Multiple marking of alizarin complexone for the otolith of nigorobuna Carassius auratus grandoculis and estimation of individual size-at-release

Migratory freshwater fish species are particularly susceptible to population decline because they rely on multiple habitats and open passages to complete their life cycle. Understanding the migratory patterns of cyprinids is thus essential for their management and conservation. Gnathopogon caerelescens, a small cyprinid species endemic to Lake Biwa (Japan), is one of the most important targets of inland fisheries. However, their abundance has dramatically decreased. By using an extensive alizarin complexone-mark-and-recapture program for of G. caerelescens juveniles, together with the collaboration of commercial fishermen, this cyprinid fish was demonstrated as: (1) migrating from a nursery lagoon toward the main lake and moving along the near-shore from spring to autumn; (2) migrating from the near-shore shallow habitats to off-shore deep habitats from autumn to winter; and (3) migrating to a nursery lagoon from off-shore deep habitats from winter to spring. These results highlighted the importance of protecting individual spawning/nursery habitats, and maintaining connectivity between each spawning/nursery habitat and the lake system.

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Changes in swimming speed of larval and juvenile nigorobuna Carassius auratus grandoculis associated with growth and exercise training in running water

公一¹,

崇広²,

修一³

2010

NSUGAF

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Changes in swimming speed of larval and juvenile nigorobuna Carassius auratus grandoculis associated with its growth and exercise training in running water were investigated in order to obtain basic data for considering the eŠective release strategies for the stock enhancement program in Lake Biwa. As a result, increase in burst speed was observed until approximately 16 mm in standard length (SL). During the juvenile stage (≧16 mm SL), a rapid increase in the cruising speed and a marked increase in the swimming ability were observed. The results strongly indicate that ca. 16 mm SL is an eŠective criterion for release. Increase of burst speed in larval and/or juvenile nigorobuna by exercise training in running water was observed, but when theˆsh reared in run-

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Multiple marking of alizarin complexone for the otolith of nigorobuna Carassius auratus grandoculis and estimation of individual size-at-release

Cited by 8 publications

References 16 publications

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Changes in swimming speed of larval and juvenile nigorobuna Carassius auratus grandoculis associated with growth and exercise training in running water

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