Once it was apparent it was able to move, thy could have helped it into the water
In a real survival situation they would have eaten it. Since the “don’t eat endangered critters” is a show limitation, the show could have compensated. Maybe not with the equivalent amount of food, but with something.
Also, I’m pretty sure Jewish dietary rules are waived in life threatening situations. Though some of the contestants look to have a decent fat reserve and live with limpets and coconuts (well, everyone could probably live, but some better than others). A decent meal would certainly help morale though - don’t know if there any other edible plants on the island.
Guess I missed it when Bear said they had a fishing net (I know they had machetes and the jerry cans)