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coelacanth

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Viewing 15 posts - 1 through 15 (of 466 total)
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  • in reply to: Anyone got Poll 1967? #355114

    coelacanth
    Participant

    OK, type locality of D. (now A.) bifasciatus is a long way upstream (and up a trib.) from what, as far as I know, were the main collecting areas for most of the past couple of decades, but for a river like this that may not mean much when you consider the distributions of some of possible analogues from the Neotropics like Moenkhausia collettii, dichroura, lepidura etc.
    Similarly, the type locality for A. caudalis is a long way downstream from these same areas, same comments on distribution apply.

    However, if you look at the descriptions and figures of both A. caudalis and D. bifasciatus, and the preserved specimens of same, I know which I think is closest (although with some differences) to the “caudalis” of the aquatic trade.
    It’s a stretch to believe that all the specimens Boulenger had to work with had unusually deep bodies (maybe through age or a particular regional variation), and that due to preservation all indicators of the distinctive tail pattern had been removed (but then why the specific mention of “reddish, with a silvery lateral band”?).

    In the paper by Mbimbi and Stiassny: A new Alestopetersius (Characiformes: Alestidae) from the Kwilu River (Kasai basin) of central Africa; with a phylogeny for the genus and synonymy of Duboisialestes, there’s an image of a preserved fish labelled A. caudalis which again, doesn’t look like the hobby “caudalis”. There’s also an image of a fish labelled D. bifasciatus, but annoyingly the caudal is damaged (although in general form it looks “right”).

    All very confusing!

    in reply to: Anyone got Poll 1967? #355108

    coelacanth
    Participant

    I’ve only seen the digital edition, but I’ve tagged you in on FB to a thread relating to this.

    in reply to: Anyone got Poll 1967? #355105

    coelacanth
    Participant

    This has been rattling round my tiny mind since we had a go at unravelling the various “Moon Tetras”, and then re-emerged while chatting with Oliver Lucanus about where some new sexeh tetras may be located. There’s always a risk of “Emperor’s New Clothes” in challenging nomenclature that has been accepted in the hobby for a long time, but I think it’s very possible that the “caudalis” of the hobby is not the fish that Boulenger described.

    Hans Evers has sent me another paper on the Lefini but it’s at work and I’ve haven’t had a chance to look at it properly, need to drop it onto my Galaxy so I can pick at bits when and as I have the chance.

    in reply to: Anyone got Poll 1967? #355098

    coelacanth
    Participant

    The figure in Boulenger (drawing of the type as Petersius caudalis) here http://www.biodiversitylibrary.org/item/36773#page/256/mode/1up shows a fish with a shape nothing like the “caudalis” of the aquarium hobby. Additionally, the colour is described as “reddish, with a silvery lateral band, which becomes blackish on the caudal peduncle and extends as a black band on the caudal fin”, again, nothing like the fish in the hobby and no mention of the distinctive caudal fin patterning (which you would have thought would be noted, given that other colours are mentioned). It has to be assumed that as Boulenger originally described the fish and this is also his work, he was happy with the figure and discussion of the species in the catalogue.
    Some of the syntypes for caudalis can be seen here http://research.amnh.org/vz/ichthyology/congo/ale_typesg/index.html, again, to me these do not look like the hobby “caudalis”. Note there is no sign of any pale stripes either side of the dark central rays to the caudal fins in any of these specimens, but note the deep body form (which agrees with the figure in Boulenger).
    If you look at the holotype for Duboisialestes (now Alestopetersius) bifasciatus on the same page, that shows a fish with a caudal displaying a dark central stripe, pale stripes to either side, then darker lobes, which is superficially like the hobby “caudalis” (but not looked any more closely, not had the time).
    To confuse the situation. there are two fish preserved here http://research.amnh.org/vz/ichthyology/congo/ale_preservedg/index.html listed as caudalis. Not sure what to make of those TBH.
    The latest edition of Amazonas magazine has an article featuring the “real” A. caudalis (a fish which does agree superficially in form and colour with the description by Boulenger).
    The hobby “caudalis” is obviously very numerous and easy to collect given the frequency with which it appears in imports, so it has to be assumed that it’s described.
    Not sure when the name “caudalis” was attached to this form, wouldn’t surprise me if it was another Baenschism as with the various Moon Tetras.
    So, I’d like to read the original description of D. bifasciatus by Poll to see what is said about the caudal fin.

    in reply to: Nitrate levels up.. #355041

    coelacanth
    Participant

    I wish everyone maintained their fish at such low levels. I often joke that when I started fishkeeping, Nitrate wasn’t even discussed as an issue for freshwater, yet my fish grew and were healthy. Seemed that it only started to be a problem once we read about it…
    I would be extremely happy with those test results, so don’t worry about it, let your fish tell you if you’re doing it right. Keeping fish is as much art as it is science, but it is meant to be a pleasure. There was a period where I was testing each day, pH, dissolved oxygen, Nitrate, and fretting if any of them varied from what exactly what I wanted. The fish were probably stressed far more by my tinkering than if I’d relaxed, watched them and missed a water change every now and then.

    in reply to: Small non-riverine Asian cats #354938

    coelacanth
    Participant

    Great little active shoaling fish, I prefer moolenburghae visually. Pangasius in miniature, more active than glass cats, less frantic than the African Pareutropius.

    in reply to: Small non-riverine Asian cats #354934

    coelacanth
    Participant

    Gagata are very much a rheophile. Pseudeutropius seem to be OK with limited flow, smaller clariids (need to be sure of ID on these!), smaller bagrids like Mystus carcius, Batasio, Pseudomystus, Rama, Nanobagrus. I’ve seen all of these available in the UK, may need a trip to Denmark to somewhere like Neonfisken for yourself, or down to Germany.

    in reply to: Questions on Retroculus #354926

    coelacanth
    Participant

    They do sift sand but it’s “different” to how Geos do it, more of a peck or a lunge. I suppose it would depend on the substrate. They’re kinda “bonefishy”, if you’ve ever seen film of those feeding it reminds me of that.

    in reply to: Questions on Retroculus #354923

    coelacanth
    Participant

    I had them over 15 years ago, grew them to a decent size and passed them on.
    Warm, clean water with high oxygen levels, they’re prone to white spot, had to treat them for Camallanus as well. As with most Geos (and most fish really), lots of small meals better for digestion and growth than one of two large feedings. Had no issues with HIH, I found them easy to care for, not overtly aggressive (although they were only subadults).
    The linear flow pumps are ideal for these fish, when you see how easily they can sit in high turnover you realise why they’re shaped how they are.
    People seen to be having good results feeding them with Repashy foods.

    in reply to: Paper wanted #354921

    coelacanth
    Participant

    I really can’t remember, it was a post-work “first of several cups of tea and think about food/going fishing/having a beer” where I’m wondering what to do with the evening when I spotted it. May even be an old paper that someone posted up on a group out of interest.
    It’ll show up again I’m sure…

    in reply to: Paper wanted #354916

    coelacanth
    Participant

    I don’t think it was, I remember seeing the title and thinking “ah, so they’re little chatterboxes as well!”. I keep wandering back to it being a Betta in my head, but that could be completely wrong.

    in reply to: 140 gallon/560 liter paludarium #354905

    coelacanth
    Participant

    Ma aussi, s’il vous plait.

    in reply to: 140 gallon/560 liter paludarium #354871

    coelacanth
    Participant

    That’s a great bit of filming, gets you wondering just how many other fish can do this.

    in reply to: Help: Neon Tetras for Breeding #354853

    coelacanth
    Participant

    If permitted under the terms of the project, switch to Flame tetras, they’re generaly sold at mature sizes and are extremely easy to spawn and raise. Just separate the females for a few days, feed both sexes well then give them java moss or mops and away they’ll go.

    in reply to: Lab Diet for Danios #354751

    coelacanth
    Participant

    We rate ZM as I have said, but we have had little experiments a few times with fry of different spp., splitting batches and just using prepared fry foods for one lot, the other using combined foods. The difference in growth and survival was dramatic.
    Obviously in the ZF breeding labs they want control and consistency.

Viewing 15 posts - 1 through 15 (of 466 total)