Reproduction, growth rate and dispersal of the dark chub, Candidia sieboldii, as estimated by using the mark-release-recapture method

We investigated the breeding season, growth rate and dispersal of the dark chub, Candidia sieboldii, an endangered species in Japan. A mark-release-recapture survey was performed in three branches of the Ishizu River system in Osaka Prefecture, Japan, between May 2012 and August 2013. A total of 963...

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Bibliographic Details
Published in:Journal of freshwater ecology 2017-01, Vol.32 (1), p.633-641
Main Authors: Matsuoka, Haruka, Hirai, Norio, Ishii, Minoru
Format: Article
Language:English
Subjects:
Animal morphology
Biometry
Breeding
Breeding seasons
Candidia
Conservation
Dispersal
Dispersion
Endangered species
Fish
freshwater fish
Growth rate
Japan
Jolly-Seber method
Length
Life span
lifespan
Longevity
Rare species
Reproductive failure
Rivers
Surveying
Weirs
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Summary:We investigated the breeding season, growth rate and dispersal of the dark chub, Candidia sieboldii, an endangered species in Japan. A mark-release-recapture survey was performed in three branches of the Ishizu River system in Osaka Prefecture, Japan, between May 2012 and August 2013. A total of 963 individuals were marked in one river branch and 275 (29%) were recaptured at least once in the same river section. The breeding season was determined to be June-August, and the size at maturity for both males and females was estimated at about 70 mm standard length. Growth rates calculated from standard lengths of recaptured individuals were higher between April and September than between October and March. Among 963 marked individuals, only a single fish was found 500 m downstream from the release point. Moreover, although we released 409 more marked individuals in the three branches to follow inter-branch dispersal between September and December 2013, we observed none. These results indicate that this species has low dispersal and a short lifespan of 1-2 years. This short lifespan could increase the risk of breeding failure, and the low frequency of dispersal, restricted by weirs, could make population re-establishment and recovery difficult.
ISSN:0270-5060
2156-6941
DOI:10.1080/02705060.2017.1383316