Table 2. Molecular phosphatidylcholine (PC) species and their distribution in shrimp ovaries.

m/z	Molecular species	adduct	Distribution
756.5	16∶0/16∶1	Na	Oocyte stages 1–2
780.5	16∶0/18∶2	Na	Oocyte stages 3–4
782.5	16∶0/18∶1	Na	Oocyte stages 3–4
802.5	16∶1/20∶4	Na	All stages
804.5	18∶2/18∶2	Na	Oocyte stages 3–4
806.5	18∶1/18∶2	Na	Oocyte stages 3–4
808.5	18∶0/18∶2	Na	Oocyte stages 3–4
820.5	16∶0/20∶4	K	Oocyte stages 3–4
826.5	18∶2/20∶5	Na	Oocyte stages 3–4
828.5	16∶0/22∶6	Na	All stages
830.5	18∶1/20∶4	Na	Oocyte stages 3–4
832.5	18∶0/20∶4	Na	Oocyte stages 3–4
844.5	16∶0/22∶6	Na	Oocyte stages 3–4
850.5	18∶3/22∶6	K	All stages
852.5	18∶2/22∶6	Na	Oocyte stages 3–4
854.5	18∶1/22∶6	Na	All stages
870.5	18∶1/22∶6	K	Oocyte stages 3–4
874.5	20∶5/22∶6	Na	All stages
900.5	22∶6/22∶6	Na	All stages

All PC species were verified by MS/MS analysis; however, complete fragment ion information was difficult to obtain for some PC molecules. Therefore, lipid molecules for which only partial fragment ions could be obtained were identified by an online database search (http://www.hmdb.ca/labm/jsp/mlims/MSDbParent.jsp) and Simlipid software version 1.0. The underlined molecules were identified from MS/MS analysis and had complete fragment ion spectra.