Jump to content


Innes Gambusia


68 replies to this topic

#61 Guest_fundulus_*

Guest_fundulus_*
  • Guests

Posted 10 September 2007 - 11:08 PM

Or does water tend to be darker in more southern coastal areas, so that melanistic patterns confer protection from predators? If it was sun alone one would expect to find melanism common in a wide range of fish which isn't the case. And the same is true of temperature. The melanophores that give an animal darker coloration have a very specific embryonic developmental pathway so we're sliding into evo-devo territory. And, I have no clear answer for all of that....

#62 Guest_jamjam_*

Guest_jamjam_*
  • Guests

Posted 18 September 2007 - 09:17 AM

So, bottom line on this is that I'm not getting any Innes Gambusia then... :)

#63 Guest_Brooklamprey_*

Guest_Brooklamprey_*
  • Guests

Posted 18 September 2007 - 11:05 PM

So, bottom line on this is that I'm not getting any Innes Gambusia then... :)


May be better to check with the American livebearer assoc. folks....

#64 Guest_fundulus_*

Guest_fundulus_*
  • Guests

Posted 18 September 2007 - 11:18 PM

So, bottom line on this is that I'm not getting any Innes Gambusia then... :)


Maybe I missed the point, but after all of this is anyone clear on what is an "Innes Gambusia"? After following various leads I'm not.

#65 Guest_jimjim_*

Guest_jimjim_*
  • Guests

Posted 19 September 2007 - 07:53 AM

Hi All; The point Fundulus brings up about darker water = darker fish might be good except the spotted Gambusia here are visible from a good deal away. It seems the population I'm refering to here have developed a bright white pearl background with black mottled spots. Great color for Egrets, Herons, stc. You can see them really well when the sunlight hits them. It seems so far only the males have this color. The females are all just dark unless stressed then turn lighter. My health dosent allow me to collect very many. (Can't walk very well) But have slave labor for this weekend. I'll try to get pics of habitat and the fish, please dont laugh at my photo skills ;-) ...Jim

#66 Guest_jamjam_*

Guest_jamjam_*
  • Guests

Posted 19 September 2007 - 08:51 AM

Maybe I missed the point, but after all of this is anyone clear on what is an "Innes Gambusia"? After following various leads I'm not.


I was referring to the type that Michael Ronayne is/was working with. I agree with you that it should be referred to by a different name, but since that's what it is known as currently that's the name I used.

#67 Guest_lampeye_*

Guest_lampeye_*
  • Guests

Posted 16 April 2008 - 10:16 AM

Okay, it seems like there was a lot of heat in this thread, but some fact-checking would have cooled it off.

Early editions of Innes' Exotic Aquarium Fishes (It's in my 1947 ed. as well as my prized 1st. ed) show a photograph of a melanistic PAIR of Gambusia. So there's the origin of the name. The name "Innes gambusia" for strains with mottled females (which are, after a quick perusal of some threads previously mentioned as well as some scientific lit, INTERGRADES of melanistic G. affinis and G. holbrooki)appears to be fairly widespread in Europe, and on the ALA and Goodeids.com forum. so there's no reason not to keep using it. Even if one were dead set against the name (why? It's a cultivated variety!), Michael could claim naming rights for at least HIS artificially selected variety, so like it or not, there would have to be some legitimacy to the name "Innes gambusia" for such fish.

#68 Guest_ivan09193_*

Guest_ivan09193_*
  • Guests

Posted 01 September 2009 - 11:28 PM

I realize that I'm resurrecting an old thread, but some of the points presented here necessitate some reflection.

First of all, here's the paper that demonstrated inducible expression of melanin in Gambusia holbrooki.

http://jeb.biologist...int/209/24/4938

I'm interested in Ronayne's reference to a second set of sex determination chromosomes in Gambusia holbrooki. According to the paper presented above, inheritance of melanin is sex-linked by the Y chromosome, but is also affected by one or more autosomal loci. Perhaps Ronayne is referring to the autosomal loci? If not, are there any references in the literature demonstrating that holbrooki has the second chromosome set? Finally, I thought that Ronayne's reference to hybrid sex chromosome genotypes was interesting (WY genotype = female?). Does anyone have any literature references to karyotypes of hybrid affinis/holbrooki?

#69 Guest_Uland_*

Guest_Uland_*
  • Guests

Posted 02 September 2009 - 12:04 AM

I try not to make short posts with little input but this is exactly why I never complain about reviving old topics.
Thanks for posting!



Reply to this topic



  


0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users