Characteristics Value Units       Moisture content 4.79 ± 0.03 % Ash content 31.73 ± 0.02 %       Total Kjeldahl nitrogen 64265 mg/kg Ammonium nitrogena 3492 mg/kg Percent ammonium nitrogena 5.4 % Organic nitrogena 60773 mg/kg Percent organic nitrogena 94.6 % Protein nitrogena 49339 mg/kg Percent protein nitrogena 76.8 % Chitin nitrogena 11434 mg/kg Percent chitin nitrogena 17.8 %       Chitinb 165907 mg/kg Proteinc 308369 mg/kg Fat 22000 mg/kg       Total carbon 305000 mg/kg Total organic carbon 176000 mg/kg       Elements     Magnesiuma 6150 mg/kg Calciuma 142000 mg/kg Manganesea 116 mg/kg Potassiuma 871 mg/kg Sodiuma 3480 mg/kg Irona 308 mg/kg Phosphorusa 22400 mg/kg Sulfura 4700 mg/kg Silicona 794 mg/kg Aluminuma 250 mg/kg Coppera 24 mg/kg Othersa 136207 mg/kg pH 8.64

aCharacteristics are presented on dry basis. bCalculated as chitin nitrogen × 14.51 cCalculated as protein nitrogen × 6.25

Table 1: Some characteristicsa of shrimp shells.