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本邦産カタクチイワシの研究-1 : 種族的研究(1)

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Title: 本邦産カタクチイワシの研究-1 : 種族的研究(1)
Other Titles: Studies on the Japanese Anchovy I. Racial Study (1)
Authors: 田村, 修
Authors (alternative): Tamura, Osamu
Issue Date: 31-May-1955
Publisher: 長崎大学水産学部
Citation: 長崎大学水産学部研究報告, v.3, pp.99-106; 1955
Abstract: Every types of the vertebral compositions of anchovies caught in the eastern and the southern region in 1951 were analysed and compared with each other using the data reported by each Regional Fisheries Research Laboratory. The method to analyse types is the same as I reported lately on the stock of Japanese sardine. 1. All the fishes of A type (AP and AD) having a high average value are the fishing object in spite of any ages 0-, 1- and 2 years. 2. If the body length of 0-year fish (AD type) is monthly compared, there are 2 modes and one of them indicates the spring spawner while the other shows summer spawner in the southern region. The eastern region has only the latter mode. 2 groups in one type can be recognized which have the remarkably different spawning temperatures among the former. This fact means to be a genotype, doesn't it? 3. AP type and AD type appear in April and May as a smaller shape in the southern region. This smaller shape comes up north and becomes larger and appears in July in the eastern region. The resources of A type will be derived from the spawning in the southern region. 4. The spawning season in the southern region can be infered from the spawning data. The spawning season and the AD, CD types perfectly coincide with the formula of vertebral mean=46.46-0.063t 5. The vertebral mean of the BD, IV D and II P types that the 0-year fish have in the eastern region is too low. That will be required to consider over again. / 昭和26年産の南海区・東海区水研のカタクチイワシ Engraulis japonicusの脊椎骨組成の資料を使用し,X2法により各類型を求めて比較した. 1.脊椎骨組成の資料の漁獲物資料に対する比は,東海区では巾着で43%,船曳で49%, 南海区では巾着17%,船曳は29%である. 2.巾着・曳網漁獲物の何れにも共通に,叉0,1,2年魚に共通して大きい資源は,平均値の高いA型である. 3.当才魚(0年魚)のADの成長度を両海区で比較すると,南海区には springs pawnerと推定されるモードと,summer spawnerと推定されるモードがあるが,東海区はsummer spawnerのみである.同類型中に著しく産卵期・水温を異にするものが見られるのは,或はgenotypeの優勢の現象かも知れない. 4.両漁具による漁獲資料A型は共に(ADとAP),先ず4・5月に南海区に小型として出現,之が北上して東海区に7月頃から出現するから,A類型は南海区で産卵したものではなかろうか. 5.南海区水研の浮卵数調査による推定産卵盛期(3・4月と7・8月)とAD,CDとは 脊椎骨平均=46.46-0.063t式によく一致する. 6.東海区の産卵期は浮卵数調査資料だけからは推定不確実であろう. 7.東海区の0年魚BD,IVD,IIPの平均脊椎骨数は低すぎるから,之は再検討を要する.
URI: http://hdl.handle.net/10069/32052
ISSN: 05471427
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:第3号

Citable URI : http://hdl.handle.net/10069/32052

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