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Concentrations of endogenous steroids and their glucuronide conjugates fluctuated during early development in steelhead trout Oncorhynchus mykiss. Whole body content of sex steroids and steroid glucuronides of both bisexual and gynogenetic (all female) steelhead trout were quantified by...
Monoamine neurotransmitters and their metabolites in the trout pituitary have been studied. Dopamine (DA), serotonin (5HT), dihydroxyphenylacetic acid (DOPAC), and 5-hydroxyindoleacetic acid (5HIAA) were separated as pure peaks by HPLC. Peak purity and identity were confirmed by electrochemical...
To design a homologous bioassay for the molt-inhibiting hormone and the crustacean hyperglycemic hormone of the shrimp Penaeus vannamei, the effect of sinus gland homogenate (SGh), in vitro, on ecdysteroid production by Y-organs (YOs), and the effect of the injection of SGh, in vivo, on the...
There is convincing evidence that euthyroid male American tree sparrows are already programmed for seasonal reproduction and postnuptial molt by Week 4 of photostimulation. To explore more precisely when, during early photostimulation, thyroid-dependent programming of seasonal events occurs,...
Renin-like activity (RLA), angiotensin I converting enzyme-like (ACELA), and kallikrein-like activity (KLA), activities of the key enzymes of renin–angiotensin and kallikrein–kinin systems, were sought in the kidney of the African lungfish Protopterus annectens during the aquatic phase. RLA,...
The neurons of the caudal neurosecretory system of teleosts contain, in addition to urotensin I and urotensin II, a high concentration of acetylcholine (T. Ichikawa, 1978, Gen. Comp. Endocrinol. 35, 226–233). The isolated urophysis (and attached terminal spinal cord region) of the rainbow trout...
Prompted by evidence of a linkage between the thyroid gland and seasonal reproduction in obligately photoperiodic American tree sparrows ( Spizella arborea ), we measured circulating T 4 ( L -thyroxine), hypothalamic cGnRH-I (chicken gonadotropin-releasing hormone, variant I), pituitary and...
The patterns of vitellogenesis and follicle maturational competence were examined across the semilunar spawning cycle of Fundulus heteroclitus. Daily egg collection showed spawning cyclicity in six experimental groups, with a mean period between spawnings of 14.9 ± 0.3 days, indicated by the...
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