Thyroid hormone concentrations in the gonads of wild chum salmon during maturation

M. Tagawa, T. Ogasawara, Tatsuya Sakamoto, T. Miura, K. Yamauchi, T. Hirano

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Changes in gonadal and plasma concentrations of thyroid hormones were examined at various stages of maturation in chum salmon (Oncorhynchus keta) caught in the Bering Sea and the Bay of Alaska. Plasma concentrations of thyroxine (T4) were less than 5 ng ml-1, and those of 3,5,3′-triiodo-L-thyroxine (T3) were less than 2 ng ml-1 I in both males and females, regardless of the degree of sexual maturity or the gonadosomatic index (GSI). There was no clear relationships between circulating thyroid hormone levels and tissue levels. The ovarian T4 concentrations were undetectable (less than 0.2 ng g-1) or less than 2 ng g-1 when GSI was lower than 1%, but increased thereafter and reached a plateau of 8-10 ng g-1 when GSI became 2%. The ovarian T3 concentrations were about 5 ng g-1 when GSI was 1%, increased to a maximum level (20 ng g-1) when GSI was about 2%, and decreased to a constant level of 10 ng g-1 thereafter. The T4 and T3 content in single oocyte increased proportionally to the oocyte volume, indicating a constant incorporation of the hormones into the oocyte. The T4 concentrations in the testis were 1 ng g-1 or less regardless of the GS1. On the other hand, the T3 concentrations were highest (15 ng g-1) when the GSI was less than 1%, decreased thereafter when spermatocytes appeared in the testis, and became about 5 ng g-1 I in testes containing spermatozoa, raising the possibility of a role for T3 during early gamete and/or gonad maturation of testes.

Original languageEnglish
Pages (from-to)233-240
Number of pages8
JournalFish Physiology and Biochemistry
Volume13
Issue number3
DOIs
Publication statusPublished - Jul 1994
Externally publishedYes

Fingerprint

Oncorhynchus keta
gonadosomatic index
Gonads
thyroid hormones
Thyroxine
Thyroid Hormones
L-thyroxine
hormone
triiodothyronine
Testis
gonads
maturation
Oocytes
Plasmas
testes
oocytes
Hormones
Tissue
Spermatocytes
Germ Cells

Keywords

  • ovary
  • teleost
  • testis
  • thyroid hormones in maturing gonads
  • thyroxin
  • triiodothyronine

ASJC Scopus subject areas

  • Physiology (medical)
  • Physiology
  • Biochemistry
  • Biochemistry, Genetics and Molecular Biology(all)
  • Aquatic Science

Cite this

Thyroid hormone concentrations in the gonads of wild chum salmon during maturation. / Tagawa, M.; Ogasawara, T.; Sakamoto, Tatsuya; Miura, T.; Yamauchi, K.; Hirano, T.

In: Fish Physiology and Biochemistry, Vol. 13, No. 3, 07.1994, p. 233-240.

Research output: Contribution to journalArticle

Tagawa, M. ; Ogasawara, T. ; Sakamoto, Tatsuya ; Miura, T. ; Yamauchi, K. ; Hirano, T. / Thyroid hormone concentrations in the gonads of wild chum salmon during maturation. In: Fish Physiology and Biochemistry. 1994 ; Vol. 13, No. 3. pp. 233-240.
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abstract = "Changes in gonadal and plasma concentrations of thyroid hormones were examined at various stages of maturation in chum salmon (Oncorhynchus keta) caught in the Bering Sea and the Bay of Alaska. Plasma concentrations of thyroxine (T4) were less than 5 ng ml-1, and those of 3,5,3′-triiodo-L-thyroxine (T3) were less than 2 ng ml-1 I in both males and females, regardless of the degree of sexual maturity or the gonadosomatic index (GSI). There was no clear relationships between circulating thyroid hormone levels and tissue levels. The ovarian T4 concentrations were undetectable (less than 0.2 ng g-1) or less than 2 ng g-1 when GSI was lower than 1{\%}, but increased thereafter and reached a plateau of 8-10 ng g-1 when GSI became 2{\%}. The ovarian T3 concentrations were about 5 ng g-1 when GSI was 1{\%}, increased to a maximum level (20 ng g-1) when GSI was about 2{\%}, and decreased to a constant level of 10 ng g-1 thereafter. The T4 and T3 content in single oocyte increased proportionally to the oocyte volume, indicating a constant incorporation of the hormones into the oocyte. The T4 concentrations in the testis were 1 ng g-1 or less regardless of the GS1. On the other hand, the T3 concentrations were highest (15 ng g-1) when the GSI was less than 1{\%}, decreased thereafter when spermatocytes appeared in the testis, and became about 5 ng g-1 I in testes containing spermatozoa, raising the possibility of a role for T3 during early gamete and/or gonad maturation of testes.",
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N2 - Changes in gonadal and plasma concentrations of thyroid hormones were examined at various stages of maturation in chum salmon (Oncorhynchus keta) caught in the Bering Sea and the Bay of Alaska. Plasma concentrations of thyroxine (T4) were less than 5 ng ml-1, and those of 3,5,3′-triiodo-L-thyroxine (T3) were less than 2 ng ml-1 I in both males and females, regardless of the degree of sexual maturity or the gonadosomatic index (GSI). There was no clear relationships between circulating thyroid hormone levels and tissue levels. The ovarian T4 concentrations were undetectable (less than 0.2 ng g-1) or less than 2 ng g-1 when GSI was lower than 1%, but increased thereafter and reached a plateau of 8-10 ng g-1 when GSI became 2%. The ovarian T3 concentrations were about 5 ng g-1 when GSI was 1%, increased to a maximum level (20 ng g-1) when GSI was about 2%, and decreased to a constant level of 10 ng g-1 thereafter. The T4 and T3 content in single oocyte increased proportionally to the oocyte volume, indicating a constant incorporation of the hormones into the oocyte. The T4 concentrations in the testis were 1 ng g-1 or less regardless of the GS1. On the other hand, the T3 concentrations were highest (15 ng g-1) when the GSI was less than 1%, decreased thereafter when spermatocytes appeared in the testis, and became about 5 ng g-1 I in testes containing spermatozoa, raising the possibility of a role for T3 during early gamete and/or gonad maturation of testes.

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