耳石輪紋によるワカサギの日齢査定
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- 大浜 秀規
- 山梨県魚苗センター
書誌事項
- タイトル別名
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- Age determination of Japanese smelt with daily otolith increments.
- ジセキ リンモン ニ ヨル ワカサギ ノ ニチレイ サテイ
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抄録
Daily otolith increments of the Japanese smelt Hypomesus transpacificus nipponensis, were validated to establish the age determination method for the population study and the early life history of this species.<br> Artificially fertilized Japanese smelt was sequentially sampled from the age of 0 day to 145 days and the number of growth increments on sagittae was counted. The sagittal radius at hatching was about 10μm regardless of water temperature: i.e.9.81±0.73μm at 19.5°C, and 10.03±0.82μm at 10.0°C.The relation between the days after hatching (X) and the number of growth increments on sagittae over 10μm in radius (Y) was expressed by the linear regression of Y=0.966X+0.389(r=0.992, n=96, P<0.01).The slope is not significantly different from 1 (p>0.1), and thus the daily deposition of sagittal increments was confirmed. The maximum deviation from the mean day was 5 days (4.5%) at 145 days.<br> The ageing rate (No. fish successfully aged/No. fish examined) gradually decreased to 50% at 145 days after hatching. Consequently, this method of age determination can be applicable for fish younger than 145 days of the age.
収録刊行物
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- 日本水産学会誌
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日本水産学会誌 56 (7), 1053-1057, 1990
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
- 1390282681388078592
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- NII論文ID
- 130001545060
- 10004769018
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- NII書誌ID
- AN00193422
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- ISSN
- 1349998X
- 00215392
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- NDL書誌ID
- 3683620
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- IRDB
- NDL
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