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Bull. Jpn. Soc. Fish. Oceanogr. 68(1),
Page 27-35
, 2004 |
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Estimation of Distribution
Boundary between two Sandfish Arctoscopus japonicus Stocks
in the Sea of Japan off Honshu, Japan using Density Indices
Kyuji WATANABE †1, Hideki
SUGIYAMA2, Shigeo SUGISHITA2, Naoki SUZUKI3
and Kazumi SAKURAMOTO3
1 Department of Fisheries Resource Management, Tokyo University
of Fisheries, 4Ð5Ð7 konann, Minato-ku, Tokyo 108-8477,
Japan 2 Akita Prefectural Fisheries Promotion Center, Oga-shi,
Akita 010-0531, Japan 3 Department of Ocean Sciences, Tokyo Univsersity of Marine Science and Technology, 4-5-7 Konan, Minato-ku, Tokyo 108-8477, Japan †e-mail: rd01403@cc.tokyo-u-fish.ac.jp
It has been known that there are two main spawning grounds of
sandfish Arctoscopus japonicus in the Sea of Japan off
Honshu, Japan, and the Korea Peninsula: one located off the
coast of Akita Prefecture, Honshu, Japan, and the other located
on the east coast of Korea. This paper investigated the distribution
of these two stocks originating from the two spawning grounds
using catches, density indices in 13 areas in the Sea of Japan
based on catch per unit effort (CPUE) data and length frequency
distributions of female in the offing of Akita Prefecture. The
results were as follows: (1) in the offing of Akita Prefecture,
monthly CPUE showed two peaks in April and October and very
low values in summer; (2) the density indices showed that fish
were concentrated near the spawning grounds in October to December;
(3) in the offing of Akita Prefecture, the length frequency
distributions indicated that 1-year old fish recruited from
March to April; and (4) principal component analysis for the
annual fluctuation in the density indices in each area indicated
that the stock originating in Akita was distributed from the
offing of Akita Prefecture to the offing of Wakasa, and the
stock originating in Korea was distributed from the east coast
of Korea to the offing of Noto.
Key words: Arctoscopus japonicus,
density index, Korea, migration, principal component analysis,
sandfish, Sea of Japan, stock |
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