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The role of F‐series prostaglandins as reproductive priming pheromones in the brown trout
Author(s) -
Moore A.,
Olsén K. H.,
Lower N.,
Kindahl H.
Publication year - 2002
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/j.1095-8649.2002.tb01688.x
Subject(s) - brown trout , milt , biology , medicine , endocrinology , trout , metabolite , salmo , sex pheromone , sperm , fish <actinopterygii> , zoology , fishery , botany
Electrophysiological studies demonstrated that the olfactory epithelium of mature male brown trout Salmo trutta parr was acutely sensitive to F‐series prostaglandins (PGFs) PGF 1α and PGF 2α , with detection threshold concentrations of 10 −11 M. The olfactory epithelium was also sensitive to the PGF metabolite 15‐ketoPGF 2α (threshold 10 −8 m), but did not detect a further metabolite, 13,14,‐dihydro‐15‐ketoPGF 2α Immature brown trout did not detect any of the prostaglandins tested. Exposure of mature male brown trout parr to waterborne PGF 1α and PGF 2α (concentration 10 −8 m), resulted in significant increases in levels of expressible milt and the plasma concentrations of 17,20β‐dihydroxy‐4‐pregnen‐3‐one, testosterone and 11‐ketotestosterone. The olfactory epithelium of both immature and mature male brown trout parr was sensitive to the urine and ovarian fluid from ovulated female brown trout. Exposure of mature male brown trout parr to ovarian fluid resulted in an increase in the levels of plasma 17,20β‐dihydroxy‐4‐pregnen‐3‐one whilst exposure to urine increased the levels of expressible milt. In addition, PGF 2α was found to be present within both the urine and ovarian fluid of mature female brown trout. It is suggested that the F‐series prostaglandins have a role as priming pheromones in male brown trout.