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Thyroxine Levels in Immature Parr and Mature Male Parr of Baltic Salmon, Salmo Salar L., During the Time of Smoltification

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image of Netherlands Journal of Zoology
For more content, see Archives Néerlandaises de Zoologie (Vol 1-17) and Animal Biology (Vol 53 and onwards).

Thyroxine (T4) levels in plasma were measured in immature parr and mature male Baltic salmon parr over the period April to June. Both immature parr and mature male parr displayed a smoltification peak in T4 in mid-April. The T4 levels in the mature male parr were similar or higher (significant at one point only) than in the immature parr. The possible relation between T4 levels and saltwater adaptibility in the two groups is discussed.

Affiliations: 1: Dept. of Zoology, University of Stockholm, S-106 91 Stockholm, Sweden; 2: Salmon Research Institute, S-810 70 Älvkarleby, Sweden


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