Mature males of Arctic charr,Salvelinus alpinus,release F-type prostaglandins to attract conspecific mature females and stimulate their spawning behaviour |
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Authors: | Torarinn Sveinsson Toshiaki J Hara |
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Institution: | (1) Department of Fisheries and Oceans, Freshwater Institute, Winnipeg, Manitoba, R3T 2N6, Canada;(2) Present address: Department of Physiology, University of Iceland, Vatnsmyrarvegur 16, IS-101, Reykjavík, Iceland |
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Abstract: | Synopsis We examined the behavioural and biological functions of prostaglandins (PG) of F-type as a chemosensory signal during spawning
in Arctic charr. Immunoassay revealed F-type PGs in water inhabited by ripe charr of both sexes performing spawning-related
acts. High concentrations of immunoreactive PGFs seemed to coincide with male spawning activity. Ripe isolated males were
more odorous to other charr (as assayed by EOG) than either females or immature charr. When these males received chemical
cues from ovulated females, they increased their release of odorants, including F-type PGs, into the water. PGF2α at concentrations of 0.1 nM attracted ovulated females and ripe males. It also stimulated digging behaviour in mature females.
It is concluded that F-type PGs or their derivatives are released by ripe males on the spawning grounds to attract females
and elicit their spawning behaviour. |
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Keywords: | Pheromone Spawning Salmonids Fishes |
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