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Serum thyroxine concentrations in larval and metamorphosing anadromous sea lamprey,Petromyzon marinus L.

✍ Scribed by Wright, Glenda M. ;Youson, John H.

Book ID
102892480
Publisher
John Wiley and Sons
Year
1977
Tongue
English
Weight
574 KB
Volume
202
Category
Article
ISSN
0022-104X

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✦ Synopsis

Thyroxine (T4) concentrations in samples of fresh sera taken from fed and unfed larval (ammocoetes) and metamorphosing anadromous sea lamprey (Petromyzon marinus) were measured by means of radioimmunoassay. T4 levels in unfed ammocoetes after a 1-month period were not significantly different from those of the fed ammocoetes. Nutritional state of ammocoetes therefore does not seem to affect their serum T4 levels. Serum T4 concentrations decreased abruptly at the onset of metamorphosis and declined to levels observed in spawing adults (Leloup and Hardy, '76; Packard et al., '76) by the middle (stage 3) of metamorphosis. No significant change in serum T4 levels occurred between stage 3 to the end of metamorphosis. The possible significance of decline in serum T4 levels to the metamorphic event in lamprey is discussed.

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Immunocytochemical localization of thyro
Immunocytochemical localization of thyroglobulin in the endostyle of the anadromous sea lamprey,Petromyzon marinus L.
✍ Wright, Glenda M. ;Filosa, M. F. ;Youson, J. H. πŸ“‚ Article πŸ“… 1978 πŸ› Wiley (John Wiley & Sons) 🌐 English βš– 322 KB

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The effect of exogenous thyroid hormones (TH), thyroxine (T4) or triiodothyronine (T3), on spontaneous metamorphosis and serum T4 and T3 levels was examined in immediately premetamorphic sea lampreys (Petromyzon marinus) from two populations. Size (> or = 120 mm in length and 3.0 g in weight) and a