Hi Guys,
Gambusia are my favourite species of livebearers, I think they are great.
At the moment I have quite a few species, alvarezi, holbrooki (melanistic form), affinis, sexradiata, punctata, puncticulata and a few different unidenitified species from El Toboso, Media Luna and Rio Purificacion in Mexico.
Just a couple of points regarding preceding posts; firstly Innes Gambusia are a hybrid of holbrooki and affinis; produced by Mike Innes (I think his name); they are particularly cold tolerant apparently and both the male and female are melanistic (spotty); with holbrooki, only the males are melanistic.
There are plenty of different species of Gambusia in Texas and many of them are rare and endangered. Nobilis and Gaigei are probably the most endangered species and Gaigei in particular were rescued from a particularly precarious position of one trio. Many other species are already extinct, including geiseri. Other species such as affinis are thriving and threatening the other species which are also being threatened by the drying up of springs and the loss of habitats to man. Recently a new species, clarkhubbsi has been discovered. To my knowledge, rhizophorae is not found in Texas, they are known as Mangrove Gambusia and comes from Florida and Cuba, not Texas.
Butch, are you saying that you have one tank of Gambusias? With lots of different species in it?
Finally for now, go careful when classifying Gambusia, many of them look extremely similar and there is alot of bad classification around. You really need to be sure to get them from reliable sources. I only now get them from one or two people and the wild as I have been stung a few times before.