Biological characteristics of autumn and spring runs of Caspiomyzon wagneri into the Shirood River, Iran

Authors

1 Fisheries Department, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran.

2 Research and Collections Division, Canadian Museum of Nature, Station D, Ottawa, Ontario, Canada K1P 6P4.

3 Fisheries Department, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran

Abstract

Various biological characteristics were compared between autumn and spring runs of
Caspiomyzon wagneri migrating into the Shirood River, in an attempt to determine whether
these were reproductively isolated. Two spawning runs of the same lamprey species in a
single river are apparently unique to the Shirood. The autumn sample collected between 21
October and 1 November 2009 comprised 15 adults and the spring sample collected
between 22 March and 18 April 2009 comprised 38 adults. While spawning was not
witnessed, the significantly shorter mean total length of at least 40 cm in both males and
females, and the significantly higher gonadosomatic index in females of the autumn run
versus the spring run suggest that the former is closer to spawning than the latter. If one
assumes a single spawning population per year in the river, the report by Nazari and Abdoli
(2010) of recently spent individuals of Caspian lamprey collected in the Shirood River
during April, would therefore imply that the spawning period is remarkably protracted. In
order to test this hypothesis, the spawning sites need to be searched for higher upstream
over the entire year, particularly in areas where suitable spawning substrate of gravel and
sand occurs

Keywords

References

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Environmental Resources Research
Volume 5, Issue 2
July 2017
Pages 111-122

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