Fish Going About on Land?

Can any modern day fish go about on land? Yes. Some fish spend most of their time out of the water.

Mudskippers are fascinating amphibious fish known for their unique ability to live outside of water. They have evolved special adaptations that allow them to thrive in muddy intertidal regions. Mudskippers can breathe through their skin and absorb oxygen through an extensive network of blood capillaries, enabling them to stay out of water for extended periods. These fish have large frog-like eyeballs that move independently, providing them with excellent vision both above and below the water’s surface. Additionally, mudskippers are carnivores, feeding on invertebrates, crustaceans, small fish, insects, and worms. They are talented jumpers and can even climb trees, showcasing their remarkable agility on land. Mudskippers dig burrows in the mud for protection against predators, regulating their temperature, and laying eggs. To keep mudskippers as pets, they require a habitat with brackish water and a setup that includes both land and water elements. Overall, mudskippers’ ability to live outside of water is supported by their unique respiratory adaptations and behaviors that make them well-suited for their intertidal habitats[6][7][8].

In addition to mud skippers, there is the land walking snakehead fish.

The land walking snakehead fish is a unique aquatic species that has evolved the ability to “walk” on land by moving its head and back fin in opposite directions. This fish can absorb oxygen through its gills underwater and take air gulps on land, enabling it to survive for up to four days out of water. Snakeheads are aggressive predators with an appetite for fish, frogs, beetles, and dragonfly larvae. They have been spotted in various states in the U.S., prompting officials to order their destruction due to their threat to native wildlife and ecosystems[1][2][3]. The snakehead’s invasion into new territories highlights the risks associated with releasing non-native species into the wild, disrupting local ecosystems and endangering native species[2].

Leave them alone long enough and they will evolve.  

Citations
^{[1] https://nationalzoo.si.edu/animals/news/meet-snakehead-fish-can-walk-land
[2] https://www.cosmopolitan.com/lifestyle/a29441155/walking-snakehead-fish-breathe-land-georgia-kill/
[3] https://www.youtube.com/watch?v=rmhG5yKax8A&t=0
[4] https://www.youtube.com/watch?v=WwgjW3AIJa4
[5] https://www.youtube.com/watch?v=KuKyLcHd3lw
[6] https://www.youtube.com/watch?v=pKX9C5oSdgw&t=0
[7] https://livingrainforest.org/learning-resources/asian-mudskipper
[8] https://en.wikipedia.org/wiki/Mudskipper
[9] https://roundglasssustain.com/species/mudskipper
[10] https://oceanconservancy.org/blog/2022/05/12/5-facts-mudskippers/}