genomes - harvesting fertilized eggs from Tetraodontidae species?

I would like to know how easy/difficult it is to harvest fertilized eggs from Tetraodontidae species such as Tetraodon nigroviridis or Takifugu rubripes compared to zebrafish? Ultimately, I would like to know how much material would be obtainable from Tetraodontidae eggs to extract DNA from the nuclei.

I know zebrafish lay lots of eggs, and other model fish species like medaka lay much fewer of them, but I couldn't find any information about Tetraodon nigroviridis or Takifugu rubripes after some googling.