If you want to breed your captive amphibians, be warned: There's precious little known about the breeding of most amphibians in captivity.
Of the more than 200 species of salamanders, frogs, toads, treefrogs and caecilians offered in the pet trade, only a few dozen have been captive bred, and of these some breedings have happened by accident rather than as the result of a concerted effort on the part of their keepers.
Because of their lifestyles and especially their breeding habits, amphibians are truly "fine-tuned" to climatic and atmospheric cues. The cycle of light and dark, relative humidity, temperature, barometric pressure and rainfall are among the natural phenomena that induce annual reproductive cycling in amphibians.
Most amphibians are egg-layers, but some (such as the fire salamander and Alpine black salamander, some caecilians and a few rarely seen toads) produce live young.
Rather than being traditionally shelled, amphibian eggs are contained in a gelatinous outer-covering. They dehydrate rapidly if moisture levels are not ideal. The eggs may number from a few (small treefrogs) to many thousands (bullfrogs and other large ranid frogs).
Many egg-laying species deposit their clutches in standing water, but some species lay their eggs in damp terrestrial locations. There are variations on both themes. Among these variations are the several treefrogs termed leaf frogs that lay their eggs on leaves overhanging water (the tadpoles drop into the water after hatching) and the poison frogs (once called arrow-poison frogs) in which a parent carries the newly hatched tadpoles on its back for several days, finally depositing them in a tiny ephemeral puddle or a bromeliad-cup.
Most species that deposit their eggs in water go through a tadpole stage (frogs, toads and treefrogs) or larval stage (salamanders and caecilians), while most species that lay eggs on land undergo direct development. (The young develop fully in the egg-capsule, hatching as miniatures of the adults.)
When the Time is Right
Amphibians can use several varying breeding strategies. Some (such as chorus frogs, wood frogs, tiger salamanders) are winter breeders, being drawn from woodlands to temporary breeding ponds by winter rains during the shortest days of the year. Others, like the bullfrog, live in permanent ponds and breed during the longest and hottest days of the year.
In the tropics, seasonal day length and temperatures do not change much, but seasonal changes in rainfall can be considerable. Because of this, amphibians are induced to breed by the start of the rainy season and require a similar stimulus when captive. Even fully aquatic amphibians are stimulated to breed because the rain initially cools the river and floods the rainforests.
Many of the larger scale captive breeding programs use a natural cycle, then stimulate actual egg laying and sperm development by administering LHRH (lutenizing and release) hormones.
Although we can give you some generalities about cycling amphibians for breeding, we urge that you research each species individually.
Breeding Temperate Latitude Amphibians
To reproductively cycle your temperate latitude terrestrial or semi-aquatic amphibians:
Breeding Tropical Latitude Amphibians
To reproductively cycle your tropical latitude terrestrial or semi-aquatic amphibians:
Breeding Temperate Latitude Aquatic Amphibians
To reproductively cycle your temperate latitude aquatic amphibians: