Last night my female guppy died and male really misses her he sits around does nothing when should be playing with other two fish. Is fish depressed?

Yes, it's possible for fish to become depressed following the loss of a mate. Fish can form social bonds and relationships with other fish of the same species, and losing a close companion or mate can cause them to go into a state of mourning or depression. This is especially common in territorial or social species that form strong pair bonds.

Here are some signs of depression in fish:

* Loss of appetite

* Lethargy

* Hiding or withdrawing from social interaction

* Reduced activity or exploration of the environment

* Staying in one spot for extended periods

* Loss of color or vibrancy

* Increased susceptibility to disease

To help your male guppy cope with the loss of his mate, here are a few things you can do:

* Consider getting another female guppy. This can provide him with companionship and reduce loneliness. However, it's important to make sure that the new female is compatible with the male and that your tank can accommodate the additional fish.

* Rearrange the tank. Changing the environment can provide the male with a sense of novelty and distraction, helping him focus on new things rather than his grief.

* Provide plenty of hiding places. If the male feels stressed or overwhelmed, having a place to retreat to can help him feel more secure.

* Increase interaction. Spend some extra time observing and interacting with the male guppy. This can provide him with attention and stimulation.

* Watch for signs of illness. Fish that are depressed may become more susceptible to disease. Keep a close eye on the male guppy and address any health issues promptly.

If you are concerned about the male guppy's well-being, it's a good idea to consult with a veterinarian who specializes in fish or an experienced aquarist for further advice and assistance.