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東北海区北部海域におけるゴマサバについての二・三の生物学的観察
https://fra.repo.nii.ac.jp/records/2007251
https://fra.repo.nii.ac.jp/records/2007251787b633c-348d-4fa0-ba9d-9b8618b251fb
| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||||
|---|---|---|---|---|---|---|---|---|
| 公開日 | 2024-06-10 | |||||||
| タイトル | ||||||||
| タイトル | 東北海区北部海域におけるゴマサバについての二・三の生物学的観察 | |||||||
| 言語 | ja | |||||||
| 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 |
飯塚, 景記
× 飯塚, 景記
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| 抄録 | ||||||||
| 内容記述タイプ | Abstract | |||||||
| 内容記述 | Based chiefly on samples collected from the waters off northern Honshu and southern Hokkaido between 1969 to 1977, the author has compared identification characteristics between the spotted mackerel, Pneumatophorus japonicus tapeinocephalus (BLEEKER), and the common mackerel, Pneumatophorus japonicus japonicus (HOUTTUYN). In addition yearly variation in geographical distribution of these species as well as age composition of the commercial catch have been studied. Identification: Spines of the first dorsal fin appear to be more closely spaced in spotted mackerel than in common mackerel. A statistically significant difference of 0.5 mm has been obtained through regressional analysis of inter-spine space on fork length of spotted mackerel (ranging from 13 cm to 29 cm) as compared to common mackerel (11 cm to 37 cm). Thus the inter-spine space can be used for easy discrimination of the two species. Geographical distribution: Fishermen deal with the two mackerel species in a lump, and the fishes are not separately recorded in the fishery statistics. However, field surveys have shown that spotted mackerel have been more frequently found in recent years than before. For instance, only 14 individuals of the species were observed in 1969 while 172 specimens were identified in 1976. It is probable that since 1970 the stock size of the species has been on the increase in the waters adjacent to Hachinohe. Purse seiners, set net operations and gill netters catch this species in the warmer months from June to October. In addition, a limited quantity of spotted mackerel are taken by Danish seiners in winter months off Hachinohe. About ninty percent of spotted mackerel specimens have been collected from coastal waters along an area extending 90 km from Hachinohe southward to Fudai. The species is generally scarce in the fishing grounds for common mackerel extending northeastward to eastern Hokkaido. In September 1977, however, a number of spotted mackerel were found to be mixed in a catch of common mackerel taken from the fishing ground off Hachinohe. Age composition: Scale reading of samples indicates that the majority of the specimens are 0- and I-age, with a few II-age and older fish. Spotted mackerel of 0-age which migrated into the study area were caught in combination with a 0-age group belonging to an early brood of common mackerel. In 1975, this 0-age group of common mackerel were more abundant and were more widely distributed in the northern part of the study area than at any other year during the study period. In addition, a great number of spotted mackerel were observed with them. These observations suggest that it is necessary to delineate the route of migration and the spawning ground of the spotted mackerel. It is also extremely important to reconsider our present knowledge on the natal and early breeding ground of the common mackerel. | |||||||
| 言語 | en | |||||||
| 抄録 | ||||||||
| 内容記述タイプ | Abstract | |||||||
| 内容記述 | 1964年以来,著者は東北北部海域に出現するゴマサバの資料を蓄積してきたが,主として1969~'76年の8年間の資料を解析した結果から得た知見を報告する.1) マサバとゴマサバの第1背鰭の棘間の広狭に着眼し,体長と第1背鰭基底長/棘数との関係から容易に両者の判別ができる.この方法によると従来の判別法(棘数·斑点等)での中間型も識別できる.2) 1964~'76年に得たゴマサバ標本中の約90%が八戸,岩手県北部沿岸域で採集され,道東,八戸沖で多獲されている)マサバにはほとんどゴマサバが混入していなかった.しかし,1977年9月の八戸沖マサバ漁獲物(Ⅰ年魚)の中に,ゴマサバが高い頻度で出現し,その混獲率も高かった.今後,この海域のゴマサバの出現状況に注意する必要がある.3) 1969年頃からゴマサバの出現頻度が多くなり,マサバとの混獲率も増加している.混獲魚種はマサバ,カタクチイワシが主体であるが,イワシ,サンマ等も若干出現した.1971,'73年にはゴマサバ単独群も出現したが,全体としてマサバとの混獲率は1~10%が主体である.なお,1975,'76年の3月には八戸沖でマサバ越冬群にまじってゴマサバが出現している.4) ゴマサバの年齢構成は0年魚,Ⅰ年魚が大部分で,I年魚以上は少ない.経年的はみると,1969,'70,'74,’75年が0年魚主体Ⅰ年魚群,1971,'72,’73年がⅠ年魚主体0年魚群で,年によってどちらかの年齢群が主体になるが,傾向的な変動は認められない.5) ゴマサバ0年魚群は,例年7~11月に主としてマサバ0年魚早期発生群あるいはⅠ年魚にまじって出現する.とくに1975年は早期発生群の出現が比較的多く,その中に混入するゴマサバの出現も多かった.ゴマサバの起源,回遊経路の究明と共に,マサバ早期発生群の起源についても,今後の検討が必要となろう. | |||||||
| 言語 | ja | |||||||
| 書誌情報 |
ja : 東北区水産研究所研究報告 en : Bulletin of Tohoku Regional Fisheries Research Laboratory 巻 39, 号 tnf_k_39_11, p. 11-20, ページ数 10, 発行日 1978-03 |
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| 出版者 | ||||||||
| 出版者 | 東北海区水産研究所 | |||||||
| 言語 | ja | |||||||
| 出版者 | ||||||||
| 出版者 | Tohoku Regional Fisheries Research Laboratory | |||||||
| 言語 | en | |||||||
| ISSN | ||||||||
| 収録物識別子タイプ | PISSN | |||||||
| 収録物識別子 | 0049-402X | |||||||
| 書誌レコードID | ||||||||
| 収録物識別子タイプ | NCID | |||||||
| 収録物識別子 | AN00167637 | |||||||
| 情報源 | ||||||||
| 識別子タイプ | Local | |||||||
| 関連識別子 | tnf_k_39_11 | |||||||
| 関連サイト | ||||||||
| 識別子タイプ | URI | |||||||
| 関連識別子 | https://agriknowledge.affrc.go.jp/RN/2010174056 | |||||||
| 言語 | ja | |||||||
| 関連名称 | 日本農学文献記事索引(agriknowledge) | |||||||
