Abstract
Territorial behavior of males of masked greenling Hexagrammos octogrammus guarding the nest site with eggs until hatching of embryos in the aquarium is studied based on visual observations and videorecording. Formation of defensed territory around the nest and dynamics of aggressive contacts between the guarding male, conspecific individuals, and other fish species are described. Factors determining the shape of the nesting territory, as well as the features of behavior of masked greenling in the aquarium in comparison to behavior of this species in natural conditions, are discussed.
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