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It's more science than it is opinion. Egg layers have a higher mortality rate in the wild because the eggs/fry are more exposed to predation, therefore more eggs are laid to maintain the population. Mouthbrooders protect their young much longer giving them a lower mortality rate and thus, less eggs/fry need to be produced to maintain the population.

It's pretty much universal. Populations on the lower end of the food chain require more offspring to maintain the population, while apex predators (for example) require less.
 
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