The Cichlid Room Companion

Thanks for all the feedback guys! Installed the second pump this afternoon. Got some water flow going now. The fish actually have to swim to stay in place...
Cheers, m

Hi guys, thanks for the feedback. The problem is: the pump I have is already the largest piston pump on the market. I decided to call the manufacturer today. He said that multiple piston pumps are good to be hooked up to the same system (as long as all of them have the same capacity). The model I ha...

Hi guys, after starting all tanks in my fish room (all filtered through bubble filters), the air pressure is somewhat lower than I like. I have a second air pump. Can I hook up the second pump to the same circle? Or do I actually have to redo all the plumbing and create two independent circles (whic...

Piotr,
these are clearly C. myrnae, also your "females", not hybrids or C. septemfasciatus. However, I'm not sure whether your females are females. Females have a conspicuous spot in the dorsal. That spot may still develop in fish as small as yours, but they may also be immature males.
Cheers, m

Hi all, this is an interesting discussion! By definition, natural groups are monophyletic groups, I concur with Willem. But while higher taxonomic groups (genera, families, etc.) should - by convention - be natural, i.e. include all descendants from a common ancestor, biological species do not neces...

Hi Ingo,
habitat shows and specimens were taken in the Sawariwau River (Takutu drainage).
Cheers, m

Hi all, we collected the species a couple of years ago. Pretty habitats, pretty fish;) https://lh4.googleusercontent.com/_h9i0wh-nUJQ/SZhq3bISfCI/AAAAAAAAC5g/eZGJuKbmVWs/s400/P2021857.JPG https://lh5.googleusercontent.com/_h9i0wh-nUJQ/SZhqg4rF6_I/AAAAAAAAC48/PwSAo9UyPt0/s400/P2011814.JPG Cheers, m

Thanks Michi, I have them from a shop they where labeled as Astyanax bimaculatus, That was the only thing i know about them. They are also older than the fish in the first picture. Sorry Willem, Yes, talk about Cichlids on a cichlidforum is also a good idea ;) And your movie is amazing 8) Hi Michae...

Sorry Willem....
@Michael: I'd say it's the same species. Where is it from?
Cheers, m

This is based on older taxonomy. Most authorities on Central American fish (backed by phylogenetic evidence) agree that A. fasctiatus is restricted to South America. Mexico has three species of Astyanax. A. mexicanus in the North, A. aeneus in the southern portion, and A. altior on Yucatan. A. arman...

DRE, A. fasciatus is a South American species.
Cheers, m

Astyanax aeneus as well.
Cheers, m

Hi Willem,
in this case it is definitely not A. mexicanus (which is a northern species), but Astyanax aeneus (in all cases). They can be differentiated relatively easily by the shape of the body and the head (and the distribution).
Greetings, Michi

Hi Willem,
great footage (especially the Hypsophrys shots from Nicaragua!). Where did you shoot the Astyanax? I might be able to identify them.
Cheers, m

Hi all, just a quick comment. While Ingo's remark about competing scientists making things complicated sure had a kernel of truth, I am afraid that the situation isn't that simple. Central American cichlids, particularly the Vieja/Therpas and the "Cryptoheros" s.l. groups, have a quite complicated e...

Very nice! I just recently looked at your pictures that illustrated that article I once wrote. Stunning fish!
Cheers, m

Oh... I'm sorry... I always get sidetracked when there's talk about nice prawns. You should be able to get shrimp in the rivers (several species in your area). Baited traps at night do the trick.
Cheers, m

In Peten, it will be a different but similar species of shrimp, M. acanthurus....

Provided you are on the Pacific slope, the shrimp seems to be Macrobrachium tenellum.
Cheers, m

Hey Mack, do you mean the standard deviation or derivatives? I don't think there is such a thing as a standard derivative; except in the sense that there is some basic derivatives for simple functions that students are forced to learn in calculus.
Cheers, m