing orientation to create a wider angle between it and the second-to-the-last serration. The posterior serrations stop before reaching the end of the spine, leaving a significant length of spine unserrated (both anteriorly and posteriorly), with a slight anterior-leaning deflection.
On the anterior margin of the spines, I can see retrorse serrations, smaller than those of the posterior margin, present at least for the first 1/2 to 3/4 of the spine; unfortunately, in both photos, the pigmentation makes a more precise narrative of the anterior serrations impossible from these photos.

There is much similarity between the spines of these two catfish of mine and that of M. pellopterygius, although my fish are definitely not that. My fishes' spines also resemble that of M. zonatus (which might be more plausible given body color pattern, although it would require the old drawing of the M. zonatus spine to be rather inaccurate.

Cheers, Eric

Re: New group of 6 Microglanis iheringi... or are they?

Posted: 19 Jan 2021, 01:03
by bekateen
Here are pics of the pectoral spine of a third specimen from this most recent purchase. Alas, this fish has an intact "iheringi"-like, solid colored dorsal saddle, rather than a broken saddle like the other two fish. Why is that an alas? Because the pectoral spine looks about the same on all three fish. I was hoping that the fish with intact saddles would have a different pattern to their pectoral spine serrations relative to that seen in the fish with pale spots or breaks in their subdorsal dark saddles.

Even the spine of looks pretty close, although the other fish features don't match: https://www.planetcatfish.com/common/im ... ge_id=7602

Thinking back to the first two spine photos, I can somewhat convince myself that the first is different than the second and third, but that may just be camera resolution. I wish I had thought to photograph the pectoral of first fish using the Leica scope.

Ugh. Oh well. Again, wait for them to grow.

Cheers, Eric

Re: New group of 6 Microglanis iheringi... or are they?

Posted: 19 Jan 2021, 20:32
by bekateen
More pics from today, of two more (different) fish. First, a photo of a small fish, the photo which I took while the fish rested at a vertical angle in a shadow, thus revealing better the anterior serrations on the pectoral spine.
small yellow specimen, revealing anterior edge serrations
small yellow specimen, revealing anterior edge serrations
This still presents with a "closest match" for spine morphology to , although my fish are not that. Conversely, I could still envision my spines matching that of , if you allow that the old drawing is not accurate to some degree. One other small fish I tried to photograph today would not sit still long enough for photos, so I got none from it. I was convinced however that I saw on the anterior edge of the spine of that fish a 2-pointed (both antrorse and retrorse) serration at the transition, however, I have not seen that on any of the five fish I've photographed so far (although in each case, pigmentation clouds the visibility of that serration every time).

After that, photos of the left and right pectoral spines of one of my original group, a large yellow fish about 65mm SL.
large yellow specimen, left pectoral spine
large yellow specimen, left pectoral spine
large yellow specimen, right pectoral spine
large yellow specimen, right pectoral spine
I am probably mistaken, but to me, the anterior serrations on the pectoral spines of this large fish appear to transition from retrorse to antrorse about 1/3-1/2 the way along the spine, vs. at the 2/3 (or so) point (above the 3rd posterior serration from distal end) in the smaller fish I photographed.

Re: New group of 6 Microglanis iheringi... or are they?

Posted: 19 Jan 2021, 23:30
by bekateen
And here are the left and right pectoral spines of one of the 50mm SL fat wood-grained dark females:
Right pectoral spine
Right pectoral spine
Left pectoral spine
Left pectoral spine
I confess I was really expecting to see more difference between the short dark fatties and the long yellow more slender specimens. X_X

Cheers, Eric

Re: New group of 6 Microglanis iheringi... or are they?

Posted: 25 Jan 2021, 20:23
by bekateen
Photo update of all 18 fish from my first two purchases, plus details of my largest male and female from the group of 12 fish I got at the start of October.

Although you can't see much detail, I include the photo of the group of 18 because when I added them to this round, flat bottomed bowl, initially the sand was approximately evenly distributed on the floor. Within minutes it had been pushed to the center by the whirlwind of bumblebees swimming frantically in circles. :))
Group of first 18, swirling sand
Group of first 18, swirling sand

As for the SL values of the fish, I didn't measure any of the fish carefully on arrival in October, other than to note that the largest specimens were over 50mm SL (I had no sense of sexes yet). On Nov 22, I measured the largest presumptive male (same male is photographed here: viewtopic.php?p=327899#p327899); he was "over 65mm SL" then; now, he's about 66 - 67mm SL. He had some initial growth after purchase, and he's definitely continued to gain bulk/weight, but apparently he's added no meaningful length since November.
Largest male
Largest male
Largest male, dorsal view
Largest male, dorsal view
Largest male, dorsal view with scale
Largest male, dorsal view with scale
Largest male, face
Largest male, face

By contrast, all the wood-grained fish (including the female below) were "40-47mm SL" on Nov. 22 (alas, I made no specific reference to their size when I bought them in October). Today, all the wood-grained females are much bigger and about the same size. The largest wood-grained female today is about 56mm SL (estimated from her curved body), and also I suspect she's between doubled and tripled her mass! So maybe the size discrepancy I observed initially between the yellow fish and wood-grained fish was merely a maturity issue; let's see if these females catch up to the big males. And for what it's worth, the female shown here is NOT either of the two females previously photographed here (viewtopic.php?p=327899#p327899) or here (viewtopic.php?p=328327#p328327).
Largest female
Largest female
Largest female, dorsal view
Largest female, dorsal view
Largest female, dorsal view with scale
Largest female, dorsal view with scale
Largest female, face
Largest female, face
Hmmm. Comparing photos of male to female, I see the male has an unmelanized chin, but the female has a melanized chin. I wonder what the other fish look like. I guess I'll need to pay more attention during future photo sessions.

Cheers, Eric

Re: New group of 6 Microglanis iheringi... or are they?

Posted: 25 Jan 2021, 23:13
by bekateen
For curiosity (and fun), here's the November and January images of the male, the images resized to match in length since the real fish hasn't actually grown in length during that time. This guy shows almost no change in color pattern, darkening, etc., in two months. But he has filled out (I'd call it a double chin, but it's more like a double-chest). I guess he's eating well. :-D

Also, with no measurable elongation in two months and with his colors stable, I think it's pretty safe to say this is a full-grown and mature specimen. I'm not ruling out continued growth over time, but I think any additional growth will be at a very slow rate.

Cheers, Eric

Same male, photos taken 2 months apart
Same male, photos taken 2 months apart

Re: New group of 6 Microglanis iheringi... or are they?

Posted: 08 Feb 2021, 18:12
by fishguy1978
A member of another forum requested ideas for small catfish that wouldn't eat tank mates, so I recommended these. Another member chimed in that he had a M.I. try to eat a ~1.5in (37mm?) Piranha. The M.I. had the piranha stuck in its mouth.

Re: New group of 6 Microglanis iheringi... or are they?

Posted: 08 Feb 2021, 21:16
by bekateen
These are definitely not community friendly for anything that can fit in their mouths. My favorite LFS will not stock these in their store tanks because of one bad experience 30 years ago, where they got some Microglanis and put them in a tank with very small tetras, and the next day all the tetras were gone. I had to convince the owner to special order them for me back in Septbember 2020, in order to get my first 6 specimens.

Cheers, Eric

Re: New group of 6 Microglanis iheringi... or are they?

Posted: 08 Feb 2021, 22:29
by fishguy1978
Wow, that is hilarious. Good to know though. I have one and haven't noticed anyone missing yet.

Re: New group of 6 Microglanis iheringi... or are they?

Posted: 08 Feb 2021, 22:33
by bekateen
Fortunately, their mouths aren't very big. But their appetites are. :-D

Re: New group of 6 Microglanis iheringi... or are they?

Posted: 09 Feb 2021, 09:53
by Jools
A lot of their bad press is down to their misidentification with things like or mind you. Relatively speaking they are less predatory - so safe with more fishes than those I mention.

Jools

Re: New group of 6 Microglanis iheringi... or are they?

Posted: 09 Feb 2021, 18:21
by bekateen
Jools wrote: 09 Feb 2021, 09:53A lot of their bad press is down to their misidentification with things like or mind you. Relatively speaking they are less predatory - so safe with more fishes than those I mention.
Indeed yes. I asked my LFS owner if that could have been the case with the bumblebees he received in his shop decades ago. He is convinced his fish were Microglanis. But as per this commercial's narrator (after watching a wise old owl try to lick his way to the TootsieRoll center of a TootsiePop), "The world may never know." :))
Cheers, Eric
P.S., And I confess - I've never gotten to the center of the TootsiePop without biting. :-

Re: New group of 6 Microglanis iheringi... or are they?

Posted: 09 Feb 2021, 19:26
by fishguy1978
=))

Re: New group of 6 Microglanis iheringi... or are they?

Posted: 22 Feb 2021, 19:58
by bekateen
Looking at another relatively recent (2016) publication, it becomes obvious here that the woodgrained Microglanis have also been ID'd as . This is incorrect, but it offers one more view of the history of uncertainty about Microglanis around Colombia and Venezuela. It also explains why the wood-grained fish I bought are being marketed as M. poecilus by the importer and by the wholesaler.

Source: Ortega-Lara A. 2016. Guía Visual de los Principales Peces Ornamentales Continentales de Colombia. Serie Recursos Pesqueros de Colombia – AUNAP. Ortega-Lara A, Puentes V, Barbosa LS, Mojica H, Gómez SM, Polanco-Rengifo O (Eds.). Autoridad Nacional de Acuicultura y Pesca – AUNAP ©. Fundación FUNINDES ©. Santiago de Cali, Colombia. 112 p.

Re: New group of 6 Microglanis iheringi... or are they?

Posted: 24 Feb 2021, 01:55
by bekateen
Today I found one more publication that includes a photo referring to the round-saddled specimens of iheringi-like fish as being Microglanis poecilus.
  • Mariaca Villavicencio, A. L. (2018). Aspectos de ecología trófica de la nutria gigante (Pteronura brasiliensis) y su interacción con la actividad pesquera en la estrella fluvial de Inírida, Guainía-Colombia. Tesis, Maestría en conservación y uso de biodiversidad. https://repository.javeriana.edu.co/handle/10554/34365
labeled as M. poecilus in 2018 paper MariacaVillacicencio.png
The paper is surveying fish in Colombia's "Estrella Fluvial de Inirida" area.
map Fluvial Star of Inirida.png
The photo was included as part of a pictoral key used by workers to ID the fish there, but I do not believe the photo is specifically taken of a fish captured in the region. (1) This same photo appears on FishBase as M. poecilus without remark of its origin beyond "Colombia," and (2) this paper uses other photos from non-Colombian sources, such as a photo from Galvis et al.'s 1997 paper to show Venezuelan Chaetostoma tachiraense although in reality it is C. sovichthys.

Somehow, it's a good feeling to know I'm shaking the tree of literature to find photos, but it's not as helpful when they lack clear provenance (all that is recorded on Fishbase is: 2005-01-09, Colombia, Photo credit: Miguel Landines).

Here's the fishbase photo: https://www.fishbase.se/images/species/Mipoe_u0.jpg
Mipoe_u0.jpg
Cheers, Eric

P.S., I submitted a correction to Fishbase.se, to ask them to remove this photo from M. poecilus. Their other photo is accurate. Hopefully this is corrected soon.

Re: New group of 6 Microglanis iheringi... or are they?

Posted: 24 Feb 2021, 06:59
by bekateen
bekateen wrote: 24 Feb 2021, 01:55P.S., I submitted a correction to Fishbase.se, to ask them to remove this photo from M. poecilus. Their other photo is accurate. Hopefully this is corrected soon.
Wow, FishBase is on the ball! Within hours of my submission, I received emails from two mods there, and they said they've removed the photo in question and placed an appropriate photo in its place. The change will go into effect when the website undergoes its next update. :-)

Tomorrow I'll ask them to remove the pics associated with their Microglanis secundus profile. Those are wrong too (being Batrochoglanis acanthochiroides), and I'll ask them to fix the Distribution to remove Catatumbo from M. secundus.

Cheers, Eric

Re: New group of 6 Microglanis iheringi... or are they?

Posted: 27 Feb 2021, 02:31
by bekateen
Update on the growth of the very small Microglanis I bought on January 8. (Here: viewtopic.php?p=328650#p328650)

The largest fish are nearly 45mm SL and some are getting quite fat. The three I separated for this video are all among the largest (all 42-43mm SL) and are very similar in color pattern, although one has a broken brown bar below the adipose fin.
  • They all have the dark wood-grained base color.
  • They all have a subdorsal brown saddle which is solid or nearly so - I don't recall that being true in the past about all of these, so I suspect as I said elsewhere that the color is filling in as they grow.
  • They all have similar color patterns on the tail - essentially a solid but not too thick dark 3-shaped band through the approximate middle of the tail, followed by a heavily spotted (dark but not sold brown) coloration in the area posterior to the solid dark band. Visually, it looks like two bands following the contour of the tail margin, with the more-posterior band being not as solid. (very visible in the video at the 40-44 sec mark)
  • They all have the peculiar trait of a sold brown mid-body longitudinal line connecting the brown head pigmentation to the brown subdorsal saddle, as shown here: download/file.php?id=26473&mode=view. They are not the only fish in the group with this trait, but they have it very well defined. It's visible in the video at 32 seconds.
As I thought might happen, I suspect the subdorsal saddles that have breaks in them on some fish are filling in as they grow. These might end up solid brown saddles, or nearly so. Likewise, I suspect that the broken subadipose bars on several of these fish are also filling in, reaching towards the brown area above the anal fin. Only time will tell though, so patience is in order.

As as for new developments, I'll be returning to the supply source in about two weeks, and I know they have new shipments. You know I'll be trolling through that tank with a fine tooth comb. If everything they have looks like what I have now, I'll come home empty handed. But if for example, they get more of those leucistic fish (like Erlend's in the Cat-eLog), you can bet your *place-mildly-inappropriate-word-here* I'll be bringing more home with me. \:d/

Cheers, Eric

Direct link to video on YouTube: Microglanis growth update 2021-02-26


Re: New group of 6 Microglanis iheringi... or are they?

Posted: 27 Feb 2021, 08:38
by Jools
Thanks for posting Eric, it's certainly the case that looking at these fishes over a prolonged period will help understand them a bit more. Good fish hunting on your next fish store foray.

Cheers,

Jools

Re: New group of 6 Microglanis iheringi... or are they?

Posted: 06 Mar 2021, 19:46
by bekateen
bekateen wrote: 18 Dec 2020, 21:20
On a whim, I did two things today.
  • Second, I picked out one of my very fat female wood-grained fish and took photos in front of a window for natural lighting, both with and without the overhead fluorecent lighting on.

This female is 50 mm SL. Note that this fish has the pale blemish in the middle of the subdorsal saddle. She also has a brown bridge connecting the subadipose and caudal saddles; I didn't recall having any fish with that feature, but going back to the first post in this thread, I see this picture (fourth picture below). Comparing the contours of the color patterns on this fat female and that fish at time of purchase, it's appears that the fat female in this post is the same fish as in that first photograph! If that's true, then her color pattern really did change with growth (no surprise I suppose, but it's cool to observe)... I need to go back and look at the other specimens. And wow, what a difference food makes! :-D

One other thing about her is that beside the rotund belly, which would indicate female, her genital area surrounding the genital papilla is swollen like a balloon (circled in fifth photo below), in the same way that I observed on my Panaqolus species - there's a visible bump of about 4mm diameter and 1mm height around the genital papilla. I haven't checked the males yet, but I doubt they have that swelling.

Also, keep in mind that these woodgrained fish are my small fish. All the woodgrained fish are about the same size. The yellow-bodied fish were as large as 65mm when I purchased them. I don't know if they've grown since, but maybe? Regarding the possibility that the yellow fish are males and these woodgrained fish are all females, I have woodgrained fish that are thin. That in itself doesn't say much, so I'm waiting to see if any yellow fish plump out like this. So far, one or two of the larger yellow fish are slightly rounded more than others, but none so rotund as these little fish. So the sex dimorphism vs two species is not fully settled yet in my mind.
Turns out, I think I was wrong about this big fat female matching the skinny fish from the day one photographs. Today I randomly pulled out another fat fish and I took a picture, only to discover that it is a much better match for the color pattern of the skinny fish photographed on day one. See for yourself. This female is 55-56mm SL today, meaning the fat females have added another ~5mm since the last photo session on December 18th (about 78 days ago).
Points of comparison
Points of comparison
Today's picture (I think the brigher yellow body is due to lighting; other fish photo'd in sunlight)
Today's picture (I think the brigher yellow body is due to lighting; other fish photo'd in sunlight)
From https://www.planetcatfish.com/forum/viewtopic.php?p=327041#p327041
From https://www.planetcatfish.com/forum/viewtopic.php?p=327041#p327041
https://www.planetcatfish.com/forum/viewtopic.php?p=328327#p328327
https://www.planetcatfish.com/forum/viewtopic.php?p=328327#p328327
They are so big and fat now, I'm just wondering what they're waiting on to spawn. I'll have to start playing with their lighting and water parameters.

Finally, here also is one of the big males. He's got the basic yellow body with postero-ventral edges to his dorsal saddle, but his body is not yellow. It's essentially antique bronze color - no wood grain, no dark spotting, as I see in the mix of fat females. He's still 65mm SL. Hasn't grown at all.
Male
Male
Cheers,
Eric

Re: New group of 6 Microglanis iheringi... or are they?

Posted: 08 Mar 2021, 02:28
by fishguy1978
PXL_20210307_172923684~2.jpg
Just saying hi

Re: New group of 6 Microglanis iheringi... or are they?

Posted: 08 Mar 2021, 02:32
by bekateen
Great cave there!

Re: New group of 6 Microglanis iheringi... or are they?

Posted: 08 Mar 2021, 03:46
by fishguy1978
bekateen wrote: 08 Mar 2021, 02:32 Great cave there!
This is the best cave because it faces a viewing pain. I actually get to see a fish I have owned for a year but always hides.

Re: New group of 6 Microglanis iheringi... or are they?

Posted: 09 Mar 2021, 02:05
by bekateen
Back from "Microglanis-R-Us" b-) . They had a lot (at least 50, probably close to 100) of bumblebees today, but unfortunately all the fish looked like what I already have. Even so, I picked up a select few (14) based on specific characteristics, although I confess a couple were accidental catches and I probably should have put them back:
  1. I was REALLY hoping for the leucistic fish or something resembling , but none were available.
  2. I found 4-5 more specimens which shared that odd trait of an intact brown bridge which splits the pale nuchal band in half mid-sagittally.
  3. I picked up a few fish with the feature of the subdorsal saddle broken along its posterior margin with a pale spot, which is then split in a postero-ventral diagonal line; one of these is large, well over 50 mm SL.
  4. I picked up one or two very large specimens of the classic pale yellow colored "iheringi" pattern, because of their large size (over 60mm SL). I believe all of my current fish with this color pattern are big males. Maybe it's sexually dimorphic trait, but I bought more wild-caught fish of the same size, hoping they might be underfed females with the same bright yellow color pattern.
  5. I picked up a few thin long wood-grained specimens, all over 50mm SL. I'm hoping these will be males, but so far all of my larger wood-grained fish are (I believe) females. Maybe these are just thin females also - time will tell.
  6. I picked up about 4 very small fish (less than or equal to 25mm SL). These are mostly dark woodgrain colored, but some had the broken subdorsal saddles, like a few from my previous purchase of fish. If these small fish are a different species, I wanted to add to that group.
Of all these groups, #1 and #2 are my favs of today's take.

I just put them into QT, a heated 5-gal bucket with a sponge filter. Sadly, all of these fish are heavily infested with ich or something similar, so they're going to get some serious QT meds (Paraguard initially, Nox ich if needed, followed by Prazipro) before I add them in with the other groups. I've had zero deaths among the first 44 specimens I purchased, so I'm hoping these will do well in QT and recover fully with no deaths.

In total, I'm up to 58 bumblebees. If the variation in body size (~65mm SL, ~55mm SL, or <40mm SL), in body base color (yellow, antique bronze, dark with spots, or wood-grained), in the shape, size and features of the subdorsal saddle and the sub-adipose bands, or in the presence/absence of the peculiar mid-sagittal bridge across the pale nuchal band are significant species traits, I suspect I have 4 species (or more) in this group. Time will tell.

Cheers, Eric

Here's a very short video of them as soon as I got them home, before QT:
Direct link to video on YouTube: 14 more Microglanis bumblebee catfishes

Re: New group of 6 Microglanis iheringi... or are they?

Posted: 09 Mar 2021, 12:22
by Jools
Cool! That big high-contrast one looks superb. Look forward, optimistally, to a pic!

Cheers,



Jools