Suppression of cannibalism in the intertidal copepod Tigriopus japonicus (Mori, 1932) and improvements in population density using artificial substrates

Abstract The present study investigated population growth, egg production and cannibalism in the intertidal harpacticoid copepod Tigriopus japonicus (Mori, 1932). Copepods were cultured on artificial substrates with different surface areas, from 13.5 × 10 3 to 10.6 × 10 4 mm 2 , to clarify the effect of surface area in a culture vessel on population density. The cannibalism rate at a surface area of 10.6 × 10 4 mm 2 was significantly lower (by a sixth) than that at 13.5 × 10 3 mm 2 . These results suggest that artificial substrates play a role in preventing cannibalism by providing shelter and can increase the stocking population density of T. japonicus in a vessel.