Abstract
Summary
The diurnal fattening response to prolactin in the Golden Topminnow, Fundulus chrysotus, involves a circadian periodicity of fattening sensitivity to the hormone. Phasing of the rhythm in fish kept in continuous light can be obtained by injections of thyroxin. A phase angle of 18 hr between the time of thyroxin injection and the time of prolactin injection results in conditions favoring the accumulation of fat stores. Phase angles of 6 hr do not promote fattening.
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