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Non‐lethal assessment of reproductive stage for female blue sharks Prionace glauca using sex steroid hormones
Author(s) -
Fujinami Yuki,
Semba Yasuko
Publication year - 2020
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/jfb.14312
Subject(s) - biology , pregnancy , hormone , endocrinology , medicine , reproduction , juvenile , chondrichthyes , fishery , andrology , ecology , genetics
Plasma concentrations of progesterone (P 4 ) and 17β‐oestradiol (E 2 ) in juvenile, pre‐ovulatory, early, mid‐ or late pregnancy stages of female blue sharks Prionace glauca were analysed. Concentrations of P 4 were significantly higher in pregnant than in non‐pregnant individuals, whereas E 2 concentrations increased with embryonic and follicular development. A highly accurate (86.1%) random forest classification model was developed to predict shark pregnancy. It is proposed that hormone concentrations could be used for the subsequent non‐lethal determination of female P. glauca reproductive state.