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The social organization and reproductive behavior of the hawkfish Cirrhitichthys falco Randall (Cirrhitidae) was studied at Tanguisson Reef, Guam and at additional Pacific localities. Single males dominated social groups of 1–7 females; “sneaker” males and juveniles
were also present in some social groups. Male-male social interactions were rare and limited to encounters between dominant males and sneaker males, rather than adjacent dominant males. Male-female, female-female and male-juvenile interactions were usually limited to the onset of dusk. Interspecific
interactions were also common at this time. Courtship and spawning behavior was sequential and occurred daily at the Tanguisson site, commencing just after sunset and continuing until darkness. Thirteen motor patterns were utilized during courtship resulting in pelagic spawning.
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