Age Structure and Mortality of the Sunray Surf Clam Mactra chinensis off Tomakomai,Southwest Hokkaido
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- Sakurai Izumi
- Hokkaido Central Fisheries Experimental Station
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- Kurata Mamoru
- Hokkaido Abashiri Fisheries Experimental Station
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- Abe Eiji
- Hokkaido Kushiro Fisheries Experimental Station
書誌事項
- タイトル別名
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- Age Structure and Mortality of the Sunray Surf Clam <i>Mactra chinensis</i> off Tomakomai, Southwest Hokkaido
- Age Structure and Mortality of the Sunr
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The age structure and seasonal changes in mortality of the sunray surf clam Mactra chinensis older than age at recruitment (3 years) were studied using data collected from April 1991 to February 1992 off Tomakomai, southwest Hokkaido, Japan. Wide fluctuations in the number of recruits of various ages were clearly observed and the estimated density of the recruits was ranged from 0.6 to 4.6 ind./m2. The highest monthly mortality of 3-7-year-old clams occurred in the fall, whereasthe mortality of those aged 8 years and older was constant throughout the year. The estimated mean annual mortality rates of 3-9-and 10-year-old clams were 42.9 and 76.0%, respectively. It was considered thatthe mortality would appear to be due to the digging out from the surface of the bottom and subsequent dispersion of the clam as a result of wave-sweep action in the fall, whereas the highmortality of clams aged 8 years and older was a result of physiological longevity. The most effective utilizationof the clam stock in this area is discussed.
収録刊行物
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- Fisheries science
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Fisheries science 62 (2), 168-172, 1996
公益社団法人 日本水産学会
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詳細情報 詳細情報について
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- CRID
- 1390001204428862592
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- NII論文ID
- 130003902871
- 10004865281
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- NII書誌ID
- AA10993718
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- NDL書誌ID
- 3951185
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- ISSN
- 09199268
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可