assuming all lions like the red firefish reproduce the same way...
http://www.houstonzoo.org/Animal/vie...&animal_ID=101
"Reproduction:A dominant male lionfish mates with a "harem" or group of females. After courting, the female releases a gelatinous ball that contains thousands of eggs. The male then fertilizes the eggs. The gelatinous ball dissolves within 24 hrs., releasing the individual fertilized eggs. Neither the male nor the female guards the eggs. Once hatched, the newborn fry start to feed on plankton.
GESTATION
Gestation Period:36Hrs
"