Northern Seahorse (Hippocampus erectus) trawled from near the surface, Gulf of Mexico, July 2018. Part of the DEEPEND project.

The lined seahorse is a species of fish that belongs to the family Syngnathidae. "H. erectus" is a diurnal species with an approximate length of 15 centimeters and lifespan of one to four years. The "H. erectus" species can be found with a myriad of colors, from greys and blacks to reds, greens, and oranges.