Thyroid Hormone Content of Eggs and Early Developmental Stages of Three Stocks of Goitred Coho Salmon (Oncorhynchus kisutch) from the Great Lakes of North America, and a Comparison with a Stock from British Columbia

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Abstract
The thyroxine (T4) and triiodothyronine (T3) concentrations in embryos and larvae of two stocks of markedly goitred Lake Erie coho salmon (Oncorhynchus kisutch) were lower than in comparable developmental stages of a mildly goitred Lake Michigan and a nongoitred British Columbia stock. There was no apparent correlation between fecundity, egg weight, embryo mortality rates, or developmental rates of the three Great Lakes stocks and the egg yolk reserves of thyroid hormone, indicating that the reserves may not ipso facto affect developmental success. The low thyroid hormone levels of the embryos of the two Lake Erie stocks were probably related to the dysfunction in hormone uptake from the maternal blood during the period of oocyte growth, and not to low maternal blood thyroid hormone levels per se.

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