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Effects of Varied Ionic Concentrations on The Feeding Ability of Cordylophora caspia, An Invasive Hydroid

The objective of our study was to observe the effects of KCl concentrations on nematocyst functionality as it related to feeding ability in the invasive hydroid Cordylophora caspia (phylum Cnidaria, class Hydrozoa). Nematocysts are stinging organelles encapsulated in cnidocytes on the tentacles. When tentacles are tactilely stimulated by prey, cnidocytes experience a rapid uptake of water and ions, resulting in a buildup of osmotic pressure that ultimately forces the nematocyst from the cell, rendering the prey immobile. This discharge mechanism makes nematocyst function potentially susceptible to variation in environmental NaCl and KCl concentrations.