Yes, there is a species of fish that are only female. The Amazon molly, found in parts of Texas and Mexico, reproduces through a process called gynogenesis. They mate with male fishes of other species, but the DNA passed on to the offspring is strictly from the female. All Amazon mollies are clones of their mother.
P. formosa and P. monacha lucida are both unisexual fish. They are always female because though they require a sperm cell to activate the egg, the DNA from the sperm is discarded, leaving only the female DNA.
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