species                     sample_number  cruise_id  lat    lon      date         length  replicate_number  d15N   d13C    Molar_C_to_N  
Euphausia_distinguenda      Ed1            SWFSC1631  3.25   -120.03  2006-08-11   nd      1                 8.3    -21.8   6.50          
Euphausia_distinguenda      Ed2            SWFSC1631  7.37   -124.68  2006-08-13   nd      1                 15.0   -21.3   5.71          
Euphausia_distinguenda      Ed3            SWFSC1631  3.49   -131.27  2006-09-11   nd      1                 6.4    -21.8   6.58          
Euphausia_distinguenda      Ed4            SWFSC1631  2.30   -105.26  2006-10-25   nd      1                 5.0    -22.3   7.01          
Euphausia_distinguenda      Ed5            SWFSC1631  3.36   -110.85  2006-10-27   nd      1                 9.0    -21.0   5.66          
Euphausia_distinguenda      Ed6            SWFSC1631  9.61   -96.48   2006-10-21   nd      1                 10.2   -20.5   7.30          
Euphausia_distinguenda      Ed7            SWFSC1631  5.39   -99.53   2006-10-23   nd      1                 9.1    -21.6   6.67