site          sitenum  datetime             Group           lat           lon          
site256       256      2015-01-01T01:56:00  Silverfish      -77.68712772  165.3722308  
site256       256      2015-01-01T01:56:00  LargeFish       -77.68789142  165.3683754  
site256       256      2015-01-01T01:56:00  Krill           -77.68740191  165.3703066  
site256       256      2015-01-01T01:56:00  WeakScatterers  -77.68755179  165.3689182