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Circannual and circadian variations in plasma levels of steroids (cortisol, estradiol-17β estrone, and testosterone) correlated with the annual gonadal cycle in the catfish, Heteropneustes fossilis (Bloch)

BiologyAnimal PhysiologyAnnual Gonadal CycleEndocrine MechanismPlasma LevelsMedicinePhysiologyReproductive BiologyCircadian VariationsEndocrinologyCircadian RhythmPublic HealthReproductive HormoneReproductive Endocrinology