![]() This now segues quite nicely with the topic of Genetic Exclusivity. The females of the species find these large foreheads irresistible and will rebuke the advances of fish with a less-pronounced forehead in order to mate with the one with the large, and presumably, more attractive forehead. In fact, the males of many fish species develop large foreheads during the mating season. So a large forehead can contribute greatly to a fish’s ability to simply survive.Īnother advantage of the large forehead comes at mating time. A fish with a large, intimidating forehead is safer, by far, than a small, streamlined fish that by mere virtue of its body shape is often considered prey by other fish. It is size, or at least the perception of size, that may determine whether a fish is bullied, harassed, or even preyed upon. In the wild, and to a much lesser extent even in the aquarium, size often matters. A predominant forehead aids the fish in achieving the three things a fish needs to survive as a single entity, and as a species: Protection, Procreation, and Genetic Exclusivity. Large foreheads give fish an edge over rivals of other or even the same species. Fish with large foreheads developed these grand foreheads over the course of millennia, or as a result of careful experimentation and breeding. ![]() What are the reasons why certain fish grow such large foreheads? It all comes down to genetics of course. While the Lionhead Goldfish indeed has a large forehead, its forehead cannot be compared to the forehead of the Dolphinfish or any other large species of fish, nor can a small variety of fish such as the Lionhead Goldfish physically attain a forehead that would compare in size to that of a Dolphinfish. Large fish, such as the seagoing Dolphinfish, which can grow to almost five feet in length, may have big foreheads, but again, this is in comparison to its overall body size and shape. A Lionhead Goldfish grows to about five inches in length, yet its distinctive “hood” gives it a big forehead in comparison to its overall size. The large forehead size in a fish may be large in comparison to the body size of the fish, but when compared to the overall size of a different species of fish, it could actually be considered smaller or even larger then when it is first observed. So in that case, why have a large forehead at all? Let’s find out. A small species of fish with a large forehead will probably still have a smaller forehead than a larger species of fish. Keep in mind however that a large forehead, especially in the case of aquarium fish, is relative. ![]() Big forehead fish may have this trait for a variety of reasons.
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