Dynamics of Thyroid Hormones at Early Stages of Development of the Sturgeon Acipenser güldenstadti

Whole-body concentrations of cortisol and sex steroids in white sturgeon (Acipenser transmontanus, Richardson 1836) during early development and stress response

“…A similar increase in thyroid hormone levels is always found, as mentioned above, in Acipenser gu¨ldenstadti (Boiko et al 2004). These hormones may be necessary to maintain glucose homeostasis during transition from the endogenous energy source (yolk) to an exogenous food supply (Barry et al 1995).…”

“…Cortisol ng/g Testosterone ng/g 17b-Estradiol ng/g 1 3.72 ± 1.00 ab (n = 6) 3.59 ± 0.42 a (n = 11) 4.26 ± 0.51 ab (n = 7) 3 1.69 ± 0.18 b (n = 6) 2.79 ± 0.37 ab (n = 13) 2.97 ± 0.57 bc (n = 8) 5 2.15 ± 0.25 ab (n = 6) 1.59 ± 0.29 bc (n = 7) 1.74 ± 0.24 cd (n = 6) 7 2.57 ± 0.59 ab (n = 6) 1.80 ± 0.25 bc (n = 11) 3.26 ± 0.34 bc (n = 7) 10 4.30 ± 0.65 a (n = 6) 2.45 ± 0.54 ab (n = 13) 6.70 ± 1.31 a (n = 8) In white sturgeon, data on the above steroids are scant, and only T 3 and T 4 have been investigated in the eggs, embryos, and larvae of the sturgeon Acipenser gu¨ldenstadti, showing a decrease in thyroid hormone levels during embryogenesis and a significant rise at hatching and the beginning of external nutrition (Boiko et al 2004). In the present study, the profile of 17b-estradiol in sturgeon eggs (unlike that of cortisol and testosterone) indicates that it is not involved in embryonic development.…”

A comparative histological study on early thyroid gland development in Acipenser stellatus and A. gueldenstaedtii larvae in hatchery

“…The thyroid gland secrets hormones that control various metabolic processes such as growth, differentiation, metamorphosis and central nervous system activity and seasonal adaptation in fish (Blanton & Specker, 2007;Power et al, 2001). Both A. stellatus and A. gueldenstaedtii larvae samples used in this study showed a normal pattern for organ and tissue develop- The presence of thyroid hormones was detected at all stages of early development, that is, in mature eggs being ready for fertilization, in embryos and also in developing fish larvae (Boiko et al, 2002(Boiko et al, , 2004Ortiz Delgado et al, 2006;Blanton & Specker, 2007).…”

“…In contrast to the previous reports in which the thyroid gland development and thyroid hormone activity in sturgeons were detected using histophysiological and radioiodine methods (Gorbman, 1969;Boiko et al 2002Boiko et al , 2004Plohman et al, 2002;Chanet & Meunier, 2014); an immunostaining method, which includes anti-human thyroglobulin and anti-human-TTF-1 antibodies targeting thyroglobulin hormone, was used for the first time for the detection of thyroid gland activity in sturgeons.…”

“…(), but in contrast, it was also reported that stellate sturgeon reaches to sexual maturity earlier than the Russian sturgeon (Chebanov & Galich, ; Chebanov et al., ; Dettlaff et al.,). It was previously reported that live feed induces an increase in the hormone production in sturgeons (Boiko & Grigoryan, ; Boiko et al., ; Chebanov & Galich, ; Chebanov et al., ). Similarly, in this study, it was detected that the thyroid gland activity showed an increase 4 days after the initiation of the live feeding stage in the stellate sturgeon and 7 days after the same point in Russian sturgeon.…”