Can guppies live in sea water

Overall guppies are freshwater fish. Guppies are found in tropical habitats so they are also tropical fish. You can keep guppies in your freshwater aquarium. As guppies are tropical fish, you should try to emulate the tropical environment in your fish tank for guppies. Jun 25, 2021 (source)
While mostly found in freshwater, guppies can also tolerate brackish environments (a mix of freshwater and saltwater) and have colonized several estuaries (where a large river runs into the ocean). (source)
Since guppies are a tropical fish breed, they need a somewhat warm water to thrive in it. Mostly, an aquarium with water that’s at least 70 degrees Fahrenheit warm, should do it. But if you want to make them feel totally comfortable, 78 degrees is even better. You don’t need to go higher than that. (source)
Euryhaline fish can live in both fresh and salt water and usually have salt concentrations somewhere in the middle. Salmon, for example, are born in freshwater but live out most of their lives in the ocean. They return to freshwater only to spawn and keep their solute concentrations around 1%. Oct 5, 2020 (source)
https://www.youtube.com/watch?v=U3Bg3jSewLM
They recognize you – Guppies are smarter than most people give them credit for. They can recognize their owners, even though they have limited capabilities of showing it. They may see you sticking your hand in their aquarium as an opportunity to greet and interact with you. Jan 20, 2022 (source)
South America Guppies are a species of freshwater, tropical fish native to South America. There are nearly 300 different types of guppy throughout rivers in the Amazon, as well as in Barbados, Brazil, Guyana, Trinidad and Tobago and Venezuela. Jun 24, 2016 (source)
Overall, our conclusion is that guppies and goldfish should not live together. It’s far better to choose to keep only one species or to house them in their ideal conditions within separate tanks. There many species of fish in the aquarium hobby that go perfectly together in the same tank setup. Nov 3, 2021 (source)
Guppy fish stay small during their lives; therefore, they don’t require huge tanks to accommodate their needs. Even when kept outdoors, they’ll do fine in a patio pond kit that’s set up with aerators, lights, air pump and enough water volume (a foot or two deep). Jul 24, 2019 (source)
NO, guppy fish can’t live without oxygen. Guppies breathe by pumping water through their gills which takes out the oxygen from the water. In the next part, I will give you some info on how the oxygen exchange works and how to increase the oxygen level in your aquarium water. Dec 13, 2021 (source)
The most common reason for guppies dying in your aquarium is the poor water quality. By feeding your fish you actually pollute the water in your tank. Guppies produce waste (they poop and pee), which is polluting the water. Over time the pollution can become so high, that the guppies will get intoxicated and will die. (source)