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https://www.omicsonline.org/electrode-placement-and-electroejaculation-of-blue-swimmer-crab-portunus-pelagicus-linnaeus-2157-7617.1000142.pdf Electrode Placement and Electroejaculation of Blue Swimmer Crab, Portunus pelagicus (linnaeus) blue swimmer crab electrode placement portunus pelagicus electroejaculation