The lined seahorse (Hippocampus erectus), northern seahorse or spotted 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 (5.9 inches) 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. The lined seahorse lives in the Atlantic Ocean as far north as...