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This summer I have the great pleasure of working near Iquitos, Peru at the Amazon Research Center for Ornamental Fishes.

I've had one fishing expedition so far, that being along creeks of the Rio Itaya. Here's some of what we found:

More examples:

Look great, do you have IDs for all of them? I see 4 (assuming 2 spp. of Ancistrus) that I am not sure of.

Jools

Very nice! Not sure on the first Ancistrus but second one looks like a L349 to me??

Take care,
Chuck

Jools wrote: ↑11 Jul 2021, 09:08Look great, do you have IDs for all of them? I see 4 (assuming 2 spp. of Ancistrus) that I am not sure of.

Jools

Sorry, was in a rush last night. Went back and edited post to add names. Yes definitely 2 spp. of Ancistrus. The one that looks more like a common had a slightly more defined color pattern than I would see in an adult "common bn" from a pet store, and it has a weak red/ brown overall tint. I have no clue which species it is yet because I haven't investigated what BNs live here yet.

stuby wrote: ↑11 Jul 2021, 10:19Very nice! Not sure on the first Ancistrus but second one looks like a L349 to me??

Take care,
Chuck

My thought also, yes. But I'm not 100% sure.

Maybe too?

Jools

Jools wrote: ↑11 Jul 2021, 16:34Maybe

Hypoptopoma sp(2)

too?

Jools

I don't know. @The.Dark.One suggested to me maybe .

This fish certainly needs a closer look.

Cheers, Eric

As for the more "common" looking Ancistrus above, I see on GBIF.org that the only identified species they have on record in the immediate vicinity of Iquitos are and . A. malacops was described from the Rio Ampyacu. I have little idea what it should look like, but if my fish is a described species, then maybe it's A. malacops. It certainly isn't A. hoplogenys.

Also described from the Rio Ampyacu are and .

Cheers,
Eric

Met today with a couple of local fishermen who had just come back in from fishing the Nanay along Iquitos. From that catch I got four tiny Microglanis which superficially resemble the Microglanis I purchased two days ago and three more Batrochoglanis, apparently belonging to two species.

Here's one of the four Microglanis: Here are the four Batrochoglanis (3 speckled on right, the tiny black fish to left): The smallest of the Batrochoglanis resembles and the larger has been collected in this area by Mark Sabaj, who ID'd it as . But Iquitos being so far from type locality of both of these, is it really plausible that these are the same species as true B. raninus and B. villosus? I know both are considered "widespread," but I would suspect they are species groups rather than two species. I'm looking now for any recent genetic workup on these species using geographically distinct populations.

I've also been told by @The.Dark.One that Peruvian "raninus" do not approach the max SL that Coastal Brazilian forms reach...

Are these both undescribed species? Or any info on size differences between Peruvian populations vs. Expected for typical specimens from their respective type localities? Thanks in advance.

Cheers, Eric

@Yellowcat Kirk, you'd be interested in seeing these Pseudopims, maybe help with ID.

More of the same while fishing another creek along the Itaya.

More , another Heptapterid (?), two more , two Otocinclus (can anyone ID these? My best guess is ), plus a couple of Anguilla, knife fish and tetras. Best part of this was the large size (95mm SL) of the female Rineloricaria lanceolata caught by Edgard Leonardo Davila Panduro. He also caught some much larger (up to 36mm SL) Pariolius armillatus here, along with a few small characids that looked a little like color mimics of the Pariolius. Behaviorally, these little fish also tried to dig in the photo tank, much like the Pariolius, which prefer to hide along clay and sand shores among the leaf litter. I wonder if the tetras do the same.

We also caught tiny (I'd guess just past yolk stage) Ancistrus sp. and a very small 1") Farlowella.

... still no Microglanis caught by us though, and no more wood cats.

Cheers, Eric

Hi Eric,
Looks like you are having a wonderful fish-time!

I haven't pulled out the paper as of yet but the caudal pattern on the first Otocinclus certainly brings to mind the species O. batmani.

Lee

Hi Lee,

Thanks, yes. O. batmani is my first guess too.

Cheers, Eric

I noted with great interest the batrochglanis specimens found in Iquitos from the Rio Nanay. Having kept several species of pseudopimelodus and batrochoglanis that came from Peru, many shown in the Cat-eLog and of the focus of my collection of South American species. The batrochoglanis cf. villosus shown, although juvenile specimens, are very similar to my most recent aquisition of what seems to be an adult specimen @ 9" TL. Notable is the speckled one that by virtue of markings closely resembles the pattern found on some b. transmontanus from Colombia in the past. My fish has dark spotting too but hard to see as it's hard to see the spots as it's on an almost black background to begin with. When I received the fish the colouration was basically black with almost white markings and has since changed to brown with pale yellow marking. It's not news that colouration and markings are a much less important means to I.D. than other morphological differences. Photo's showing color changes:
Due to my keen interest in these species I recently made contact with Dr. Oscar Shibatta via e-mail and sent many of my photos of pseudopimolodidae and batrochoglanis specifically including my newer fish shown above. For perhaps obvious reasons I declined to ask him to identify any fish which would seem presumptive on my part to ask of the most authoritative scientist on these species. He did find of interest my observations on their ethology or behaviors as he doesn't keep fish in aquariums as his focus is on taxonomy. I proposed the theory that there may be undescribed species of batrochoglanis that may exist in the Peru and he replied: "I agree with your assumption that there still are new species in the Peruvian Amazon. Still due to the rarity of the species, it isn't easy to get representative samples to describe them. The development of molecular analyses has aided in this task but morphological analysis will always be necessary for taxonomical work." Certainly finding any imported specimens here in the U.S. is nearly impossible, quite rare, sometimes taking years to find just one. I bought a new 50G aquarium just because I found the one for sale! So Eric, bring some back, if I had room for more (they must be kept alone, hating conspecifics) I'd walk from L.A. to Stockton to get more! Unique too, is that my latest one, compared to past versions of b. cf. villosus that were strictly piscivorous, this one eats most anything offered, aside from it's morphology is slightly different in some subtle ways, possibly due to undetermined sexual dimorphism of past specimens. It seems likely that many species of Peruvian fish imported here may have originated from Iquitos and rivers in the region. The arrangement of my photos not what was intended, oh well..

yellowcat wrote: ↑15 Jul 2021, 19:29So Eric, bring some back, if I had room for more (they must be kept alone, hating conspecifics) I'd walk from L.A. to Stockton to get more!

They have to be kept alone?!? Crap! I wanted to set up a breeding group of these three fish (or more if I got them)!

@yellowcat, I am torn. If they are a new species worthy of description, then having only 3 specimens would likely get them thrown in formalin. That said, they are juveniles and maybe they need to grow out. Seriously, I would like to catch more, and if they are undescribed then work with some expert to help describe them. Joking aside, I was contemplating keeping a few together, but your experience tells me that's a bad idea.

I'll keep this thread informed if I have updates.

Cheers, Eric

Hey Eric, It has been my experience with cephalosilirus that they will not coexist peacefully with any congener of pseudopimelodidae and adult batrochoglanis will not tolerate conspecifics. My first question to my supplier as he had 2 specimens was are they in the same tank? His reply was yes but with a divider and even then they were trying to get at each other! Generally batrochoglanis can be kept with other fish species and other catfish species without issues other than their piscivorous appetite, just not their own kind.There are exceptions with juveniles of these species as they will co-exist without problems for a time (the case with 3 juvenile b. transmontanus) but later will likely become territorial and develop a hierarchy leading to potential aggression? I too thought it would be great to have a male and female, more to note their morphological differences (assuming with 2 to choose from that would be so) as I was willing to buy both, ex$pensive as they are but because they are so very rare. To be the first on the planet to breed them in captivity would be an amazing feat of course, well beyond my capabilities and lack of expertise for sure. That said, another problem would be that they are rather slow growing, a few years from juvenile to adult and unknown size for sexual maturity. I would think that one could forestall potential aggression among juveniles if they cohabit in a large enough tank with enough individual hiding spots like driftwood shady spots and the like, as I've found works with some other catfish species. Being so rare and possibly unidentified it would nice to at least bring back and study a few of them in captivity as long as possible. My experiences with these fishes is admittedly rather limited, all considered, more needs to be learned about them from scientific sources as well as those who enjoy keeping the rarest of species. I realize that as a scientist you have priorities and protocols and can't keep or bring back some of the amazing specimens you discover in the field as much as I assume you would like to...

@yellowcat, thanks for the additional perspective. I plan to ship the Batrochoglanis home, but they won't be shipped till Sept 7. I have until then to figure out what I'll do with them.

Cheers, Eric

Great, I applaud your decision! To me it would be such a shame for those little beauties to end up in formalin. I've noticed the you sell your amazing list of captive bred pleco's and Cory's. Should you at some point consider selling the batrochoglanis', there is a market for them with commensurate prices due to their obscurity and rarity I can assure you. I for one have gone to great lengths to acquire rare fish, contacting importers and wholesalers convincing them to sell to my LFS and paying for a batch of fish and shipping at my own risk and in the end, turned out to be well worth the effort. Should any ever become available in the future, kindly keep me in mind...
In the meantime enjoy your time in Iquitos. I was previously acquainted with an ichthyologist whose speciality is stingrays, he had great stories about times spent in Iquitos... Cheers, Kirk

Thank you, I sure will.

Cheers, Eric

Yesterday afternoon was another fishing opportunity. This time we were in a shallow tributary of the Nanay (vs. our previous trips along the Itaya). We caught a LOT of Loricariinae, one massive Ancistrus (SL about 12.5cm) male and two medium-sized (about 10cm or more SL) (sadly, I think they're both female)! Plus four doradids (hopefully Amblydoras, possibly ?), and a tiny banjo catfish, about 1-2cm long.

Among our catch, about a dozen , about an equal number of huge , about 6 Rineloricaria, which superficially resemble but I showed them to Norman Behr and he says no way... he thinks undescribed species..., about a half dozen medium-large hypoptopomatines, and a single fish that looks like a small (but sadly, that died overnight).

Still no .

Cheers, Eric

I think you are right with that Ambylodoras being A. nauticus. Other known specie from Iquitos is A. monitor but I think they have less markings than nauticus.

? Collected these myself near where you are. Scary to think that was 22 years ago...

Jools

Jools wrote: ↑17 Jul 2021, 09:04

Rineloricaria sp`loreto`

? Collected these myself near where you are. Scary to think that was 22 years ago...

Jools

I suggested that to Norman. Was waiting for his reply.

When you collected them, did you keep them? How big did they reach?

Cheers. Eric

No new fishing today, but I will add that a man named Carlos Chuquipiondo Guardia, who manages the ARCOF grounds and lives nearby, has a few aquaculture ponds. Among his stock is an interesting and nicely patterned species of Loricariichthys, possibly .

Too bad they grow so big. It would be nice to raise another different Loricariinae and try to breed it in an aquarium.

Cheers, Eric

bekateen wrote: ↑17 Jul 2021, 12:09When you collected them, did you keep them? How big did they reach?

Quite large, 18cm Sl or thereabouts - distinctive when viewed from above.

Jools

Jools wrote: ↑18 Jul 2021, 18:19Quite large, 18cm Sl or thereabouts - distinctive when viewed from above.

Jools

Thanks for the info. Well, dang, why can't they be happy little 10cm SL whiptails? Crappo-profundo. Now I have to figure out where to house them if they get that large.

I do wish they looked more distinctive compared to . There's not a lot of difference, although these sp. Loreto do have a nice 5-spot rosette (with a 6th spot in the center) beneath each eye, which I believe is absent from all my eigenmanni. I'll try to share a photo of the rosette.

Eric wrote:Thanks for the info. Well, dang, why can't they be happy little 10cm SL whiptails? Crappo-profundo. Now I have to figure out where to house them if they get that large.

That said, 18cm SL is about the same SL as the lone presumptive I caught (which died) and also the same as the Loricariichthys (possibly ) being bred in the ponds across the street from me here. I'm going back to the same catch location tonight so I might get more Limatulichthys, so if I'm going to set up a tank for 18cm whips, should I go all in for 2 or 3 of these species?... err, probably not, as finding adequate housing for more than one of these will prove to be a challenge. And my guess is if I had 6 adults of each in one tank, they would need a big tank footprint.

At least the we caught stop around 13-14cm SL.

Cheers, Eric

We returned to the same spot off the Nanay this afternoon. Hugely successful... but you'll have to wait till at least tomorrow for pictures. Among today's catch:

• Our first Microglanis: 6
  Microglanis aff_poecilus
  .
• one big
  Batrochoglanis
  , about 8-10cm SL and one or two smaller individuals.
• one big
  Limatulichthys griseus
  (also about 8-10 cm SL) and 2 or 3 smaller individuals.
• two small
  Tetranematichthys wallacei
  .
• one really big (3"-4") leaf fish, and it was actually green (all the ones I've seen before were brown).
• Two Corydoras species,
  Corydoras(Ln8sc4) agassizii
  and
  Corydoras(ln9) atropersonatus
  . (they were swimming close to each other and we caught them in the same seine sweep. We released all those).
• several more Ancistrus and Farlowella (we released all those).
• several pike cichlids of decent size (10+cm) along with some Cichlasoma and Apistogramma (we released most of those).
• A few small wolf fish (we released all those).
• lots of different knife fish and tetras, and some 3" headstander type fish (we released all those).

I couldn't be happier with the Microglanis, although for science all six of these need to go into formalin. So actually I could be happier if we get a chance to collect some to bring home alive to raise and breed!

Cheers, Eric

P.S. we were only about 100 meters upstream from where we caught all the Hemiodontichthys acipenserinus a few days ago, and we saw none tonight. I think if the seine hadn't torn, we would have caught more.

@yellowcat, I'm sending you a PM.

Cheers, Eric

This is gonna hurt to read...

I said we found one big speckled Batrochoglanis. I measured it today at 108.6 mm SL. Because it's the only large specimen we caught, it had to go into formalin as a museum specimen, with a fin clip for DNA.

Is it really just , all the way out here in Iquitos? Or should it be called B. aff. villosus? Maybe we'll help figure that out.

I feel really bad pickling this fish. It's beautiful!

bekateen wrote: ↑19 Jul 2021, 02:55 We returned to the same spot off the Nanay this afternoon. Hugely successful... but you'll have to wait till at least tomorrow for pictures. Among today's catch:

• one big
  Limatulichthys griseus
  (also about 8-10 cm SL) and 2 or 3 smaller individuals.

Wow, did I underestimate this! 15.06 cm SL!