魚類学雑誌
Online ISSN : 1884-7374
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21 巻 , 2 号
選択された号の論文の7件中1~7を表示しています
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  • 新井 良一, 平野 宏
    21 巻 (1974 - 1975) 2 号 p. 53-60
    公開日: 2010/06/28
    ジャーナル フリー
    1973年の春と秋に沖縄県石垣島で体長30.9~171.5mmのヒレナマズ (Clarias fuscus) が採集された. ヒレナマズ科 (Clariidae) の採集記録は日本では初めてのことである.
    本種はフィリピン, 中国大陸, 台湾に広く分布するが, 近縁のClarias batrachusとのちがいにっいて従来の知見は貧弱なので, いくっかの分類形質を比較した.この結果, 腹椎骨数・背鰭条数・鰓紀数・胸鰭棘の形態・核型などに相違が見出された.
    なお, フィリピン・台湾・石垣島産のヒレナマズにっいて分類形質の変異を調べた.石垣島のヒレナマズが移殖魚の自然繁殖したものに由来するか否かは明らかではないが, 台湾産のものと石垣島産のものとは, 分類形質がかならずしも一致しないようである.
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  • 西川 昇平, 尼岡 邦夫, 中西 一恵
    21 巻 (1974 - 1975) 2 号 p. 61-71
    公開日: 2010/06/28
    ジャーナル フリー
    日本産ハゼ亜目魚類12種 (9属, 5亜科, 2科) の染色体を調査し, 体細胞染色体数およびNF数を数えた.染色体数はドンコ, ヨシノボリ, ゴクラクハゼ, マハゼ, ドロメ, ビリンゴ, ウキゴリ, チチブおよびシマノ・ゼでは2n=44で, ムツゴロウ, トビハゼでは2n=46, スジハゼでは2n=50である.NF数は44~98の範囲にある.これらの種類と以前報告されたものを合せた33種と2亜種の染色体数を, 従来の分類体系と比較した結果, 両者の関係は属間ではよく一致しているが, 科および亜科段階では必ずしも一致していなかった.しかし, 一般的な傾向として, カワアナゴ科では44~46, ハゼ科の中ではチチブ亜科で44, トビハゼ亜科で46, タビラクチ亜科で46~48, ハゼ亜科で48~50であり, 比較的安定している.だが, ヨシノボリ亜科では40~46の広範囲にわたっている. このことはこの亜科が多くの種と属を含むため, その豊富な種的分化と関係していると考えられる.他方, ここで調査した12種において, 染色体数とNF数から, 核型はドンコ属とヨシノボリ属が最も単純で, マハゼ属, アゴハゼ属, チチブ属, ウキゴリ属, ムッゴロウ属, トビハゼ属, クツワハゼ属の順に複雑化している.
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  • 明仁親王 , 目黒 勝介
    21 巻 (1974 - 1975) 2 号 p. 72-84
    公開日: 2011/07/04
    ジャーナル フリー
    Ophieleotris aporos was originally described by Bleeker (1854: 59) as Eleotris aporos.After Gill (1863: 270) established the genus Ophiocara based on Eleotris ophicephalusValenciennes, a synonym of Ophiocara porocephala (Valenciennes), E.aporos wasassigned to the genus Ophiocara by Bleeker (1877: 27).Aurich (1938: 132) established a new genus Ophieleotris for O.aporos based on the study of sensory canal pores, arrangement of pit organs and other characteristics. However, his genus has not been used by others but Whitley (1964: 55), as far as it is known to us.
    Our study on comparative morphology on O.porocephala and O.aporos with other species, listed on p.74, has revealed further different characteristics between two species and other species, some of which can be used for separating O.aporos from the genus Ophiocara and for recognizing the genus Ophieleotris for O.aporos.
    The characteristics of the two species are listed in Table 1.The most importantcharacteristics of the two genera, Ophiocara and Ophieleotris, in comparison with othergenera listed on p.74 are: 1) The presence of a process on the inner side of themaxillary in Ophiocara (Fig.1A) and the absence in Ophieleotris (Fig.1B).2) Thepresence of oculoscapular canal from nasal to posttemporal with the pores A to Lexcept for G, of preopercular canal with the pores M to Q and three supratemporalsin Ophiocara (Fig.2A);the absence of oculoscapular canal and supratemporals andthe presence of short preopercular canal with the pores N'and O'in Ophieleotris (Fig.2B). 3) 17 segmented caudal fin rays in Ophiocara and 15 segmented caudal finrays in Ophieleotris.4) 26 (or rarely 27) vertebrae and the first and second pterygiophoresof the first dorsal fin are inserted between the third and fourth vertebrae in Ophiocara (Fig.3A);25 vertebrae and the first pterygiophore between the third and fourthvertebrae (Fig.3B) or the first two or three pterygiophores between the fourth andfifth vertebrae in Ophieleotris (Fig.3C).5) The presence of a short, low longitudinalridge on frontal in Ophieleotris (Fig.4A);the absence of the ridge in Ophiocara (Fig.4B).6) The size of a scale of interorbital space of Ophiocara smaller than thatof caudal peduncle;the size of a scale of interorbital space of Ophieleotris larger thanthat of caudal peduncle and the largest of all the genera;the size of a scale of caudalpeduncle of both genera is not different.Although O. porocephala has no suborbitalwhose presence is thought to be an unspecialized characteristic, it has common characteristicsin 1) to 4) with the species with a suborbital, except for the loss of thepore G.Thus O.porocephala closely resembles the species with a suborbital whichare thought to be the most unspecialized species. As for O.aporos, when compared with them, it has no characteristics which are as unspecialized as those found in O.porocephala.
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  • 木村 清朗
    21 巻 (1974 - 1975) 2 号 p. 85-91
    公開日: 2011/07/04
    ジャーナル フリー
    A spawning redd of the salmonid fish was found in the Nigorimizu-sawa of the Oirase River system (40° 41'N, 139°58'E), which flows into the Japan Sea in Aomori Prefecture (Figs.2, 3).More than 1, 700 eyed eggs were obtained on November 21, 1960, from this redd.These eggs measured 5.3-5.9mm in diameter.They began to hatch on November 24.The alevins and fry are described and illustrated in this paper (Fig. 4).The fry, liberated in a small pond (ca.4 m2, 50-80 cm deep), took mainly small crustacea and aquatic larvae of insects and attained 38 43 mm in total length by the next April.These fry are considered as members of either of the genera Salvelinus or Hucho for their characteristic arrangement of the vomer and palatine in the roof of the mouth (Fig.5).Because the fish of Hucho is a vernal spawner in Japan, the present fry must belong to Salvelinus.
    In the Nigorimizu-sawa, there are two types of char Salvelinus leucomaenis (Pallas), i.e., an anadaomous form and a fluvial dwarf form of the same species.Generally, the former grows up 40 cm or more in total length, however, the latter attains 30 cmat largest and rarely deposits eggs exceeding 300 in number at a single spawning redd.Therefore, the present spawning redd, eggs, alevins, and fry are thought to be of theanadromous char called“Amemasu”in Japanese (Fig.1).The parr marks appear inthe alevins of S.malma (Walbaum) (Blackett, 1968), but not visible in the presentalevins throughout their yolk consuming stage (Fig.4).So, there is no reason toidentify these alevins as S.malma.
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  • 藤井 武人
    21 巻 (1974 - 1975) 2 号 p. 92-100
    公開日: 2011/02/23
    ジャーナル フリー
    コチ科魚類の雌雄性は, 雄性先熟の性転換に伴う生殖巣の形態変化の様式によって, 雌雄同体性から異体性への移行傾向が認められている.ここではMatsubara and Ochiai (1955) による本科魚類の系統, 類縁関係を再検討し, 雌雄同体性の減衰過程が種的分化と対応していることをあきらかにした.
    本科魚類の種的分化の過程では, アネサゴチ亜科類を派生した特殊化の方向と, トカゲゴチ亜科類や, コチ亜科類を生じた発展的方向が認められ, トカゲゴチ亜科のクモゴチ属が分化の中心的位置にあると考えられる.雌雄同体的性格は, 生活型に祖先のなごりを多く残していると思われるクモゴチ属において最も強く, それから縁遠い種ほど弱くなっている.このことから, さかのぼってコチ科魚類の遊泳型の祖先は, 強い雌雄同体的性質を有するところの同時成熟型の雌雄同体であったと推定される.
    雌雄同体種が多数知られているスズキ科やタイ科のような分類群とコチ科にみられる、典型的な両性生殖巣の形態は, 同時成熟型のものであり, その本質的な相違は構造的に卵巣部分と精巣部分の独立性が強くなっている点にある.これはかつて雌雄同体性がこれらの祖先の雌雄性において優勢であった時代に, 同時成熟雌雄同体性の生殖機能の前進があったことを意味するものであろう.
    これら3科にみられる雌雄同体性の減衰過程は, 雌雄異体から同体への移行の後に生じた二次的な過程ではなく, 雌雄同体性が魚類の本来の雌雄性であり, 少なくとも3科の魚類の雌雄性は雌雄同体性の共通根を有するものと考えられる.
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  • 岸本 浩和
    21 巻 (1974 - 1975) 2 号 p. 101-107
    公開日: 2011/02/23
    ジャーナル フリー
    In May 11th, 1973, 399 specimens of Stethojulis were collected in Suruga Bay, ofwhich 33 showed color phase of S.interrupta and 366 that of S.kalosoma.In anaquarium, 312 specimens with“kalosoma”pattern were kept at the water temperature18.3-25.1°C.Some of them changed their color pattern to“interrupta”phase, within10 days.Among 312 specimens, 54 (42 died, 12 alive) changed to S.interrupta phaseand 258 remained in“kalosoma”phase (187 died, 71 alive), by July 31, 1973.Duringthe color change, certain specimens took on color patterns resembling S.“trossula”.It was found that individuals of“kalosoma”phase included female, male and indeterminables, whereas those of“interrupta”phase were all males.On the basis ofmorphological characters and color patterns, it was concluded that S.kalosoma andS.trossula are junior synonyms of S.interrupta, and represent different color phasein the course of the sex reversal from female to male.
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  • 丸山 潔, 大野 賢二
    21 巻 (1974 - 1975) 2 号 p. 108-109
    公開日: 2010/06/28
    ジャーナル フリー
    Fishes of the family Melanostomiatidae previously recorded from Japan include seven species in live genera.In 1972, the junior author found a specimen of Melanostomias albibarba Regan and Trewavas in the northern Pacific (38°58.0'-39°7.5'N, 142°12.8'-142°15.5'E).This specimen here reported represents the first record of the species from Japan.A new Japanese name “Shirohige-hoshieso”is proposed.
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