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9

I think this is probably a checkered puffer Sphoeroides testudineus based on your location and picture, with the wave-reflection patterning on the dorsal surface and ventral speckling the most obvious features. (image from https://biogeodb.stri.si.edu/caribbean/en/thefishes/species/4403 ) Could be a different Sphoeroides, but I looked through other species ...


0

In round numbers fresh water is 2 ft for 1 psi. For example 50 ft depth requires 25 psi to barely push out an air bubble. There are other factors like resistance of an air diffuser ,etc. If that is a little too "round" , use 0.866 psi for 2 ft . Fresh water = 62.4 pounds/cubic foot; a square ft is 144 square inches , so 62.4/144 = pounds/sq.in at ...


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