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The location of the State of Tennessee in the United States of America. Topographic map of Tennessee. The U.S. state of Tennessee has a uniquely diverse array of fresh-water fish species, owing to its large network of rivers and creeks, with major waterways in the state including the Mississippi River which forms its western border, the Tennessee River, the Cumberland River, and the Duck River.
Adaptive hypotheses, including the locomotor hypothesis, [7] Trexler-DeAngelis Model [8] (reproductive allotment), and life-history facilitation, [9] [6] broadly suggest that the placenta evolved to facilitate the evolution of another advantageous trait in the fish's environment. The conflict hypothesis suggests the placenta is a nonadaptive ...
Livebearers are fish that retain their eggs inside the body and give birth to live, free-swimming young. They are especially prized by aquarium owners. They are especially prized by aquarium owners. Among aquarium fish, livebearers are nearly all members of the family Poeciliidae and include: guppies , mollies , platies and swordtails .
The guppy (Poecilia reticulata), also known as millionfish or the rainbow fish, [3] is one of the world's most widely distributed tropical fish and one of the most popular freshwater aquarium fish species. It is a member of the family Poeciliidae and, like almost all American members of the family, is live-bearing. [4]
Some of the world's most popular aquarium fish such as guppies, swordtails and mollies are from this subfamily. [2] They have been introduced to many regions in the world, either accidentally or to control mosquitoes, and have become invasive species threatening local populations of similar, small fishes. [ 3 ]
Heterandria formosa (known as the least killifish, dwarf topminnow, mosqu or midget livebearer) [3] is a species of livebearing fish within the family Poeciliidae. This is the same family that includes familiar aquarium fishes such as guppies and mollies. Heterandria formosa is not as commonly kept in aquaria as these species.
Such algae covered aquarium tanks, are not always a pleasant sight, so the young fish should be raised in a separate algae covered tank and not in the parent's aquarium itself. After a 24 days gestation period, from five to ten, and rarely up to 15, young are born, each measuring 2 to 2.5 mm. Sexual maturity occurs after the third or fourth month.
Live-bearing fish exhibit either vivipary or ovovivipary and sometimes both. Note : If a species or grouping of fish species appears here and is known to be either ovoviviparous or viviparous please redirect to the relevant category.