event  cast  cycle     date_local  lat       lon        depth  niskin  taxon               size_class  abundance  
304    25    Cycle_2   07042010    9.04192   -90.56041  40     10      diatoms             2_to_10     0          
304    25    Cycle_2   07042010    9.04192   -90.56041  40     10      diatoms             10_to_20    1          
304    25    Cycle_2   07042010    9.04192   -90.56041  40     10      diatoms             gt20        1          
304    25    Cycle_2   07042010    9.04192   -90.56041  40     10      diatoms             total       1