Low Temperatures and
and more people around the world have started keeping their Goodeids
with a cool winter rest as a base for a good breeding. For many this seems
revolutionary, to keep toothcarps at these low temperatures. However, there are
many species from this family, cyprinodontiformes, that can handle these low
temperatures. Yes, many do directly benefit from low temperatures for a period
during the winter months.
the species mentioned in this article the cool temperature can vary from one
month to five months – all depending on the species.
have for some of them indicated that they are cold-hardy in the Danish climate (winter
down to –23C), as they are hardy in a garden pond. However, some of them are
only marginally hardy. They can handle the low temperatures but not the winter
rain which can cause the water to become acidious. Others can handle the cold
temperatures but not the length of them.
article does not cover how to make a succesful garden pond for toothcarps.
species in this overview can be used as garden pond fish during the summer
months and this can give the hobby a new aspect as well as teach us something
about their natural behaviour.
the here given data should be considered as a guideline. It can all ways
be recommended to investigate the species naturel history as well as the
climatic data from their habitat.
incompleate overview above these species with lowest temperature reference are:
atripinnis ssp. 10C*
sp. Illescas 7C*
eiseni “San Marcus” 10C*
species from Uruguay and Argentina 4C
Jenynsia lineata 4-10C
Jenynsia multidentata 4C*
latipinna (forms from the Carolina states and Texas) 4C*
latipinna (forms from other northamerican states) 10C*
mexicana 4-10C (Depending on location)
sphenops (Liberty Molly) 14C*
Heterandria formosa 10C*
caudimaculatus (southern forms from Uruguay and Argentina) 4C
caudimaculatus reticulatus 10C*
helleri (green aquarium form) 10C*
maculatus (Blue Mickey Mouse Platy) 10C*
and Central American Killiefish:
diaphanus ssp. 4C (hardy in Denmark)
Fundulus dispar 4C
Fundulus heteroclitus 4-10C
nottatus 4C(Hardy in Denmark) *
zebrinus 4C (Hardy in Denmark)*
sciadicus 4C (Hardy in Denmark)
baileyi baileyi (7C night temperature)12C*
nevadensis nevadensis 10C*
variegatus ovinus 4C (Marginally hardy in Denmark, depending on good water
floridae (7C night temperature)12C*
parva 4-12C (depending on the population)*
and Middleeastern killifish:
Aphanius anatoliae group with subspecies 2C (Marginally hardy in Denmark,
depending on good water quality)*
danfordii 0C (Marginally hardy in Denmark, depending on good water quality)*
dispar 4-15C (depending of the origin of the fish)*
iberus 4C (Marginally hardy in Denmark, depending on good water quality)*
here given data are based on own experience (marked with a *), experience from
others or habitat informations.
are all ways welcome to write me an email for more informations.