著者
竹花 佑介 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.57, no.1, pp.76-79, 2010 (Released:2014-03-05)
参考文献数
18
被引用文献数
1 or 0
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)
参考文献数
12
被引用文献数
1 or 0

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
篠原 現人 尼岡 邦夫
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.4, pp.487-490, 1994-02-15 (Released:2010-06-28)
参考文献数
11

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
稲田 伊史 J.A.F. Garrick
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.25, no.4, pp.235-243, 1979-02-15 (Released:2010-06-28)
参考文献数
23

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
兼森 雄一 竹垣 毅 夏苅 豊
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.53, no.2, pp.133-141, 2006-11-25 (Released:2010-06-28)
参考文献数
45

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
後藤 晃
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.359-362, 1985-11-28 (Released:2010-06-28)
参考文献数
7

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
塚原 博
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.3, no.3-5, pp.139-143, 1954-06-30 (Released:2011-02-23)
参考文献数
5
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
仲谷 一宏
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.1, pp.35-42, 1993-05-15 (Released:2010-06-28)
参考文献数
9

1992年3月8日午後, 愛媛県松山市堀江沖2.3km, 水深22メートルの海底でヘルメット式潜水器具を用いてタイラギ貝漁をしていた潜水夫が行方不明になった.この潜水漁を支援していた船の船長によると, 作業中の潜水夫から突然「上げてくれ」という救助を求める声を聞き, 20分程度かけてやっと引き上げたが, ズタズタに裂けた潜水服とヘルメットだけを回収したという.潜水夫は行方不明で, その後の捜索にもかかわらず, 結局発見できなかった.この事故直後に海上保安部などにより潜水服の調査が行われ, その結果サメによる事故とされた.しかし, その後は詳しい調査が行われず, サメ以外の説も出されるようになったため, 佐賀県太良町の潜水士宅に保管されていた潜水服の再調査を実施した.その結果, 潜水服は胸部から脇腹にかけての胴部右半分と右足が切断され, 肩や腕などに多くの咬み傷のあることが改めて確認された.ヘルメットを固定する金属性の肩当て部分には強い力で穿孔されたと思われる穴や細かな平行な曲線からなる傷跡があり, 通信用ケーブルやゴム部の切断面にも細かな平行のすじ状の模様があった.肩当て部分のゴムの深い傷から長さ約5mm, 幅約2.5mmの歯の破片が発見され, これには2個の鋸歯が残されていた.また, 肩当てや潜水服に残された咬み跡を調査して顎の幅を検討したところ, 40cmはあったと推定された.これらの証拠から, この潜水夫を襲ったのは歯の縁辺部に鋸歯をもっかなり大形のサメであったことが明白となった.これらの歯の破片の特徴, 潜水服などに残された傷跡, 顎の大きさなどに加え, 水温 (当時の付近の水温は水深20mで1L6℃) や四国近海での当時のサメ類の出現状況などを総合的に検討した結果, この潜水夫を襲ったのは全長5m前後のホホジロザメであると結論された.日本では以前からサメによる被害が新聞などで時々報道されているが, これらの記録は散逸し, 被害の実態を捕らえることが出来ない.従って, 日本のサメによる被害を調査したが, 公認されているものも含め現時点で10数件の被害例を見い出した.しかし, これらの日本の事例においては, 襲ったサメの種類調査など後の科学的調査がほとんどなされていないため, 日本で被害を与えているサメについては種名すら分かっていないのが現状である.将来のサメによる事故を防ぐ意味からも, まだ埋もれているサメ被害例を発見し, 分析してみる必要があろう.なお, 本研究で集められたサメによる被害にっいては国際サメ被害目録 (International Shark Attack File, 事務局はフロリダ自然史博物館) に載せておいた.
著者
水口 憲哉 檜山 義夫
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.16, no.1, pp.17-23, 1969-06-15 (Released:2010-06-28)
参考文献数
11

東京都下秋川において行なった調査により, オイカワZacco platypusの成熟および臀鰭の性徴について以下の点を明らかにした.1) 6月から8月の産卵期に, 雄はよく発達した追い星, 体側の赤および青緑色, そして異常に発達した臀鰭などによって特徴づけられた.III+才魚およびII+才雄の半数よりなるこれらの成熟雄は産卵活動を行ない9月までに死に絶えてしまった.2) II+才雄の残り半数は, 何ら二次性徴を示さず, 細い糸状の精巣をもったままで産卵期を経過してしまったため, 上述の成熟雄に対し“非成熟”雄とされた.“非成熟”雄は, 夏期にも成長を続け翌年の産卵期にIII+才魚として成熟した.3) 成熟雌においてもその程度は低いが臀鰭における形態的変化がおこった.雌はほとんどがII+才で産卵を開始しIII+才で2回目の産卵を行なった後に姿を消した.4) 5月から8月にかけては, 全長80mm以上のオイヵワについて臀鰭長により雌雄の判定が可能であり, また, 特に雄においては性的成熟の度合を知ることができる.5) 鱗に表われた過去の成長状態を参考にして, 雄が成熟または“非成熟”へと別れる過程およびII+才雄全体に対する“非成熟”雄の割合などについて考察した.
著者
櫻井 真 広瀬 純 四宮 明彦
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.50, no.2, pp.165-168, 2003-11-25 (Released:2011-07-04)
参考文献数
8

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
仲谷 一宏 中野 秀樹
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.42, no.3-4, pp.325-328, 1995-11-25 (Released:2010-06-28)
参考文献数
9

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
赤田 仁典 淀 太我
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.53, no.2, pp.175-179, 2006-11-25 (Released:2010-06-28)
参考文献数
8

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
Martha J. Zaiser Ronald Fricke
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.31, no.4, pp.389-397, 1985-02-20 (Released:2010-06-28)
参考文献数
6

三宅島から採集された24個体の標本に基づいて1新種ミヤケテグリSynchiropus moyeriを記載した.本種は三宅島で普通にみられ, 広域に分布するコウワンテグリs.ocellatusに形態的に著しく類似している.ミヤケテグリは背鰭や体側の色斑が特殊であるうえ, 強い配偶選択性を示し, 近似種と完全な生殖的隔離をしている.本種は単独生活をし, 雌は狭い行動圏を持ち, 5~10月の問に夕暮れ時に産卵する.
著者
山崎 裕治 後藤 晃
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.47, no.1, pp.1-28, 2000-05-25 (Released:2010-06-28)
参考文献数
181

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
向井 貴彦 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.50, no.1, pp.71-76, 2003-05-23 (Released:2010-06-28)
参考文献数
24

Phylogenetic relationships among 4 major geographic population groups (San-in-Biwa-Ise, East Seto, West Seto and West Kyushu) of Japanese freshwater goby Odontobutis obscura (Perciformes: Gobioidei: Odontobutidae) and related species O. hikimius were inferred from partial nucleotide sequences of the mitochondrial 12S and 16S rRNA genes. The resultant mitochondrial DNA (mtDNA) phylogeny was consistent with that based on the previous allozyme analysis. This phylogeny showed that specimens from the Sagami River system in Kanagawa Prefecture, Kanto District, were extremely close to fish from the West Seto group, suggesting the formers to have been descended from individuals artifi-cially introduced from the range of the latters. Judging from the fact that about 40 individuals of the goby were easily collected by a person in 2 hrs, the Kanto popu-lation did not seem to be small, and thus might be disturbing the native fauna in the river system.
著者
鈴木 寿之 瀬能 宏
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.41, no.3, pp.281-286, 1994-11-21 (Released:2010-06-28)
参考文献数
7

沖縄県西表島で採集されたハゼ科サッキハゼ属の1新種を記載した.本種は体側鱗が覆瓦状に配列すること, 前眼肩甲管に5孔, 前鯛蓋管に2孔あること, 下顎縫合列の孔器数が1であること, 体側下半部に明瞭な暗色縦帯があるが尾鰭基底に達しないこと, 尾鰭に基底に接しない暗色班があることなどの特徴により既知の15種から区別される.本種はパプアニューギニアとイリアンジャヤにも分布する.
著者
明仁 坂本 勝一
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.36, no.1, pp.100-112, 1989-06-28 (Released:2011-02-23)
参考文献数
16
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.