کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2425074 1552972 2007 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Development of thyroid gland and changes in thyroid hormone levels in Leptocephali of Japanese Eel (Anguilla japonica)
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم آبزیان
پیش نمایش صفحه اول مقاله
Development of thyroid gland and changes in thyroid hormone levels in Leptocephali of Japanese Eel (Anguilla japonica)
چکیده انگلیسی

Development of the thyroid gland of the Japanese eel (Anguilla japonica) was studied with the use of tank-reared fish. A single thyroid follicle was first found in larvae at 29 days post hatching (dph), total length (TL) 12 mm. Until reaching 25 mm in TL (100 dph), leptocephali had one or two follicles per individual. The inner colloid of the follicles was weakly immuno-positive against the anti-thyroxine (T4) antibody. The number of thyroid follicles and the immunoreactivity later increased as the larvae grew. Thyroid hormones (TH) T4 and triiodothyronine (T3) were not detected in premetamorphic larvae by radioimmunoassays, but became detectable during metamorphosis. The maximum level of T4 was seen in fish at the end of metamorphosis and in just-metamorphosed juveniles, whereas T3 reached the highest level during metamorphosis and declined toward the end of metamorphosis. The results indicated that the thyroid gland first became active during metamorphosis in the development of eel.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Aquaculture - Volume 270, Issues 1–4, 28 September 2007, Pages 499–504
نویسندگان
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