著者

松浦 啓一 坂井 恵一 吉野 哲夫

出版者

日本魚類学会

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.40, no.3, pp.p372-376, 1993-11

著者

加藤 文男

出版者

日本魚類学会

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.22, no.3, pp.183-185, 1975-12-29 (Released:2011-02-23)

参考文献数

7

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Four large specimens of freshwater salmons, 365 to 567 mm in total length, were collected in Kuzuryu Dam, and in the upper streams of Takinami River and Kuroko River, Fukui Prefecture.These specimens are two or three years old, and have higher depth of body than that of the salmonid fish“Biwamasu” (lacustrine form) in Lake Biwa, and the crimson spots on both sides of body.These spots are similar to those of the smaller“Amago”, but differ from those of the“Biwamasu”.The number of transverse scales of the present mateial is more than those of the“Biwamasu”.From the comparison described above and the fact that the“Amago”of Oncorhynchus rhodurus Jordan and McGregor was introduced artificially into the upper streams of Kuzuryu River, Takinami River and Kuroko River before, the author identified the present material as the“Amago”O.rhodurus which inhabits the rivers.

著者

桑原 雅之 井口 恵一朗

出版者

日本魚類学会

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.54, no.1, pp.15-20, 2007-05-25 (Released:2011-06-08)

参考文献数

39

被引用文献数

1

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Salmon (Oncorhynchus masou) of uncertain subspecific identity migrating upstream in inflowing rivers around Lake Biwa much earlier than the main autumn migration of Biwa salmon (O. m. subsp.) raised the question of whether or not summer migrating Biwa salmon individuals might be mixed with the very similar redspotted masu salmon (O. m. ishikawae). Accordingly, 17 individuals of summer migrating salmon were captured from inflowing streams of Lake Biwa from May to July in 1998 and 1999, and their morphological characters and mitochondrial DNA analyzed. Twelve individuals were found to be Biwa salmon and three to be redspotted masu salmon, based on both morphological and DNA characters. The remaining two individuals could not be identified owing to discordant the morphological and molecular characters. The study confirmed the occurrence of summer upstream migration in Biwa salmon. Although the majority of Biwa salmon migrate upstream just before the breeding season in autumn, the possibility exists that summer migrating individuals might contribute to the genetic diversity of the Biwa salmon population.

著者

前川 光司

出版者

日本魚類学会

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.20, no.4, pp.245-247, 1973-12-31 (Released:2011-02-23)

参考文献数

8

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The sea-run form of the Dolly Varden (Salvelinns malma) has not been recorded from Hokkaido, excepting two anadromous males (Flikita, 1962; Ishigaki, 1967).On April 23rd, 1972, a silvery specimen of the Dolly Varden, immature female and 153.1 mm in total length, was collected from the Shoji River in the Shiretoko Peninsula, northeastern Hokkaido. It was identified as a smolt of the Dolly Varden, and is a new record from Hokkaido. The tip of the dorsal fin was jet black and posterior margin of the caudal fin was faintly edged with black.No significant differences were recognized.in the number of vertebrae, pored scales, pyloric caeca, and gill rakers, between the smolt and river resident form from the same district.It was considered, from the point of geographical variation of the fish and geographical aspects of the Shiretoko district, that the fish might have hatched in the Shoji River.

著者

前川 光司

出版者

日本魚類学会

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.32, no.3, pp.355-358, 1985-11-28 (Released:2010-06-28)

参考文献数

10

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982年と1983年に, 然別湖産オショロコマ (ミヤベイワナ) が多回産卵することを利用して, タッグ装着による母川回帰性を調べた。前年に湖上した同じ河川に翌年再び湖上する個体の比率は極めて高かった。また, 湖中で捕獲し標識後湖に再放流した個体の各河川への瀕上率は, 各河川の総淵上数の比率とほぼ比例していた.このことから, このオショロコマは然別湖水系内で母川回帰することが示唆された。

著者

明仁親王 目黒 勝介

出版者

日本魚類学会

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.27, no.3, pp.p215-236, 1980-11

著者

新井 良一 小林 弘

出版者

日本魚類学会

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.20, no.1, pp.1-6, 1973-06-20 (Released:2010-06-28)

参考文献数

25

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日本産ハゼ科魚類13種類の核型をコルヒチン処理した魚の鰐と消化管で観察した.体細胞の染色体数は2n=40, 2n=44, 2n=46, 2n=48の4型で, 各染色体の形態については, (1) すべての染色体がsubtelocentrics もしくはacrocentricsのものと, (2) metacentrics, submetacentricsおよびsubtelocentricsもしくはacrocentricsからなるものとが観察された.(1) のグループに属するものは, アシシロハゼAboma lactipes (Hilgendorf), 2n=40, マハゼAcanthogobius flayimanus (Temminck et Schlegel), 2n=44, ヨシノボリRhinogobius bruneus (Temmincket Schlegel), 2n=44, カワヨシノボリRhinogobiusflumineus (Mizuno), 2n=44, アゴノ・ゼChasmichthysdolichognathus (Hilgendorf), 2n=44, アベハゼMugilogobius abei (Jordan et Snyder), 2n=46, クモハゼBathygobius fuscus (Rüppell), 2n=48の7種類で, (2) のグループに属するハゼは, キヌバリPterogbius elapoides (Günther), 2n=44, ミミズハゼLuciogobius guttatus Gill, 2n=44, ヌマチチブTridentiger obscurus brevispinis Katsuyama, Aralet Nakamura, 2n=44, シマハゼTridentiger trigonocephalus (Gill), 2n=44, ウキゴリChaenogobiusannularis Gill, 2n=44, トビハゼPeriophthalmuscantonensis (Osbeck), 2n=46の6種類であった.

著者

金柱 陽子 酒井 治己 安田 富士郎

出版者

日本魚類学会

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.27, no.3, pp.p191-198, 1980-11

著者

川瀬 裕司

出版者

日本魚類学会

雑誌

魚類學雜誌 (ISSN:00215090)

巻号頁・発行日

vol.45, no.1, pp.1-19, 1998-05-25

被引用文献数

3

著者

松本 清二 岩田 勝哉

出版者

The Ichthyological Society of Japan

雑誌

魚類學雜誌 (ISSN:00215090)

巻号頁・発行日

vol.44, no.1, pp.35-41, 1997-05-26

被引用文献数

1

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Paternal egg guarding and mouthbrooding of larvae and juveniles were observed in the swamp-eel, <I>Monopterus albus</I>. In aquaria, the male guarded and cared for eggs in the bubble nest floating inside a plastic tube (5 cm in dia-meter, 50 cm in length). It was suggested that spawning and fertilization occurred outside the nest tube, and that the male carried the fertilized eggs (ca. 4 mm in diameter) in his mouth and inserted them into the bubble mass. Until the hatching of larvae (7-8 days after spawning), the male frequently added fresh bubbles into the bubble mass. As soon as the larvae (18-21 mm in TL) hatched and emerged from the bubble nest, the male sucked them into his mouth. Fifty juveniles (32-37 mm in TL) and two yolk-sac larvae (22 mm in TL) were released from the mouth of a male collected from a natural habitat. Those juveniles were retrieved by the male, some of them voluntarily returning to the male's mouth. The mouthbrooding male frequently performed pumping behavior (i.e., inflating and deflating the buccopharyngeal cavity), thereby acquiring to take fresh air. Eggs removed from the bubble nest successfully hatched only when directly exposed to aeration. In addition, only about 40% of the hatched larvae survived more than 10 days when they were kept in well-aerated water without the male parent. These suggest that both the bubble nest and mouthbrooding are indispensable for successful development and survival of eggs and larvae in this species, which inhabits swamps and paddy fields.