A terminal mouth means that the mouth is at the same level as the fish in the front of the head. Terminal mouths are commonly seen on most fish, including some of the most popular fish species (like freshwater angelfish) available to a fish enthusiast. Because of this, we see 4 main types of mouths among freshwater and saltwater fish. ![]() A fish with decent-sized lips that preys on organisms in the substrate may not find it beneficial to have an upwards-pointing mouth. When looking at fish with big lips, consider the overall purpose of the mouth structure. Soon, mouth structure gave way to teeth, crushing palates, and suction cup-like structures. The development of a skeletal jaw allowed fish to diversify in both prey and lifestyle. Today, some of those ancestors can be seen in jawless fish, like lampreys (Hyperoartia class). When fish first evolved, they had a simple mouth that lacked a jaw. This means that the mechanism for catching these prey should be as specialized as possible! At the same time, lips can act as a way to fight off competition or attract mates. Lips might not seem like an important of evolution, but most fish are predators that use their mouths every day to catch prey. Some of the most popular fish in the aquarium hobby have modified mouths that have special dietary considerations!.Fish lips are generally divided into four categories: terminal, inferior, superior, or protrusible.Fish can use their lips for predation, interactions, and reproductive purposes. ![]() The shape and size of fish lips and mouths can tell a lot about the predatory behaviors of the species.Chloroquine Phosphate Aquarium Dosing Calculator.
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