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  3. 瀬戸内海区水産研究所

飼育実験によるカタクチイワシの雌1尾当り年間産卵数の推定

https://fra.repo.nii.ac.jp/records/2003288
https://fra.repo.nii.ac.jp/records/2003288
6ba1f1d1-417d-4850-ac71-169977dfe309
Item type 紀要論文 / Departmental Bulletin Paper(1)
公開日 2024-04-25
タイトル
タイトル 飼育実験によるカタクチイワシの雌1尾当り年間産卵数の推定
言語 ja
タイトル
タイトル Number of Eggs of Japanese Anchovy Produced per Female per Year Estimated by a Rearing Experiment
言語 en
言語
言語 jpn
資源タイプ
資源タイプ識別子 http://purl.org/coar/resource_type/c_6501
資源タイプ departmental bulletin paper
アクセス権
アクセス権 metadata only access
アクセス権URI http://purl.org/coar/access_right/c_14cb
著者 高尾, 亀次

× 高尾, 亀次

WEKO 3341

en Takao, Kameji

ja 高尾, 亀次

ja-Kana タカオ, カメジ

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岸田, 達

× 岸田, 達

WEKO 476
e-Rad_Researcher 10416034

en Kishida, Tatsu

ja 岸田, 達

ja-Kana キシダ, タツ

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上田, 和夫

× 上田, 和夫

WEKO 3354

en Ueda, Kazuo

ja 上田, 和夫

ja-Kana ウエダ, カズオ

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抄録
内容記述タイプ Abstract
内容記述 Since 1978 the Nansei Regional Fisheries Research Laboratory has estimated the abundance of adult anchovy (Engraulis japonica (HOUTTUYN)), based on the egg census, in addition to the analysis of catch and effort statistics (TAKAO 1980). The average number of eggs spawned per female is indispensable for conversion of the abundance of eggs in the sea to number of the adult anchovy that produced them. Attempt was made to determine the number of ovarian ova. The long-lasting spawning activities over nine months in the Seto Inland Sea makes it difficult to obtain the number of spawned eggs per female based on merely the counts of ovarian ova. Furthermore the number of eggs in the ovary were found differing from area to area within the distribution range of the species. The authors have commenced rearing experiments of adult anchovy in an outdoor tank of 2 × 2 × 3m to determine actual number of spawned eggs. Fish of 0-age group that hatched in the autumn 1980 were brought to the tank on 23 June 1981, and then kept until October 1982. The fish spawned continuously from late July to early November 1981 and again discharged eggs since April 1982. The death rate stayed at low-level below 0.02% per day except 15 to 18 August 1981 when over-feeding caused mass mortality of 11 to 65%. Nevertheless, the fish actively discharged eggs even on 17, 18 August just in the disastrous decrease in number. During the period of three months since late July, the average eggs production per day per female varied from one to 1, 031, and the accumulated counts reach 15, 400 eggs. A detailed observation were conducted from 19:00 on 17 August to 06:00 on 18 August. The counts for every one-hours were less than ten eggs discharged on the preceeding day before 22:00 and increased since then, having reach a peak of 1, 500 newly spawned eggs at 23:00. After midnight the eggs decreased in number, having dropped to 40 at 04:00 and about 300 at 05:00 and 06:00. The data indicate that the anchovy discharge eggs most actively at 22:00 to the midnight. The long-lasting spawning of the same school in the tank confirms that a single fish spawns more than one batch of a year, even if the activity of reproduction varies remarkably from season to season. The anchovy eggs collected by plankton nets are found most abundant in June in the nearby spawning grounds of the Hiroshima Bay. Thus the accumulated count of 15, 400 eggs per female obtained from the rearing experiment that started on 23 June is definitely an underestimate of the average fecundity of the species. Taking the seasonal change of egg abundance in the sea and the duration of the rearing experiment into account, the authors propose that a female anchovy produces about 21, 000 eggs per year.
言語 en
抄録
内容記述タイプ Abstract
内容記述 カタクチイワシ成魚の飼育実験を行い,産卵行動や産卵数について以下の結果を得た。1)飼育した成魚は前年の秋生れ群と推定される。従来,この群は発生した翌年の6,7月に産卵すると考えられていたが,秋まで産卵することが明らかになった。飼育期間中の主たる産卵時期は7月31日から11月2日までであった。2)飼育に供した群は,3ヵ月以上にわたって産卵を持続した。また集団としての産出卵数は季節によって大きく異った。3)本種の産卵時刻は22時~0時の前夜半と推定された。4)年間における雌1尾の産出卵数は21,000粒前後と推定された。
言語 ja
bibliographic_information ja : 南西海区水産研究所研究報告
en : Bulletin of the Nansei Regional Fisheries Research Laboratory

巻 15, p. 1-11, ページ数 11, 発行日 1983-03
出版者
出版者 南西海区水産研究所
言語 ja
出版者
出版者 Nansei Regional Fisheries Research Laboratory
言語 en
item_10002_source_id_9
収録物識別子タイプ PISSN
収録物識別子 0388-841X
item_10002_source_id_11
収録物識別子タイプ NCID
収録物識別子 AN00181988
情報源
識別子タイプ Local
関連識別子 nnf_k_15_1
関連サイト
識別子タイプ URI
関連識別子 https://agriknowledge.affrc.go.jp/RN/2010271217
言語 ja
関連名称 日本農学文献記事索引(agriknowledge)
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