essentially the issue is that in any individual there are resessive genes that are covered by a correct copy of the gene. This is actually more common than people think, infact as much as you dont think it, you do, we all do. When you inbreed the chance of the babbies getting two copies of that defective gene are as high as 50%. One or two of these defective genes is generally not an issue but when you get a whole individuals genome full of the defective genes then you have issues. Inbreed fry have an extremely high mortality rate becasue of these issues.
Inbreeding is the reason that lots of fish are becming less colourful and dying earlier. In the fish breeding world it is common knowledge that german bred stock is more colourful and longer lived. this is becasue in germany to become a licenced breeder you need to comply with their rules. one of which is that you need to introduce new blood lines every three generations. Because of this their fish are stronger, brighter longer lived and more expensive.
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