Fish, Tanks and Ponds

Fish, Tanks and Ponds
A comprehensive guide to fish

Sub-Tropical Fish

White cloud mountain minnow
White cloud mountain minnow


As we all know there are fish which we regard as being cold water fish and there are fish which we regard as being tropical fish. But in nature the world doesn't suddenly go from cold to tropical the changes occurs very gradually. Most fish live somewhere between the two but this isn't often reflected in the way that we keep our fish.

Some popular sub-tropical species

Cypriniformes - Carps

  • Rosy Barb, Puntius conchonius - 18 to 22C.
  • Dwarf Golden Barb, Puntius gelius - 18 to 22C
  • Chinese Barb, Puntius semifasciolatus - 18 to 22C
  • Two Spot Barb, Puntius ticto - 14 to 22C
  • Zebra Danios, Danio rerio - 18 to 24C
  • Bengal Danio, D devario - 15 to 26C
  • White Cloud Mountain Minnow, Tanichthys albonubes - 18 to 22C
  • Sinibotia superciliaris - 20 to 25C
  • Hill Stream Loach, Gastromyzon sp - 20 to 23C

Siluriformes - Catfish

  • Scleromystax barbatus - 20 to 22C
  • Corydoras paleatus - 18 to 23C
  • Whiptailed Loricaria, Rineloricaria fallax - 15 to 15C

Cyprinodontiformes - Livebearers and killifish

  • Guppies, Poecilia reticulata - 18 to 28C

Perciformes - Perches

  • Paradise fish, Macropodus opercularis - 16 to 25C

Obviously there are many thousand more fish which fit in to this category and most of these fish will do better and live much longer if they are kept at a lower temperature than is normally found in most tropical aquariums. It is very easy to research the needs of most species of fish apart from simply asking the vendor who will likely as not tell you what he needs to in order to make a sale.

If you buy one of the fish which normally does best at lower temperatures from a shop where it has been kept at higher temps, don't suddenly place the fish in cooler water. The chances are it will become lethargic and go off its food. It is better to slower acclimatise the fish over a period of days slowly lowering the temp by a couple of degrees at a time.

A heater should still be included because these fish still have a minimum temperature requirement and cool nights when the central heating is off could see the temp dropping below what is ideal. Apart from that temperature fluctuations are generally stressfull to the fish and should be avoided.