著者
小山 直人 北川 忠生
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.56, no.2, pp.153-157, 2009 (Released:2014-03-05)

In order to examine genetic introgression from the orange-red type commercial strain of Oryzias latipes (himedaka) to wild medaka populations, a polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) analysis of the mitochondrial cytochrome b gene was conducted for 45 populations from the Yamato River system, Nara Prefecture and two fish farm populations from special product grounds of himedaka (Yamatokoriyama and Yatomi Cities). Orange-red type fish only were collected from three sites, and a mixture of wild and orange-red types from sympatric populations at four other sites in theYamato R. system. Most orange-red type specimens had the B27 mitotype, being identical with that of the typical orange-red type Hd-rR strain. Although most of the wild type fish individuals had mitotype B1a, inferred as one of the native mitotypes in the Yamato R., four from three sites had mitotype B27, implying genetic introgression from himedaka to wild medaka populations.
著者
馬渕 浩司 瀬能 宏 武島 弘彦 中井 克樹 西田 睦
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.57, no.1, pp.1-12, 2010 (Released:2014-03-05)
参考文献数
22

A recent mitochondrial (mt) DNA survey revealed that the native Japanese population of the common carp has been endangered by the introduction of non-native domesticated strains: more than half of the haplotypes detected so far in Japanese waters originated from Eurasian strains. In expectation that Lake Biwa, the largest freshwater body in Japan, contains a relatively pure native population, we conducted a survey of mtDNA haplotypes in the lake, collecting 856 common carp from 40 localities in the lake. Of these, 606 specimens were caught by various nets (gill net, set net, net trap, etc.) used at depths from 1 to 5 m, 148 specimens were caught by a trawl net used at depths from 30-70 m, and 102 specimens that had washed ashore during mass mortality caused by Koi herpes virus (KHV) in 2004 were collected by hand. For each of the specimens, the mitochondria- encoded cytochrome b gene was genotyped (Japanese native or non-native haplotypes) by PCR using allele-specific primers. Analysis of haplotype frequencies showed that the native Japanese haplotype was significantly more frequent in deep off-shore waters and waters along the steep northern coast of the North Basin (about 80% on average), than in shallow coastal waters in the South Basin and waters along the eastern coast of the North Basin (less than 50% on average). These results indicate that the deep waters of the lake may contain a relatively pure native population that is of prime importance for conserving the native Japanese common carp. Among the results, it is notable that more than 90% of the KHV-killed specimens had native Japanese haplotypes.
著者
Gento Shinohara Kunio Amaoka
出版者
The Ichthyological Society of Japan
雑誌
Japanese Journal of Ichthyology (ISSN:00215090)
巻号頁・発行日
vol.40, no.4, pp.487-490, 1994-02-15 (Released:2010-06-28)

北海道室蘭沖から得られ, 完模式標本以外に採集例のないヤセアイナメStellistius katsukii Jordan et Tanaka, 1927と同海域で普通に採集されるホッケPleurogrammus azonus Jordan et Metz, 1913との関係について主に外部形態に基づき調査した.両種の完模式標本と日本各地から得た23個体のホッケの標本を比較したところ, 両者に差異は認められなかった.従って, ヤセアイナメはホッケのシノニムであり, ヤセアイナメ1種のみを含むヤセアイナメ属Stellistiusもホッケ属Pleurogmmmusのシノニムである.また, 背鰭第1鰭条が長く, 後続のものとほとんど同じであるというヤセアイナメ属の特徴は模式標本の再調査では認あられず, Jordan and Tanaka (1927) の観察が誤りであったと判断された.
著者
Tadashi Inada J.A.F. Garrick
出版者
The Ichthyological Society of Japan
雑誌
Japanese Journal of Ichthyology (ISSN:00215090)
巻号頁・発行日
vol.25, no.4, pp.235-243, 1979-02-15 (Released:2010-06-28)

Rhinochimaera pacifica previously known only from Japan and Peru is reported and described from 23 New Zealand specimens taken on the Chatham Rise, Challenger Plateau and east of Stewart Island in depths of 750-1110 m. Comparison with R.atlantica, the other nominal species, shows that R.pacifica differs only in its higher number of denticulations on the upper caudal margin of males (34-69 in New Zealand and Japanese specimens, 25-30 in R.atlantica).
著者
Yuichi Kanemori Takeshi Takegaki Yutaka Natsukari
出版者
The Ichthyological Society of Japan
雑誌
Japanese Journal of Ichthyology (ISSN:00215090)
巻号頁・発行日
vol.53, no.2, pp.133-141, 2006-11-25 (Released:2010-06-28)

The genetic population structure of the mudskipper Boleophthalmus pectinirostris was investigated based on nucleotide sequence data from the mitochondrial control region (472 bp) of 131 individuals collected from four localities in Ariake Bay, two in Yatsushiro Bay, Kyushu, Japan, one in Korea (Suncheon) and one in China (Zhe Jiang). A total of 53 composite haplotypes were observed from 49 permutation sites. The estimated haplotype tree and pairwise Fst showed genetic differentiation among the Suncheon, Zhe Jiang and Japanese populations. The structures of the haplotype tree and network, and low genetic diversity of the Japanese populations compared to that at Zhe Jiang suggested that a bottleneck effect had occurred in the former after being isolated from the continental population by rising sea levels (i. e., relictual species). Based on the number of unique haplotypes in the Japanese populations and nucleotide substitution rate, the estimate of the divergence time for the Japanese and Zhe Jiang populations was much greater than that expected for the apparently relictual species distributed in Ariake Bay. The Ariake and Yatsushiro populations formed a single group in the haplotype tree, although the estimate of pairwise Fst showed a significant difference between the populations, probably associated with the differences in frequency of the most dominant haplotype. Accordingly, the two populations seemed to be genetically differentiated from each other, probably due to the geographical isolation.
著者
Akira Goto
出版者
The Ichthyological Society of Japan
雑誌
Japanese Journal of Ichthyology (ISSN:00215090)
巻号頁・発行日
vol.32, no.3, pp.359-362, 1985-11-28 (Released:2010-06-28)

淡水カジカ類の一種カンキョウカジカの第1背鰭棘と第2背鰭軟条にそれぞれコード番号を符した後, それらを組み合わせて除去することによって個体識別する方法を考案し, またそれを自然河川個体群に適用することによって有効性を検討した.その結果, 本マーキング法は体長50mm以上の個体に容易に用いることが出来, 魚の運動能力にほとんど影響を与えることがなく, 組み合わせによっては数千個体の識別が可能であり, かつ, 永久マークとなるので極めて有効なマーキングの方法であると判断された.
著者
Hiroshi TSUKAHARA
出版者
The Ichthyological Society of Japan
雑誌
Japanese Journal of Ichthyology (ISSN:00215090)
巻号頁・発行日
vol.3, no.3-5, pp.139-143, 1954-06-30 (Released:2011-02-23)
被引用文献数
1 or 0

In this paper the writer deals with the breeding habits of the fresh-water suker, Abbottina rivularis (BASILEWSKy), a small cyprinoid fish. The usual habitats of the fish are the slow streams with muddy bottom. The spawning season lasts from beginning of March to early May. In the breeding male numerous horny tubercles appear on the snout, anterior part of the cheek, pre-opercle region and on the outer margin of pectoral fins. Dusky and yellow nuptial coloration also appears on the body.The male fish prepairs a nest on the muddy bottom in the shape of a round, shallow depression, 20-40 cm. in diameter and 3-5 cm. in depth. In this nest about 2, 000-4, 000 eggs are deposited, over which the male parent fish eagerly keeps guard until the hatched larvae attain the end of the post-larval stage, about 10mm. in total length. The egg is spherical in shape and about 1.4mm. in diameter, with a jelly-like coating of about 1mm. in thickness. The surface of the jelly coat is covered with mud.
著者
Jinsuke Akada Taiga Yodo
出版者
The Ichthyological Society of Japan
雑誌
Japanese Journal of Ichthyology (ISSN:00215090)
巻号頁・発行日
vol.53, no.2, pp.175-179, 2006-11-25 (Released:2010-06-28)

Between-habitat variations in the body shape of Hemigrammocypris rasborella, a small freshwater cyprinid fish included in the Red List by the Ministry of Environment of Japan (Category EN), were analyzed using photographs of anesthetized specimens (n=323) collected from eight ponds on the Ise (Mie Prefecture) and Nobi Plains (Aichi and Gifu prefectures). Twenty-two morphometric variables were measured, and principal component and discriminant analyses conducted. The results indicated that body shape was variable among the ponds but similar within each plain. It is suggested that the original Ise and Nobi Plain populations differed in body shape, the subsequent restriction to isolated populations on each plain further enhancing the original morphological variations.
著者
Yuji Yamazaki Akira Goto
出版者
The Ichthyological Society of Japan
雑誌
Japanese Journal of Ichthyology (ISSN:00215090)
巻号頁・発行日
vol.47, no.1, pp.1-28, 2000-05-25 (Released:2010-06-28)

Because lampreys have been considered to be representative of primitive vertebrates, frequent taxonomic, phylogenetic and speciation studies have been made, both before and since the landmark publication, “The Biology of Lampreys” (-1971-81). Primarily because of their low diversity of morphological features (treated as valid taxonomic characteristics), lampreys have been subject to much taxonomic uncertainty. Nevertheless, current phylogenetic hypotheses, based pri-marily on dentition, have been accepted by many researchers, with only slight modifications, over the last 2-3 decades. However, recent molecular studies of some lamprey groups have demonstrated the potential for a molecular approach to phylogenetic systematics of lampreys and a new basis for evaluation of previously-held hypotheses.Many lamprey genera are composed of several species characterized by different life-styles, such as parasitic, anadromous and nonparasitic, fluvial. The speciation process proposed in previous studies has been broadly divided into the following patterns: nonparasitic, fluvial species have evolved directly from a parasitic, anadromous species; and some nonparasitic, fluvial species have evolved from an intermediate at the parasitic, fluvial stage, rather than directly from a parasitic, anadromous form. In this review, these two processes and the mechanisms by which nonparasitic forms may have evolved, are discussed.As a case study, phylogeny and speciation within the Far East monophyletic genus Lethenteron is considered. Four Lethenteron taxa, L. japonicum, L. kessleri and the northern and southern forms of L. reissneri, should be regarded as discrete species because of the existence of reproductive isolation between all possible pairs of taxa in region of sympatry. In the monophyletic group, comprising the former three species, the nonparasitic fluvial L. kessleri and the northern form of L. reissneri are both thought to have evolved from ancestral stocks of parasitic, anadromous L. japonicum, following the occurrence of precocious dwarf individuals in each an-cestral line.
著者
Akihito Katsuichi Sakamoto
出版者
The Ichthyological Society of Japan
雑誌
Japanese Journal of Ichthyology (ISSN:00215090)
巻号頁・発行日
vol.36, no.1, pp.100-112, 1989-06-28 (Released:2011-02-23)
被引用文献数
0 or 3

The striped goby was characterized by having more than 50 scales in a longitudinal row and 2 black longitudinal bands from the head to the tail. It has been regarded as 1 species since Tomiyarna (1936) grouped several nominal species into one, Tridentiger trigonocephalus (Gill, 1858). But detailed study has revealed that it can be classified into 2 separate species, T. trigonocephalus and Tridentiger bifasciatus Steindachner, 1881, on the basis of the difference mainly in the forms of the sensory canals and pectoral fins and in the coloration. T. trigonocephalus has been collected from Hokkaido to Kyushu in Japan, and in Korea, China, and Hong Kong abroad. It has immigrated into both California, U.S.A., and New South Wales and Victoria, Australia. T. bifasciatus has been collected in the same area as T. trigonocephalus in Japan, and in the Soviet Union, Korea, China, and Taiwan abroad. Both species inhabit brackish and sea water with stony bottoms, and are often found in the same place. However, T. trigonocephalus has seldom been found in very dilute brackish water, and T. bifasciatus has not been found in undiluted sea water. The type specimen of T. trigonocephalus has not been found, but the identification to T. trigonocephalus was decided on the basis of the closeness of the numbers of the 2nd dorsal and anal fin rays to those of the original description, which were 14 and 13, respectively. In addition, the type specimen was collected in the port of Hong Kong, where the water is not diluted and is unlikely to be suitable as habitat for T. bifasciatus.
著者
水澤 信之 福井 篤
出版者
The Ichthyological Society of Japan
雑誌
魚類学雑誌 (ISSN:00215090)
巻号頁・発行日
vol.56, no.2, pp.149-152, 2009

An opisthoproctid fish, Dolichopteryx parini, was reported for the first time from Japanese waters, on the basis of a single specimen collected off the Pacific coast of Aomori Prefecture. The species has previously been recorded from the northern part of the Sea of Okhotsk, and other northern and eastern regions in the North Pacific Ocean. The Aomori specimen represents the southernmost record of the species.
著者
Makoto Sakurai Jun Hirose Akihiko Shinomiya
出版者
The Ichthyological Society of Japan
雑誌
Japanese Journal of Ichthyology (ISSN:00215090)
巻号頁・発行日
vol.50, no.2, pp.165-168, 2003-11-25 (Released:2011-07-04)

Abstract We conducted underwater observations on courtship and spawning be-haviors of the tetrarogidid fish, Hypodytes rubripinnis in Kyushu Island, Japan. The reproductive behavior and seasonal changes of gonad somatic index on col-lected specimens showed that spawning occurred from late April to early August. Individuals of various sizes in both sexes reproduced in the study area. About 90 min before sunset, a male courted a female actively with several patterns of be-haviors such as male's lying by a female in a side-by-side position, display of his lateral side around a female, and male's riding on a female back. Finally, the pair swam toward 20 to 100 cm above the bottom to release gametes. Spawning time was around sunset. The average egg number in each spawning was about 1600. Upward rush of the pair to the middle water occurred very quickly. Frequent sneaking behavior by another male was also observed.
著者
Kazuhiro Nakaya Hideki Nakano
出版者
The Ichthyological Society of Japan
雑誌
Japanese Journal of Ichthyology (ISSN:00215090)
巻号頁・発行日
vol.42, no.3-4, pp.325-328, 1995-11-25 (Released:2010-06-28)

南大西洋で漁獲されたツノザメ目ツノザメ科のオジロザメScymnodalatias albicauda の1尾の妊娠個体から発生中の59個体の胎仔を見いだした.胎仔の性別はオス33個体, メス26個体で, オス: メスの性比は1: 0.79, 大きさは全長157mmから192mmであった.本個体はマグロ延縄で漁獲されたが, 捕獲時の記録によると, いくつかの胎仔が総排出腔より海中に落ちたという.したがって, 60個体以上の胎仔をもっていたと推測される.サメ類の1腹の胎仔数は種類や個体の大きさにより様々であるが, ツノザメ類で知られている1腹の胎仔数は36個体までで, 大部分は20個体以下である.本研究ではオジロザメから1腹59個体の胎仔を見いだしたが, これは今までのツノザメ類の記録をはるかに上回る数で, ツノザメ類では最多, サメ類全体からみてもヨシキリザメ (135個体), カグラザメ (108個体) に次ぐ3番目の胎仔数である.なお, 各胎仔は大きな外卵黄嚢をもち, 腹腔内の3分の2の長さにおよぶ内卵黄嚢が形成されていた.内卵黄嚢は腸の始部 (十二指腸部) に直接開口し, 腸内にも卵黄物質が見られた.生殖方法は卵胎生 (卵黄物質にのみ依存する非胎盤性の胎生) であると考えられる.
著者
Yukio Iwatsuki Masato Akazaki Tetsuo Yoshino
出版者
The Ichthyological Society of Japan
雑誌
Japanese Journal of Ichthyology (ISSN:00215090)
巻号頁・発行日
vol.40, no.1, pp.47-59, 1993-05-15 (Released:2010-06-28)
被引用文献数
1 or 0

体側に眼状斑を持っヨコスジフエダイと眼状斑を持たないタテフエダイは日本では区別されてきたが, 両者は最近同種としてタテフエダイ, Lutjanus vitta (Quoyet Gaimard) とされた.タテフエダイの特徴は稚魚期に眼状斑を持ち, その眼状斑は成長とともに消えるとされるが, 日本でみられるヨコスジフエダイは生涯この眼状斑を持っており, タテフエダイの記載は不十分である考えられた.そこで両者の再検討を行った.ヨコスジフエダイは体側縦線上に眼状斑を生涯持ち, 前鰓蓋骨後部下縁に小鱗を持たない, 側線鱗数は46上49であり, 背鰭及び臀鰭軟条の伸び率が大きい (背鰭第1軟条1.2-2.0;臀鰭第1軟条1.5-2.2) が, タテフエダイは体側縦線上に生涯眼状斑を持たず, 前鰓蓋骨後下縁に小鱗を持ち, 側線鱗数は49つ2であり, 背鰭及び臀鰭軟条の伸び率が小さい (背鰭第1軟条0.9-1.4;臀鰭第1軟条1.1-1.7) ことで両者は明かに区別出来た.更に両者の分布域は, 台湾西南部及び香港周辺においては重なっているものの, ヨコスジフエダイは南日本から (琉球列島を除く) 山陰地方, 韓国南部, 黄海, 台湾西部及び香港周辺の東アジア大陸棚上の限定した海域にのみ分布するのに対し, タテフエダイはヨコスジフエダイの分布域以外のインド-西太平洋 (日本の琉球列島を含む) の熱帯域から亜熱帯域に広く分布していた.これらの点から, 両者は別種として判断された.尚, ヨコスジフエダイの学名は日本の長崎を模式産地とするL. ophuysenii (Bleeker) が有効であり, タテフエダイの学名はスマトラを模式産地とするL.vitta (Quoy et Gai-mard) が正しい.
著者
松沼 瑞樹 本村 浩之
出版者
日本魚學振興會
雑誌
魚類学雑誌 (ISSN:00215090)
巻号頁・発行日
vol.56, no.1, pp.21-30, 2009-04-27

日本に分布するカダヤシ科グッピー属魚類には、日本各地の温泉地と琉球列島に生息するグッピー、および北海道室蘭市白老町に生息するコクチモーリーの2種が知られている。これら日本国内に生息するグッピー属魚類はいずれも人為的に導入されたものであり、本属魚類の原産地はいずれも中央アメリカである。鹿児島県の薩摩半島南部に位置する指宿市では、二反田川の南側に広がる市街を中心に多数の温泉保養施設があり、住宅地では一般家庭に温泉水が供給されている。それらの施設や住宅から排出された温泉水は、用水路を介して二反田川に流出している。鹿児島県レッドデータブックにおいて、米沢は指宿市の二反田川にコクチモーリーが生息することを目録的に報告した。しかし、本研究で指宿市のグッピー属魚類と北海道白老町産のコクチモーリーを詳細に比較したところ両者は別種であることが明らかになり、前者はPoecilia mexicana Steindachner、 1863に同定された。指宿市のP. mexicanaは二反田川の全流域にわたって、稚魚から成魚まで周年確認されており、本種は同河川で自然繁殖している。本報告では指宿市二反田川産P. mexicanaを記載するとともに、本種の成長に伴う形態の変化および性的二型を報告する。さらに本種には標準和名が与えられていないため新標準和名を提唱する。
著者
Hiroshi Kohno
出版者
The Ichthyological Society of Japan
雑誌
Japanese Journal of Ichthyology (ISSN:00215090)
巻号頁・発行日
vol.31, no.3, pp.268-286, 1984-11-20 (Released:2010-06-28)

ウロコマグロの骨格系を記載した. それに基づいて, スズキ目に属する9科との比較を行い, ウロコマグロの系統的位置を考察した.ウロコマグロはサバ科魚類の特徴とみなされた13形質のうち12形質を保有していた.これに対して, サバ科以外のスズキ目魚類では, ウロコマグロとだけ共有されている形質はシイラ科の節骨以外に見出すことはできなかった.さらに, ウロコマグロには15の特異な形質が認められた.これらの形質は主に頭部に集中しており, これらの形質に基づいて単一の科を提唱することは本質的ではないと判断した. 以上のことから, ウロコマグロはサバ科に属すると結論した.ウロコマグロと他のサバ科魚類を比較すると, ウロゴマグロにはサバ科の原始的・派生的形質がモザイク状に分布していることが判明した. 先に述べた15の特異形質とサバ科魚類の形質状態がモザイク状に分布していることから, ウロコマグロは早い時期にサバ科の主幹から分化して独自の特化方向へむかったものと推論した.
著者
Mutsumi Nishida
出版者
The Ichthyological Society of Japan
雑誌
Japanese Journal of Ichthyology (ISSN:00215090)
巻号頁・発行日
vol.35, no.3, pp.236-242, 1988-12-15 (Released:2010-06-28)
被引用文献数
1 or 44

日本・琉球列島産アユの地理的変異の分析の結果, 琉球列島に生息するアユは他と明瞭に異なる独自の集団であることが分かったので, 奄美大島および沖縄島から得られた標本に基づき, これを新亜種Plecoglossus altivelis ryukyuensis (和名: リュウキュウアユ) として記載した.本亜種は, 縦列鱗数, 側線上・下方横列鱗数および胸鰭条数が少ないことにより, 基亜種と区別される.また, 本亜種は, いくつかの酵素分子が, 電気泳動的に他とは明瞭に異なることによっても特徴づけられる.
著者
Fumio Kato
出版者
The Ichthyological Society of Japan
雑誌
Japanese Journal of Ichthyology (ISSN:00215090)
巻号頁・発行日
vol.25, no.3, pp.197-204, 1978-12-15 (Released:2011-02-23)
被引用文献数
3 or 0

Morphological and ecological studies on two forms of Oncorhynchus rhodurus Jordan et McGregor living in Lake Biwa and adjoining inlets were conducted. The fluviatile form (the amago) and the lacustrine form (the biwamasu) showed morphological differences in number of pyloric caeca, transverse scales, ventral fin rays and red spots on lateral body. The fluviatile form lives in the upper waters of inlets to Lake Biwa, but the lacustrine form leaves the streams as fry and lives in Lake Biwa almost all its life. In addition to this, there are ecological differences in maturity age, growth rate and food habits between the two forms. It is presumed that the fluviatile form and the lacustrine form living in this lake and adjoining inlets consist of different populations.