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A question to cory experts
June 15, 2013
3:13 pm
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mikev
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Slightly weird question... Hopefully someone can figure out what I just bred... yeah, one is not supposed to have two species in one tank, but I was not trying to breed them now, it just happened. I have not bred either species or anything closely related before so I cannot guess by the egg size or placement, but perhaps someone did and has a clue.

Species 1: c.elegans (or closely related, was sold as c.napoensis, but is likely not): http://www.franksaquarium.com/images/catfish/corydoras_napoensis.jpgImage Enlarger


Species 2: C089 http://www.aquabid.com/uploads/fwcatfishc1352343162.jpgImage Enlarger

Eggs are small, smaller than c.aeneus, ditto for fry, eggs were placed on glass (plants/mop ignored) in a fashion similar to c.aeneus. Hatch time seems short, 3 days.

Guesses would be very much appreciated, otherwise it is two months of raising donno-what. :( Or, if not guesses, any phrase on how elegans-type cories breed (egg size/positioning) would help.

June 15, 2013
6:24 pm
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torso
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Hi Mikev

C.elegans: all species in the elegans-group - exept CW33 - have dark dorsal fin markings. CW33 without dorsal fin markings seems not the right guess.

C089: eggs hatch in 3-4 days, 1.2 mm vs C. aeneus 1.6 mm.

all infos out of I.Fullers "Breeding ..."

I couldn´t find a match for species 1 yet. Do you have more pics?

Cheers Charles

June 15, 2013
6:37 pm
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Graham Ramsay
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Pic 1 could be bilineatus. When I spawned those all the eggs were placed in plants near to the surface. All eggs and fry from the elegans species group are tiny.

June 15, 2013
7:28 pm
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mikev
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Thanks a lot you two!

I think this makes c089 the likely answer... yes, 3/4 of c.aeneus size is about right. Ii'm a bit surprised since the fish is young, 8-9 mo of age, and does not look breedable.. but all the eggs came out fertile. 7 so far, should be more...hope I can feed them, the fry is actually the smallest cory fry I had so far.

I'll try to take a better photo, here is a lousy one from before http://www.micropress-inc.com/fishpic/cory-norb1.jpgImage Enlarger

. When I tried to ID them, c.bileneatus was the 2nd possibility mentioned.

June 17, 2013
6:08 am
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kim m
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Eggs and fry would be similar (until the fry reach a certain age of course). I have bred quite a few "elegans-group" soecies and they are very similar with a few exceptions but 89 and napoensis wouls be difficult to tell apart from egg size or placement.

The first pic coul dshow napoensis or bilineatus, but these napoensis/bilineatus/San Juan and whatever they are imported as are very difficult to tell apart unless you know at least wich country they originated from. The river would make it even better ;)

---------------------------- Best regards, Kim Kastberg
June 17, 2013
3:06 pm
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mikev
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OK...wait and see then.

One more question if I may: how safe is to raise two types of cory fry together? Same age, different initial size... specifically the fry from this thread which is kind of small with c.similis that hatched yesterday and are large.
(I'm really pressed for space right now :( ).

June 18, 2013
12:35 pm
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kim m
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There's only really one answer; try! It is differemt from species to species how well the fry do together with fry form other species. Some won't make it and some will benefit from the company.

Generally weith "elegans-group" species I remove the adults and leave the fry in the spawning tank alone because the number of eggs/fry from these species is often very large.

---------------------------- Best regards, Kim Kastberg
June 18, 2013
3:21 pm
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mikev
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Thanks, Kim,

I'll see what I can do -- I don't like the sound of "try". Way too much fry lately and I'm at a point where I have no place to stick another 2.5g tank into the fishroom :(

June 23, 2013
4:38 am
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mikev
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Actually I just realized how stupid was the original question. C089 does not look like elegans at all, but per phylogeny classification it is in the elegans group all right.... naturally eggs and fry would be similar. Need to wait for them to grow up.

Totally offtopic:

here is something interesting... is this cory familiar to you?...seems as black as c.schultzei black, and not an AS... the question is how breedable it is..

June 23, 2013
9:25 am
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kim m
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I can't see a picture? :)

---------------------------- Best regards, Kim Kastberg
June 23, 2013
2:38 pm
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mikev
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click on the link above for description and photo, or here it is again: http://www.planetcatfish.com/c.....m/cotm.php and the photo separately:

http://www.aquabid.com/uploads/fwcatfishc1372622639.jpgImage Enlarger

August 9, 2013
8:14 pm
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mikev
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Any advice you can offer on raising these c089/elegans fry?
The first spawn is doing fine, albeit growth is very slow comparing to other cories... but I lost all fry from the subsequent spawns, all within 1-2 days of them consuming their yolk sac. I had one more spawn yesterday, maybe you can suggest something I can do?

and one more thing: anything special to know about c.hastatus fry? I have a few and more eggs to hatch...so far the fry seems to be surviving fine, but perhaps there is something special to be aware of? (I sure want to raise them given that the fish became uncommon lately).

Thank you!

August 10, 2013
7:05 am
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kim m
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Mike, in general when dealing with elegans-group fish I remove the adults from the breeding tank and let the fry grow up there, simply because the amount of eggs are so big that it is easier to remove the adults :)
Most of these are very slow growing.

I know the fish you link to...Scleromystax is one if my favourite genuses and I keep/have kept and bred 8 species and at the moment I am breeding lacerdai. they breed quite readily. I kkep a group in 100% rainwater at around 22 C. and good current. Eggs are placed typically on the front glass and I leave them for 3 days before collecting them into a net I hang in a breederbox. I never touch Scleromystax eggs with my fingers as they seem extremely sensistive compared to mormal Coryeggs. The fry are released back in the adults tank when they are big enough not to get eaten.

---------------------------- Best regards, Kim Kastberg
August 10, 2013
11:25 am
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mikev
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Thanks Kim,

I'm not getting too big spawns from them, 10-40, and good eggs are fewer... only about 15 collected yesterday. I have a feeling the fry starves to death somehow, the only time I succeeded in keeping them alive was when I put them into a quite dirty (but healthy) 2.5g... I'll try this again, hastatus fry seems to be doing fine there.
(Somehow some cory fry is easy for me, but some species I just cannot get through the initial stage. )

I think the fry is C089, not elegans after all... the fry lost most of the pattern it had initially. Another two weeks it will be certain.

Nay, the link changed since June, the fish I was asking about was this one, not clear if it will reappear or not... Still your comment on Scleromystax is very much appreciated... I have s.barbatus and possibly s.kronei (not sure if my two are a pair or not yet) and need to get to them one day. 8 species -- wow! -- seriously impressed, it is nearly impossible to even find them here other than the two I have.

August 12, 2013
6:46 am
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kim m
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Arh, sorry, never kept either gossei or CW69 :/

About the Scleromystax; they are fantastic fish, all of them! I don't know about prionotos though, it seems to be quite different, both morphologically and in breeding behaviour.
Going to the Catfish Study Group Convention around Manchester in march every year has gotten me most of my different Scleromystax. It's a fantastic event :)
Wasn't there this year though, but have been there for 5 years straight and there are hobbyist, breeders and scientists from all over the world more or less so lots of geeky talk and lots of fish trading :)

---------------------------- Best regards, Kim Kastberg
August 12, 2013
4:03 pm
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mikev
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no way I'm crossing the Atlantic for Scleromystax Embarassed but I'm wondering: do you still have c.guapore over there? Then I would be very tempted... the fish no longer in the US and it is #1 cory I'd love to get my hands on.

August 13, 2013
9:08 am
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kim m
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Guapore was bred in Scotland and Germany a few years ago, I don't know if they are still there.

---------------------------- Best regards, Kim Kastberg
August 13, 2013
3:52 pm
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mikev
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Then it is the same as in the US.. it was last seen perhaps around 2006, but if it is still here it is hiding real well.... :(

August 14, 2013
4:50 pm
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kim m
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This was 2010 og 2011. I actually took some home, but they did not last long :(

---------------------------- Best regards, Kim Kastberg
August 15, 2013
5:02 am
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mikev
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Very sorry. :( By all accounts this is a really nice species.

Perhaps this accidentally found link is of some use to you:
http://www.aquaticstoyourdoor......-Cory.html
They do say it is out of stock, but this seems to imply that they had it recently and may have a source.

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