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Sex Differentiation and Early Gonadal Development in Brook Trout
Author(s) -
Sacobie Charles F. D.,
Benfey Tillmann J.
Publication year - 2005
Publication title -
north american journal of aquaculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.432
H-Index - 41
eISSN - 1548-8454
pISSN - 1522-2055
DOI - 10.1577/a04-059.1
Subject(s) - gonad , biology , salvelinus , development of the gonads , trout , sexual differentiation , ovary , sperm , fontinalis , gametogenesis , zoology , anatomy , endocrinology , fishery , embryo , fish <actinopterygii> , embryogenesis , genetics , gene
Gonadal differentiation in brook trout Salvelinus fontinalis , as determined from samples collected weekly from 42 to 1,572 degree‐days (°C) posthatch, occurs between 393 and 464 degree‐days posthatch. During this interval, the gonad transforms from a structure containing several developing primordial germ cells into either a gonad with well‐developed perinucleolar oocytes or a gonad with cavities that ultimately develop into sperm ducts or the gonadal circulatory system. Brook trout demonstrate differentiated development, in which the gonad develops directly into a testis or an ovary, and anatomical differentiation precedes cytological differentiation in both ovaries and testes. The data provided by this study should aid in the development of techniques for hormonal sex reversal in brook trout.