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Changes in whole body concentrations of thyroid hormones and cortisol in metamorphosing conger eel

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Summary

To clarify the hormonal regulation of metamorphosis of the conger eel (Conger myriaster), changes in whole body concentrations of thyroid hormones, thyroxine (T4) and triiodothyronine (T3), and cortisol during metamorphosis were examined, as well as the changes in the histological activity of the thyroid gland. In larvae before metamorphosis, T4 and T3 levels were less than 5 and 0.15 ng·g-1 respectively. Levels of T4 increased to about 30 ng·g-1 during early metamorphosis, and decreased subsequently. Levels of T3 increased gradually in early metamorphosis, and then increased abruptly to about 2.0 ng·g-1 in late metamorphosis. Before metamorphosis, cortisol levels of the leptocephali less than 11 cm in total length were greater than 200 ng·g-1. Cortisol levels decreased rapidly in larger premetamorphic leptocephali, and low levels were maintained throughout the metamorphic period. Histological observation revealed an activation of the thyroid gland in early metamorphosis; thyroid follicle epithelial cells became columnar and their nuclei larger. Active uptake of colloid by these cells and intensive vascularization of the gland were also observed. By the end of metamorphosis, follicle epithelial cells became squamous, indicating a low level of glandular activity. These results suggest that thyroid hormone plays an important role in regulation of conger eel metamorphosis.

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Abbreviations

AL :

anal length

TL :

total length

T 3 :

triiodothyronine

T 4 :

thyroxine

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Authors and Affiliations

  1. National Research Institute of Aquaculture, 519-04, Tamaki, Mie, Japan

    Keisuke Yamano, Satoshi Miwa & Yasuo Inui

  2. Ocean Research Institute, University of Tokyo, 164, Nakano, Tokyo, Japan

    Masatomo Tagawa, Evelyn Grace de Jesus & Tetsuya Hirano

Authors
  1. Keisuke Yamano
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  2. Masatomo Tagawa
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  3. Evelyn Grace de Jesus
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  4. Tetsuya Hirano
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  5. Satoshi Miwa
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  6. Yasuo Inui
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Yamano, K., Tagawa, M., de Jesus, E.G. et al. Changes in whole body concentrations of thyroid hormones and cortisol in metamorphosing conger eel. J Comp Physiol B 161, 371–375 (1991). https://doi.org/10.1007/BF00260795

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  • DOI: https://doi.org/10.1007/BF00260795

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