Predicted to enable calcium ion binding activity. Acts upstream of or within heart morphogenesis. Predicted to be active in myofibril. Is expressed in several structures, including brain; eye; gill; heart; and musculature system. Human ortholog(s) of this gene implicated in familial hypertrophic cardiomyopathy and hypertrophic cardiomyopathy 10. Orthologous to human MYL2 (myosin light chain 2).