Estimation of spawning population of pond smelt Hypomesus nipponensis by the egg production method in Lakes Shinji and Nakaumi, Japan
Pond smelt catch in Lake Shinji has been at a low level since 1994. The population has not yet recovered, nevertheless gill-net catch has been banned in spawning season at the river mouth of Hii River, the major spawning ground. We carried out population estimation by the egg production method for f...
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| Published in | Bulletin of the Japanese Society of Fisheries Oceanography Vol. 80; no. 2; pp. 124 - 128 |
|---|---|
| Main Authors | , |
| Format | Journal Article |
| Language | Japanese |
| Published |
The Japanese Society of Fisheries Oceanography
25.05.2016
一般社団法人 水産海洋学会 |
| Subjects | |
| Online Access | Get full text |
| ISSN | 0916-1562 2435-2888 |
| DOI | 10.34423/jsfo.80.2_124 |
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| Abstract | Pond smelt catch in Lake Shinji has been at a low level since 1994. The population has not yet recovered, nevertheless gill-net catch has been banned in spawning season at the river mouth of Hii River, the major spawning ground. We carried out population estimation by the egg production method for fundamental information on further stock management policy. Pond smelt attaches their adhesive eggs to sands or gravels at the bottom. Mean number of pond smelt eggs sampled from 0–6 cm layer of sandy bottom was 88.4 per unit area of 0.05 m2 by egg sampling survey in the 2004 spawning season. Total area of major spawning ground in Hii River was 242,987 m2. Total number of eggs in 0–6 cm layer of sandy bottom was estimated as 429,601,016. Number of spawning females was calculated as 39,247 individuals, and biomass of both sexes was estimated as 861 kg. Moreover, 2.25 fold eggs were deposited to a depth of 0–15 cm layer compared with 0–6 cm. Spawning population was estimated as 1,937 kg, using the value. |
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| AbstractList | Pond smelt catch in Lake Shinji has been at a low level since 1994. The population has not yet recovered, nevertheless gill-net catch has been banned in spawning season at the river mouth of Hii River, the major spawning ground. We carried out population estimation by the egg production method for fundamental information on further stock management policy. Pond smelt attaches their adhesive eggs to sands or gravels at the bottom. Mean number of pond smelt eggs sampled from 0–6 cm layer of sandy bottom was 88.4 per unit area of 0.05 m2 by egg sampling survey in the 2004 spawning season. Total area of major spawning ground in Hii River was 242,987 m2. Total number of eggs in 0–6 cm layer of sandy bottom was estimated as 429,601,016. Number of spawning females was calculated as 39,247 individuals, and biomass of both sexes was estimated as 861 kg. Moreover, 2.25 fold eggs were deposited to a depth of 0–15 cm layer compared with 0–6 cm. Spawning population was estimated as 1,937 kg, using the value. Pond smelt catch in Lake Shinji (Japan) has been at a low level since 1994. The population has not yet recovered, nevertheless gill-net catch has been banned in spawning season at the river mouth of Hii River, the major spawning ground. We carried out population estimation by the egg production method for fundamental information on further stock management policy. Pond smelt attaches their adhesive eggs to sands or gravels at the bottom. Mean number of pond smelt eggs sampled from 0-6 cm layer of sandy bottom was 88.4 per unit area of 0.05 m super(2) by egg sampling survey in the 2004 spawning season. Total area of major spawning ground in Hii River was 242,987 m super(2). Total number of eggs in 0-6 cm layer of sandy bottom was estimated as 429,601,016. Number of spawning females was calculated as 39,247 individuals, and biomass of both sexes was estimated as 861 kg. Moreover, 2.25 fold eggs were deposited to a depth of 0-15 cm layer compared with 0-6 cm. Spawning population was estimated as 1,937 kg, using the value. Pond smelt catch in Lake Shinji has been at a low level since 1994. The population has not yet recovered, nevertheless gill-net catch has been banned in spawning season at the river mouth of Hii River, the major spawning ground. We carried out population estimation by the egg production method for fundamental information on further stock management policy. Pond smelt attaches their adhesive eggs to sands or gravels at the bottom. Mean number of pond smelt eggs sampled from 0–6 cm layer of sandy bottom was 88.4 per unit area of 0.05 m2 by egg sampling survey in the 2004 spawning season. Total area of major spawning ground in Hii River was 242,987 m2. Total number of eggs in 0–6 cm layer of sandy bottom was estimated as 429,601,016. Number of spawning females was calculated as 39,247 individuals, and biomass of both sexes was estimated as 861 kg. Moreover, 2.25 fold eggs were deposited to a depth of 0–15 cm layer compared with 0–6 cm. Spawning population was estimated as 1,937 kg, using the value. 宍道湖のワカサギは1994年以来不漁が続いており，宍道湖漁業協同組合は産卵親魚の保護策として，主な産卵場である斐伊川の河口域を，産卵期に刺網操業禁止域としている．しかし，資源はいまだに回復しておらず今後，さらなる対策を検討する必要がある．その基礎資料とするため，資源量推定を実施した．ワカサギは砂礫に付着卵を生みつけるため，産卵数を調べることによって親魚の資源量を推定することが可能である．そこで，本研究では，卵数法を用いて資源量の推定を行った．2004年の産卵期に斐伊川内の主要産卵場の面積は242,987 m2，底質の深さ6 cmまでの単位面積（0.05 m2）当たりの卵数の平均値は88.4粒であり，深さ6 cmまでの産卵量は429,601,016粒と推定された．これより，産卵雌親魚資源尾数は39,247尾，雌雄の資源量は861 kgと算出された．しかし，底質を層別に調べた結果，ワカサギの卵は底質の深さ15 cmまで存在し，深さ6 cmまでの2.25倍であった．この値で補正すると産卵親魚資源量は1,937 kgと推定された． |
| Author | FUJIKAWA, Yuji IMAI, Chifumi |
| Author_FL | 藤川 裕司 今井 千文 |
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| DocumentTitleAlternate | 卵数法を用いた宍道湖，中海におけるワカサギ親魚の資源量推定 |
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| EISSN | 2435-2888 |
| EndPage | 128 |
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| GeographicLocations | INW, Japan, Shimane Prefecture, Nakaumi L INW, Japan, Shimane Prefecture, Shinji L |
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| References | 川島隆寿（1989）宍道湖におけるワカサギ及びシラウオ資源の変動． 島根県水産試験場研究報告，6, 69–80. Berg, L. S. （1962） Freshwater fishes of the U.S.S.R. and adjacent countries, Academy of Sciences of the U.S.S.R. Zoological Institute, 475–477. 藤川裕司・持田和男・江角陽司・大北晋也 （2004） 宍道湖におけるワカサギ不漁原因の検討とワカサギ，シラウオ資源のモニタリング．平成14年度島根県内水面水産試験場事業報告，5, 31–42. 浜田啓吉 （1980） ワカサギ―弱いものは強い．「日本の淡水生物」 川合禎次，川那部浩哉，水野信彦編，東海大学出版会，東京，49–55. 鳥澤 雅（1999）網走湖産ワカサギの生活史多型分岐と資源変動機構． 北海道立水産試験場研究報告，56, 1–117. 藤川裕司・内田 浩（2015）宍道湖における2000–2005年漁期の刺網によるフナ類，シラウオ，スズキ，ワカサギの漁獲量推定．島根県水産技術センター研究報告，8, 51–57. 白石芳一（1960）ワカサギの水産生物学的ならびに資源学的研究．淡水区水産研究所研究報告，10, 1–263. 藤川裕司・片山知史（2014）宍道湖，中海におけるワカサギの産卵場と産卵期．水産増殖，62, 375–384. 稲葉伝三郎（1967）ワカサギの増殖．「淡水増殖学」．恒星社厚生閣，東京，254–261. 藤川裕司 （2004） 宍道湖刺網漁業実態調査．平成14年度島根県内水面水産試験場事業報告，5, 3–9. 冨永 敦（2004）冬季の張網入網量データを用いたワカサギ漁獲量の予測．茨城県内水面水産試験場調査研究報告，39, 59–66. 藤川裕司・森山 勝・大北晋也（2003）有用水産動物生態調査（ワカサギ，シラウオ）．平成13年度島根県内水面水産試験場事業報告，4, 95–111. 隆島史夫（1982）発生．「淡水養殖技術」野村 稔編，恒星社厚生閣，東京，37–41. 七条喜一郎・松本 勉・吉田 勲・奥村武信・斉藤俊之・竹内 崇・原田悦守・鈴木 實（2000）ワカサギの産卵行動と受精卵に関する研究．鳥大農研報，53, 89–93. 七条喜一郎・松本 勉・斉藤俊之・吉田 勲・竹内 崇・原田悦守・鈴木 實（2001）ワカサギの新産卵法に関する研究．鳥大農研報，54, 71–76. 今井千文・楫取和明・田島良博・中村元彦・内山雅史・山田浩且（1998）水温情報を用いた卵数法によるカタクチイワシ本州太平洋系群の資源量推定．水産海洋研究，62, 356–368. スネデカー・コクラン（1972）標本抽出の設計と分析．「統計的方法」畑村又好，奥野忠一，津村善郎共訳，岩波書店，東京，467–498. 渡邊千夏子・花井孝之・目黒清美・荻野隆太・木村 量（1999）1日当たり総産卵量によるマサバの資源量推定．日水誌，65, 695–702. 田中昌一（1985）産卵量からの資源量の推定．「水産資源学総論」．恒星社厚生閣，東京，271–279. 栗原伸夫（1982）ワカサギ．「淡水養殖技術」野村 稔編，恒星社厚生閣，東京，328–335. 落合 明・田中 克（1986）ワカサギ．「魚類学下」．恒星社厚生閣，東京，477–483. 片山知史（1996）小川原湖のワカサギ個体群に関する資源生態学的研究．東北大学学位審査論文，171 pp 高安克己・大西郁夫・徳岡隆夫（1985）宍道湖のおいたち．「宍道湖の自然」佐藤仁志編，山陰中央新報社，島根県，98–105. |
| References_xml | – reference: 稲葉伝三郎（1967）ワカサギの増殖．「淡水増殖学」．恒星社厚生閣，東京，254–261. – reference: 片山知史（1996）小川原湖のワカサギ個体群に関する資源生態学的研究．東北大学学位審査論文，171 pp． – reference: 渡邊千夏子・花井孝之・目黒清美・荻野隆太・木村 量（1999）1日当たり総産卵量によるマサバの資源量推定．日水誌，65, 695–702. – reference: 今井千文・楫取和明・田島良博・中村元彦・内山雅史・山田浩且（1998）水温情報を用いた卵数法によるカタクチイワシ本州太平洋系群の資源量推定．水産海洋研究，62, 356–368. – reference: 落合 明・田中 克（1986）ワカサギ．「魚類学下」．恒星社厚生閣，東京，477–483. – reference: 藤川裕司・片山知史（2014）宍道湖，中海におけるワカサギの産卵場と産卵期．水産増殖，62, 375–384. – reference: 川島隆寿（1989）宍道湖におけるワカサギ及びシラウオ資源の変動． 島根県水産試験場研究報告，6, 69–80. – reference: 冨永 敦（2004）冬季の張網入網量データを用いたワカサギ漁獲量の予測．茨城県内水面水産試験場調査研究報告，39, 59–66. – reference: 隆島史夫（1982）発生．「淡水養殖技術」野村 稔編，恒星社厚生閣，東京，37–41. – reference: 七条喜一郎・松本 勉・吉田 勲・奥村武信・斉藤俊之・竹内 崇・原田悦守・鈴木 實（2000）ワカサギの産卵行動と受精卵に関する研究．鳥大農研報，53, 89–93. – reference: 藤川裕司 （2004） 宍道湖刺網漁業実態調査．平成14年度島根県内水面水産試験場事業報告，5, 3–9. – reference: Berg, L. S. （1962） Freshwater fishes of the U.S.S.R. and adjacent countries, Academy of Sciences of the U.S.S.R. Zoological Institute, 475–477. – reference: スネデカー・コクラン（1972）標本抽出の設計と分析．「統計的方法」畑村又好，奥野忠一，津村善郎共訳，岩波書店，東京，467–498. – reference: 鳥澤 雅（1999）網走湖産ワカサギの生活史多型分岐と資源変動機構． 北海道立水産試験場研究報告，56, 1–117. – reference: 藤川裕司・内田 浩（2015）宍道湖における2000–2005年漁期の刺網によるフナ類，シラウオ，スズキ，ワカサギの漁獲量推定．島根県水産技術センター研究報告，8, 51–57. – reference: 藤川裕司・森山 勝・大北晋也（2003）有用水産動物生態調査（ワカサギ，シラウオ）．平成13年度島根県内水面水産試験場事業報告，4, 95–111. – reference: 七条喜一郎・松本 勉・斉藤俊之・吉田 勲・竹内 崇・原田悦守・鈴木 實（2001）ワカサギの新産卵法に関する研究．鳥大農研報，54, 71–76. – reference: 白石芳一（1960）ワカサギの水産生物学的ならびに資源学的研究．淡水区水産研究所研究報告，10, 1–263. – reference: 高安克己・大西郁夫・徳岡隆夫（1985）宍道湖のおいたち．「宍道湖の自然」佐藤仁志編，山陰中央新報社，島根県，98–105. – reference: 田中昌一（1985）産卵量からの資源量の推定．「水産資源学総論」．恒星社厚生閣，東京，271–279. – reference: 浜田啓吉 （1980） ワカサギ―弱いものは強い．「日本の淡水生物」 川合禎次，川那部浩哉，水野信彦編，東海大学出版会，東京，49–55. – reference: 栗原伸夫（1982）ワカサギ．「淡水養殖技術」野村 稔編，恒星社厚生閣，東京，328–335. – reference: 藤川裕司・持田和男・江角陽司・大北晋也 （2004） 宍道湖におけるワカサギ不漁原因の検討とワカサギ，シラウオ資源のモニタリング．平成14年度島根県内水面水産試験場事業報告，5, 31–42. |
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| Snippet | Pond smelt catch in Lake Shinji has been at a low level since 1994. The population has not yet recovered, nevertheless gill-net catch has been banned in... Pond smelt catch in Lake Shinji (Japan) has been at a low level since 1994. The population has not yet recovered, nevertheless gill-net catch has been banned... |
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| SubjectTerms | Brackish egg production estimation of spawning population Hypomesus nipponensis pond smelt |
| Title | Estimation of spawning population of pond smelt Hypomesus nipponensis by the egg production method in Lakes Shinji and Nakaumi, Japan |
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| ispartofPNX | Bulletin of the Japanese Society of Fisheries Oceanography, 2016/05/25, Vol.80(2), pp.124-128 |
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