While many fish do swim horizontally, there are several examples of fish that swim vertically or even upside down:
* Seahorses: These fascinating creatures swim upright, using their fins to propel themselves through the water.
* Pipefish: Similar to seahorses, pipefish also swim vertically, often blending in with seaweed or coral.
* Anglerfish: Some species of anglerfish, like the "bottom-dweller" anglerfish, rest on the ocean floor and swim with an upward tilt.
* Flying fish: While not swimming upside down, flying fish actually leap out of the water and glide through the air, using their large pectoral fins as wings.
* Flatfish: Species like flounders and halibut lie on the seafloor with one eye on top and the other on the bottom. They can swim but often use their fins to propel themselves along the bottom.
So, while horizontal swimming is common, there is a diverse range of fish that move through the water in unique and fascinating ways!