Acts as a pheromone. Triggers aggressive behaviors in males such as fin beating, lunging and grabbing. These behaviors form part of the competition for fertile females. Expressed in ciliated epithelium of nidamental gland and in secretory-like cells in accessory nidamental gland (at protein level). Expressed in ovary, nidamental gland and accessory nidamental gland. Belongs to the beta-microseminoprotein family.