Abstract
Local people in Oita Prefecture perform a traditional fishery called the Ishi-kura fishing method in estuaries. Ishi-kura is an underwater pile of approximately 0.5 tons of stones 15-30 cm in diameter, and wild eels dwell inside the pile and are caught using nets.We examined the relationship between Japanese eel Anguilla japonica and aquatic animals caught with an Ishi-kura net which was modified for aquatic animal research, in the Iroha and Katsura Rivers, Oita Prefecture, Japan. Based on community structure analysis, the aquatic animal community in the Ishi-kura net consisting of 54 taxonomic animals was divided into two groups by distance from the river month and substrate; the upstream group mainly contained the genus Hemigrapsus and genus Batillaria, and the downstream one predominantly contained Macrobrachium nipponense and Clithon retropicta. Based on stomach content analysis, 39 out of 79 eels consumed the same aquatic animal groups found in Ishi-kura. However, eels inhabiting downstream mainly preyed on mud shrimp, and those inhabiting upstream predominantly fed on crab, suggesting that eels may not use Ishi-kura for feeding but for living space. These findings suggest that Ishi-kura nets may be useful for monitoring eels as well as aquatic animals as their potential prey items.
| Original language | English |
|---|---|
| Pages (from-to) | 45-53 |
| Number of pages | 9 |
| Journal | Nippon Suisan Gakkaishi (Japanese Edition) |
| Volume | 84 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Jan 1 2018 |
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All Science Journal Classification (ASJC) codes
- Aquatic Science
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Japanese eel Anguilla japonica and aquatic animals collected with Ishi-kura net in the Iroha and Katsura Rivers, Oita Prefecture, Japan. / Harada, Mami; Kume, Manabu; Mochioka, Noritaka; Tamura, Yuji; Kanzaki, Toko; Hashiguchi, Shunya; Kasai, Akihide; Yamashita, Yoh.
In: Nippon Suisan Gakkaishi (Japanese Edition), Vol. 84, No. 1, 01.01.2018, p. 45-53.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Japanese eel Anguilla japonica and aquatic animals collected with Ishi-kura net in the Iroha and Katsura Rivers, Oita Prefecture, Japan
AU - Harada, Mami
AU - Kume, Manabu
AU - Mochioka, Noritaka
AU - Tamura, Yuji
AU - Kanzaki, Toko
AU - Hashiguchi, Shunya
AU - Kasai, Akihide
AU - Yamashita, Yoh
PY - 2018/1/1
Y1 - 2018/1/1
N2 - Local people in Oita Prefecture perform a traditional fishery called the Ishi-kura fishing method in estuaries. Ishi-kura is an underwater pile of approximately 0.5 tons of stones 15-30 cm in diameter, and wild eels dwell inside the pile and are caught using nets.We examined the relationship between Japanese eel Anguilla japonica and aquatic animals caught with an Ishi-kura net which was modified for aquatic animal research, in the Iroha and Katsura Rivers, Oita Prefecture, Japan. Based on community structure analysis, the aquatic animal community in the Ishi-kura net consisting of 54 taxonomic animals was divided into two groups by distance from the river month and substrate; the upstream group mainly contained the genus Hemigrapsus and genus Batillaria, and the downstream one predominantly contained Macrobrachium nipponense and Clithon retropicta. Based on stomach content analysis, 39 out of 79 eels consumed the same aquatic animal groups found in Ishi-kura. However, eels inhabiting downstream mainly preyed on mud shrimp, and those inhabiting upstream predominantly fed on crab, suggesting that eels may not use Ishi-kura for feeding but for living space. These findings suggest that Ishi-kura nets may be useful for monitoring eels as well as aquatic animals as their potential prey items.
AB - Local people in Oita Prefecture perform a traditional fishery called the Ishi-kura fishing method in estuaries. Ishi-kura is an underwater pile of approximately 0.5 tons of stones 15-30 cm in diameter, and wild eels dwell inside the pile and are caught using nets.We examined the relationship between Japanese eel Anguilla japonica and aquatic animals caught with an Ishi-kura net which was modified for aquatic animal research, in the Iroha and Katsura Rivers, Oita Prefecture, Japan. Based on community structure analysis, the aquatic animal community in the Ishi-kura net consisting of 54 taxonomic animals was divided into two groups by distance from the river month and substrate; the upstream group mainly contained the genus Hemigrapsus and genus Batillaria, and the downstream one predominantly contained Macrobrachium nipponense and Clithon retropicta. Based on stomach content analysis, 39 out of 79 eels consumed the same aquatic animal groups found in Ishi-kura. However, eels inhabiting downstream mainly preyed on mud shrimp, and those inhabiting upstream predominantly fed on crab, suggesting that eels may not use Ishi-kura for feeding but for living space. These findings suggest that Ishi-kura nets may be useful for monitoring eels as well as aquatic animals as their potential prey items.
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U2 - 10.2331/suisan.17-00032
DO - 10.2331/suisan.17-00032
M3 - Article
VL - 84
SP - 45
EP - 53
JO - Nippon Suisan Gakkaishi
JF - Nippon Suisan Gakkaishi
SN - 0021-5392
IS - 1
ER -