Red grouper, like a number of other grouper species, are long-lived, slow to mature, protogynous hermaphrodites, beginning life as females, with some later transforming into males. Females transform into males between the ages of 7 and 12. Seafis farmers have been establish from year 2010, we focusing in fish culture (fingerlings, grouper, sea bass, milkfish and silver pomfret). Our Broodstock management have developed the best way to make our Broodstock can reproduce naturally and optimally, a number of new innovations and improvements have been adopted, control of Broodstock reproductive is essential for the sustainability of commercial aquaculture production . Plz give us the information that you need, so we can give you what you need and we can coorporate together for a long term trade. Sincerely , www.seafis.id