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National Geographic has referred to snakeheads as "fishzilla" [6] and the National Geographic Channel reported the "northern snakehead reaches sexual maturity by age two or three. Each spawning-age female can release up to 15,000 eggs at once. Snakeheads can mate as often as five times a year.
The northern snakehead fish, dubbed "Frankenfish" and shown here in a photo from the U.S. Department of Agriculture, is an invasive species from Asia that threatens North American ecosystems and native species.
- Jesslyn Shields
What is a “frankenfish”? AquaBounty’s “frankenfish” is a transgenic Atlantic salmon. The company inserts two bits of DNA into the genome of an Atlantic salmon egg: a Chinook salmon gene for a growth hormone, and genetic regulatory elements from an ocean pout, an eel-like fish.
Then they injected the new gene into Atlantic-salmon eggs. The resulting fish reach market size in 18 months, half the usual time—so they can land on our grills faster.
The fish have a high fecundity and lay 22,000 to 115,000 eggs at a time. They breed up to five times a year. Although some of the eggs and fry die, parental care likely improves reproductive success compared to the situation in fish that don't guard their young.
They can spawn up to five times, each time laying more than a thousand orange-yellow eggs, which are buoyant. Sometimes they can lay many more, however, approaching 50,000 eggs per year.
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Mar 23, 2016 · In Atlantic salmon, the female initiates the mating process by making a nest with eggs. The male then comes by and sprays the eggs with his sperm.
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