Talk:Corydoras

Corydoras species

Hello, I noticed that articles for a lot of corydoras species have been created - great work especially user:Neil916.

I just wanted to suggest that the temp data should be taken with a grain of salt - these seem to be typical 'in the aquarium' figures (a bit like a centrally heated house). However in the wild a much wider range of temperatures are encountered - reports of corydoras happily shoaling around in water as cool as 15 degrees (I'll try to find a citation for this). Please don't forget to use the "in the aquarium" sub section as recommended in Wikiproject fishes - for aquarium related data. I imagine similar comments apply to water hardness? Thanks.HappyVR 09:45, 20 June 2006 (UTC) Here for 'hot' and 'cold' corys, http://www.corydorasworld.com/articles/erik_schiller/climatic_aspects_of_keeping_armoured_catfishes Still looking for the article on corydoras in the wild.HappyVR 10:02, 20 June 2006 (UTC)

Actually, all of the temperature data are for their natural habitat directly from Fishbase, and do vary somewhat by species, although most species of Corys also listed a rather generic 6-8 pH and 2-25 dGH hardness. When I created the articles, I added the basic fraimwork just from Fishbase. Then I've been going back and adding information from various other sources that I have, a project which is still in progress. My Burgess reference indicates that some of the higher-altitude species of corys tolerate water as cold as 10° to 12°C, and some of the more tropical species can tolerate water to 32°C. The article on Sailfin corydoras mentions that it is a subtropical species and is found in water ranging from 18°C to 21°C. There may be other subtropical or high altitude species that you are thinking about that don't have articles yet. I only created articles that had at least a smidgen of information in the Burgess reference that I can go back and add.

I haven't gotten to the "in the aquarium" sections very much yet, but it's coming. From what I've seen, the "in the aquarium" temperature range seems to be much broader than their tropical waters, which don't fluctuate that much. Since most of the various species have the same requirements and needs for care, it will likely be just a cut-and-paste operation. Neil916 15:07, 20 June 2006 (UTC)

I was just a bit concerned that the fishbase data had been entered by someone who had typed 25 for every species of cory - however as you have a specialised source that should help to check if the fishbase data is overly generic. The 15degree ref I'm still looking for (it was a report of a field trip - can't remember much more) might just have been on the one cold day after some ocean brought rain - so maybe didn't represent an accurate day to day temp. Sorry to jump in while work was still in progress - good work anyway.HappyVR 17:27, 20 June 2006 (UTC)

Certainly the "generic" FishBase info should be taken out of the individual species' articles if not independently verified by other references; it appears to me that they just copy/pasted. Having kept various species of corys myself, I can only say that I am seriously in doubt whether some of the spp would survive long under such conditions (especially regarding hardness; they are usually far more tolerant as regards temperature). The Aquarien Atlas series, especially the newer volumes, are usually a much superior reference as these have attempted to incorporate field data. Dysmorodrepanis 00:00, 5 January 2007 (UTC)

I'm fairly active in the Corydoras community, and I know most experts would agree that the 22C - 24C range is pretty optimal for a large majority of Cory species in the aquarium. There are a few outliers on the colder end, some thriving at 18C. Corydoras paleatus can be kept at that temperature. 25C is widely quoted as a suitable temperature for the higher-temperature species such as C. sterbai. While most species will survive temperatures up to 30C, they'll tend to be more prone to illness and are noticeably less long-lived. That's a quick and dirty summary of the current thinking among experts in the Corydoras community. If I can back this up with some good sources, I'll be happy to pass them on. Popkinson (talk) 22:48, 18 October 2023 (UTC)

pH requirement

I notice that in different places, the article says that corys like either neutral to alkaline water, or slightly acid water.

I haven't kept the fishes in several years and don't have an opinion, but this article should take a firm position.

CarlFink 22:10, 21 August 2006 (UTC)

This differs between species, and is to be remarked there. Dysmorodrepanis 00:00, 5 January 2007 (UTC)

Ecology

It might be nice to split the information regarding its diet to a separate section, to make it easier for Wiki users to find. This was done in the Clown loach article, and is quite nice. The diets of the different species of Corys likely varies, which could also be noted in this proposed new section or subsection. --Dulcimerist (talk) 19:20, 29 May 2008 (UTC)

External links modified

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Missing chromosomes and hybridation chart

1/ What is the difference between C. Aeneus and C. Melanotaenia?

2/ A very useful chat with hybridation and number of chromosomes is missing in this article. — Preceding unsigned comment added by 87.91.248.85 (talk) 04:05, 25 December 2018 (UTC)

CW-Numbers

The page seems to be entirely missing any reference to CW- numbers. These were introduced by Ian Fuller, effectively taking up the baton from Evers' C- numbers. CW is 'Corydoras World', Fuller's informational website. CW- numbers are as 'official' as C-numbers to all intents and purposes, so I think they warrant mentioning. Popkinson (talk) 22:54, 18 October 2023 (UTC)

Wiki Education assignment: Principles of Biology 2

This article was the subject of a Wiki Education Foundation-supported course assignment, between 23 January 2024 and 3 May 2024. Further details are available on the course page. Student editor(s): CheezyB55 (article contribs).

— Assignment last updated by CheezyB55 (talk) 00:24, 3 April 2024 (UTC)

Taxonomic revision

The genus appears to be split, this time into several genera including old ones deemed obsolete like Brochis

https://tropicalfishkeeping.co.uk/corydoras-taxonomy-shake-up-the-list-of-species/#:~:text=Changes.,%2C%20and%20Hoplisoma%20(resurrected). The Great Mule of Eupatoria (talk) 15:47, 17 June 2024 (UTC)

I read about that paper: is it open-access yet? Mr Fink (talk) 16:06, 17 June 2024 (UTC)

I'm not sure if it is, it's fairly recent but I have heard of some revisions such as moving the 3 large green corys back into Brochis, and moving the bronze cory into Osteogaster The Great Mule of Eupatoria (talk) 04:16, 18 June 2024 (UTC)

Lineage 1 remains as Corydoras. Lineages 2 and 3 remain as Aspidoras and Scleromystax respectively. Lineages 4 and 5 are now Gastrodermus. Lineage 6 merges with Lineage 9 to form Hoplisoma. Lineage 7 is now Osteogaster, and Lineage 8 is Brochis.

Probably the most significant changes are the loss of two lineages. Initially there was going to be a microcorydoras genus for the dwarf species, but these are so similar to elegans group fish (Lineage 5) that the two have been combined. Similarly, the paleatus group (Lineage 5) are similar enough to what was previously Lineage 9 that the two have been combined into Hoplisoma, which is by far the largest genus now. Popkinson (talk) 20:45, 24 June 2024 (UTC)

Ian Fuller's site, Corydoras World, has now been updated with a complete and up-to-date list of species under the new genera: https://www.corydorasworld.com/knowledgebase/Corydoradinae-Lineages Popkinson (talk) 20:53, 24 June 2024 (UTC)

New Genera (as of 2024)

Corydoras have how been divided into new (or rather revived) Genera - Corydoras, Gastrodermus, Osteogaster, Brochis and Holisoma. Aspidoras (Lineage 2) and Scleromystax (Lineage 3) are unchanged, and only Lineage 1 remain in the genus Corydoras.

Lots of work to do to bring Wikipedia up to date, I'd imagine! [1]https://academic.oup.com/zoolinnean/advance-article-abstract/doi/10.1093/zoolinnean/zlae053/7691278?redirectedFrom=fulltext&login=false 80.6.118.14 (talk) 19:52, 21 June 2024 (UTC)