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Poly‐ and oligomerization of scales in the blue bream B allerus ballerus (Cyprinidae) as a consequence of thyroid status regulation
Author(s) -
Levin B. A.,
Levina M. A.
Publication year - 2014
Publication title -
journal of applied ichthyology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.392
H-Index - 62
eISSN - 1439-0426
pISSN - 0175-8659
DOI - 10.1111/jai.12529
Subject(s) - biology , cyprinidae , thyroid , hormone , fish <actinopterygii> , scale (ratio) , endocrine system , zoology , physiology , medicine , endocrinology , fishery , physics , quantum mechanics
Summary Poly‐ and oligomerization of serial elements are among the ways to enhance, weaken or even change organ's function and might contribute to adaptation of animals. Involvement of thyroid hormones in development and formation of adult phenotype of scale cover was found recently. Cyprinid fish blue bream B allerus ballerus has relatively high number of scales in lateral line (62–77) and may serve as appropriate object to examine the role of thyroid regulation of scale number in fish. Individuals kept under different hormonal conditions manifest highly differential number of scales. Experimental variation of scale number (49–114) broadly exceeds the limits of natural variation known for species. Goitrogen‐treated fish have an increased scale number (polymerization), while triidothyronine‐treated fish have a reduced scale number (oligomerization). Additionally fish of most prolonged retardation of development (goitrogen‐treated) demonstrate phenotype of partially naked skin. This event of reduction of squamation and partial nakedness occurred due to underdevelopment. Also we suggest the regulation of the development by the thyroid hormones is thought to be a perspective approach to mark periods of determination of number of serial elements.