Basic Statistics for Epidemiology: Prevalence vs Incidence. In short, epidemiology is sort of the who what, when, why, how and where of disease. It doesnât involve any experimentation or clinical trials, so it is really of interest to public health, because it is just about what happens.
So if a queen-sized waterbed with a bladder-type mattress holds roughly 130 gallons of water that weighs in at 1,084 pounds plus the weight of the frame and two people.o keep the math simple let s assume that the mattress, frame and two adults weighs 1,300 pounds and that the bed assembly measures six feet by six feet taking up a total of 36 square feet of floor space. If we divide the weight of the bed by 36 the square footage-that gets us to 36 pounds per square foot.
You don't want your tank to be dark and have the bait swimming into the sides and injuring itself. WEIGHT is a big factor for some people. Keep in mind that water weighs about 8 lbs/gallon. So a 20 gallon tank is going to weigh about 160 lbs plus the weight of the tank itself. A 50 gallon tank is going to weigh about 400 lbs - probably not a good choice for a 15' skiff. That said though, I would go as big as you can. I can keep about 25-30 mackerel or about 12-15 pogies alive in the 20 gallon tank.