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Paros in Aquar­ium Glaser

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3 years 4 months ago 3 years 4 months ago #5750 by Peter Finke
Replied by Peter Finke on topic Paros in Aquar­ium Glaser
For me, P. bin­tan is one of the rid­dles of the genus. It was described at a time where we were far of the knowl­edge of the many local forms that are more or less sim­i­lar, quite a few of them native to Suma­tra that was hardly well-​known at that time. This holds for Mau­rice Kot­te­lat, too. in the two decades since we came across many bintan-​like forms. Take Beli­tung, an island near Bangka on which Horst Linke found P. spec. Beli­tung. The prob­lem is at least as much a prob­lem of the­o­ret­i­cal biol­ogy than as much a prob­lem of empir­i­cal knowl­edge of local­i­ties. It is mir­rored by the fact that Kot­te­lat is silent on Parosphromenus since his last descrip­tion of five new species in 2005. They were rather clearly sep­a­ra­ble by struc­tural cri­te­ria, not by mere colour. Since then descrip­tion has become dif­fi­cult: You hit the bor­der of the tra­di­tional meth­ods that ignore genetic means. But all we have learned since then by genetic analy­sis is that the many dif­fer­ent but sim­i­lar forms are extremely near to each other. Since then bin­tan has become a catch-​all-​species, and as aquarist-​specialists we react by speak­ing of bintan-​like fish.
Clearly, these fish to be seen here are bintan-​like. If you take only the well-​described species they are bin­tan, no doubt. The asso­ci­a­tion “P. deiss­neri” is clearly wrong, for that species can be dis­tin­guished by clear struc­tural cri­te­ria. With­out any reli­able infor­ma­tion on their loca­tion there is no other deter­mi­na­tion pos­si­ble. But a ques­tion remains: Are all those bintan-​like forms bin­tan or not? Is blue-​line bin­tan? Is Sen­tang bin­tan? Is Beli­tung bin­tan? And that reduces to the ques­tion: Is the descrip­tion of bin­tan suf­fi­cient and final even in 2016?
My posi­tion is the fol­low­ing: Parosphromenus is so inter­est­ing a genus since we come across fish that are highly diver­si­fied locally. Why? Because the species are still devel­op­ing, on the basis of local seg­re­ga­tion. Presently, we encounter a still-​photo of a highly dynamic evo­lu­tion, the evo­lu­tion of dif­fer­ent species from a com­mon mother-​species, but in many cases the process has not come to an end so far. This is the rea­son why Kot­te­lat is silent. What with his tra­di­tional tax­o­nomic meth­ods and in the light of the genetic sim­i­lar­ity should he do oth­er­wise?
Con­clu­sion: The Glaser fish is not deiss­neri, but a bintan-​like form. Whether it is bin­tan, is not a ques­tion of exactly look­ing at these fish but a ques­tion of the species-​concept we use in the case of the dynam­ics of presently ongo­ing evo­lu­tion. My ten­dency is to use it in rather restric­tive a way, say: all are bin­tan, because for devel­op­ing species I pre­fer to be a lumper. And that means we have to refor­mu­late — at least to sup­ple­ment — that decrip­tion of bin­tan in the light of the many new forms. But my impres­sion is that many peo­ple, even tax­on­o­mists, and espe­cially aquar­ists (even noto­ri­ous dis­cov­er­ers as Horst Linke) pre­fer to be split­ters; they tend to take devel­op­ing species to be (hith­erto unde­scribed) species already.
I don’t think we could say more at present. For a more detailed analy­sis we need bet­ter pho­tos (lighter!); then we could pos­si­bly make some sug­ges­tions on the local­ity the fish might come from. But that’s all. We could not say whether they are bin­tan or only bintan-​like. Since that’s a ques­tion of how to deal with ongo­ing evo­lu­tion in the tax­o­nomic business.
Last edit: 3 years 4 months ago by Peter Finke.

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3 years 4 months ago 3 years 4 months ago #5751 by mar­tin
Replied by mar­tin on topic Paros in Aquar­ium Glaser
Thank You for your reply Lawrence, Bill and Peter. I remem­ber what it was at the begin­ning of my paros adven­ture — I wanted to know which exactly species I have and that knowl­edge become more impor­tant than ques­tions How to keep my paros suc­ces­full ..
Now , my ques­tion about the species is less impor­tant — every sin­gle species or color form of genus Parosphromenus is beau­ti­full and exactly same impor­tant as the oth­ers… Dur­ing almost 5 years of my expe­ri­ence I saw the species which were avail­able in big quan­ti­ties ( those days I thought — the are less desir­able by me — I wanted to have realy rare species ..) but after some time ( year-​two) the same species gone from the trade and I didn’t saw them again …( P. anjun­ga­nen­sis for eg.).

Impor­tant thing is to keep them healthy, breed them and spread the fry between Pol­ish paro keep­ers..:)
Good BRIGHTER pic­tures of mat­ing males will also be done :)

Best regards !
Last edit: 3 years 4 months ago by mar­tin.

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  • Peter Finke
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3 years 4 months ago #5752 by Peter Finke
Replied by Peter Finke on topic Paros in Aquar­ium Glaser
Con­grat­u­la­tions, Mar­tin!
Peter

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