Fins are important for keeping balance, propelling, and steering through the water. Many of them have paired fins and personal fins along the midline. The caudal fin or tail fin is located centrally and is generally utilized to propel the trawl forward. Notice that @nemanja's solution does include the alias https://interactive-cat-toys52073.sharebyblog.com/37171138/the-definitive-guide-to-pet-aquarium-supplies