Seasonal distribution of adult crucian carp nigorobuna <Emphasis Type="Italic">Carassius auratus grandoculis</Emphasis> and gengoroubuna <Emphasis Type="Italic">Carassius cuvieri</Emphasis> in Lake Biwa,Japan |
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Authors: | Yoshio Kunimune Yasushi Mitsunaga Kazuyoshi Komeyama Masanari Matsuda Toru Kobayashi Tsutomu Takagi Takeshi Yamane |
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Institution: | (1) Faculty of Agriculture, Kinki University, 3327-204 Nakamachi, Nara Nara, 631-8505, Japan;(2) The Education and Research Center for Marine Resources and Environment, Faculty of Fisheries, Kagoshima University, Kagoshima Kagoshima, 890-0056, Japan;(3) Lake Biwa Museum, Kusatsu Shiga, 525-0001, Japan; |
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Abstract: | Seasonal habitat use by nigorobuna Carassius auratus grandoculis Temminck et Schlegel and gengoroubuna Carassius cuvieri (Temminck et Schlegel) in Lake Biwa was investigated using acoustic telemetry. Twenty-three nigorobuna and 11 gengoroubuna
specimens caught using set-nets in the lake’s south basin were surgically fitted with acoustic transmitters and then released.
Signals from the fishes were recorded by 23 receivers installed around the lake. Between April and June 2007, the first spawning
season after release, signals were received from all tagged fishes. Thereafter, until the second spawning season, signals
were collected from 26 and 45% of released nigorobuna and gengoroubuna individuals, respectively. Seasonal habitat preferences
for these species were studied by distance-based analysis. The analysis revealed that nigorobuna tended to stay near their
spawning area in the south basin of the lake throughout the year, whilst gengoroubuna tended to show a seasonal migration
pattern between the north and south basins. After the spawning season, the latter species migrated to the north basin where
it remained until the next spawning season, when it returned to the south basin. This is the first report of seasonal migration
of nigorobuna and gengoroubuna in Lake Biwa. |
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