Can we put betta fry outside in sunlight?

[Aniket]

If we put betta fry in direct sunlight with 15 cm depth of water. Will it helpfull fir their growth or temperature raise will trouble them?

 

[Colin_T]

Most fish don't like being in direct sunlight especially if there are no floating plants. They get attacked by birds and it stresses them out.

If you have them in a pond that is outside in the sun, and it has floating plants in, they are usually fine. However, if the water gets too hot it will kill them so make sure the ponds are in the shade during hot weather. Add some aeration to circulate the water and maximise the oxygen levels. Baby Bettas can't breath air until their labyrinth organ develops at around 3 months old.

Larger volumes of water hold their temperature better and are less inclined to have massive changes in temperature throughout the day. If the containers are shallow there could be 10-20C changes in temperature during the day and night and this is bad for the fish.

If you have large bodies of water in the sun, the fry can sit under the surface where it's warm and if it gets too hot they can move into deeper cooler water.