554 552 1 0 OA ウバザメの幼魚

著者
伊澤 邦彦 柴田 輝和
出版者
The Ichthyological Society of Japan
雑誌
魚類学雑誌 (ISSN:00215090)
巻号頁・発行日
vol.40, no.2, pp.237-245, 1993-08-15 (Released:2010-06-28)
参考文献数
21

三重県和具のサワラ刺網で1977年5月4日, 特異な形状の吻を持っ全長2.6mの雌のウバザメ1頭が捕獲された.脊椎骨椎体に形成された石灰化輪紋の数から生後6ヵ月以内の, その年の1月頃に生まれた幼魚と推定され, 腹面に溝を備えた長く湾曲した吻はウバザメの幼魚形態と考えられた。この吻の幼魚形態は急速に変化して生後1年 (全長4m) でほぼ消失すると推定された.吻は神経頭蓋の3本の吻軟骨によって支持されており, 生後1年以内に起こる吻の急激な形態変化は吻軟骨の相対成長によって引き起こされると考えられた.吻の幼魚形態は胎児期から誕生後の幼魚期にかけての摂食に関わり, 母胎内では卵食性に関係して, 誕生後の若い幼魚にとっては不十分であろうと考えられる遊泳摂餌能力を補償する口域の拡大あるいは流体力学的な意味で摂食に関与するものと考えられる.
著者
明仁 藍澤 正宏 池田 祐二 岸田 宗範 林 公義 中山 耕至 中坊 徹次
出版者
日本魚類学会
雑誌
魚類学雑誌 (ISSN:00215090)
巻号頁・発行日
pp.18-044, (Released:2019-04-05)
参考文献数
32

Hybrids of Rhinogobius biwaensis and Rhinogobius sp. BF were identified in the ponds of Sento Imperial Palace, Kyoto City, Japan, from microsatellite and mitochondrial DNA markers. Mitochondrial DNA analysis indicated that five of seven Rhinogobius specimens had R. biwaensis haplotypes, the remaining specimens having those of Rhinogobius sp. BF. In DAPC and STRUCTURE analyses based on microsatellite data, all specimens examined showed intermediate status between R. biwaensis and Rhinogobius sp. BF, the two species being considered to have formed a hybrid swarm in the ponds because genetically pure individuals of either were not found. This is the first report of recent hybridization under field conditions in Rhinogobius fishes from Japan, confirmed by nuclear and mitochondrial DNA data. Hybrid Rhinogobius specimens from the ponds had 5–17 predorsal scales, an intermediate range between those of non-hybrid R. biwaensis (0–6) and Rhinogobius sp. BF (11–20). However, in appearance they were more similar to R. biwaensis than Rhinogobius sp. BF, having bluish-white distal coloring anteriorly on the first and second dorsal fins, a reduced reddish longitudinal band on the anal fin, and lacking yellowish dorsal and posterior margins on the caudal fin. However, they differed from R. biwaensis in having a narrower white posterior caudal fin margin. Further morphological differentiation of the hybrid specimens was not apparent.
著者
手良村 知功 小枝 圭太 鈴木 尚光 平瀬 祥太朗 瀬能 宏
出版者
一般社団法人 日本魚類学会
雑誌
魚類学雑誌 (ISSN:00215090)
巻号頁・発行日
pp.19-032, (Released:2020-02-28)
参考文献数
18

A single specimen (124 mm in standard length) of the genus Bathophilus, trawled from 300 m in Suruga Bay, Japan on 30 January 2019, was identified as Bathophilus longipinnis (Pappenheim, 1914), being characterized by the following combination of characters: bases of pelvic fins equidistant between dorsal and ventral profiles; pectoral-fin rays 8; pelvic-fin rays 10; ventral row of photophores from tip of isthmus to anal-fin origin 32; large lateral series photophores 25; vertebrae 45 (previously recorded range 40–44); head length 17.3% in standard length (18.0–25.0%); body depth at origin of dorsal fin base 14.3% in standard length. The circumglobal (Atlantic Ocean; Indian Ocean; southern Pacific Ocean: Australia; Central Pacific: Hawaiian Islands; western Pacific Ocean: South China Sea) species has been previously recorded from the Kuroshio Current basin (20– 38˚S, 138–152˚E), although the detailed collection locality was not stated. There being no other records from Japanese waters, the specimen from Suruga Bay represents the first unequivocal record of B. longipinnis from Japan. The new standard Japanese name “Amanogawa-gingaeso” is proposed for the species.
著者
明仁親王 目黒 勝介
出版者
The Ichthyological Society of Japan
雑誌
魚類学雑誌 (ISSN:00215090)
巻号頁・発行日
vol.22, no.3, pp.127-142, 1975-12-29 (Released:2010-06-28)
参考文献数
28

フタゴハゼGlossogobius giuris (Hamilton) と見なされていたウロハゼ属の1型は新種と認められたのでG.aureus (新称: コンジキハゼ) として記載した.本種の最も重要な特徴は孔器の配列にある.ウロハゼ属の他の種と比較し, その特徴を明らかにした.
著者
竹花 佑介 北川 忠生
出版者
一般社団法人 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
7
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

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
中島 淳 橋口 康之 杉尾 哲 東 貴志 越迫 由香里 田口 智也
出版者
日本魚類学会
雑誌
魚類学雑誌 (ISSN:00215090)
巻号頁・発行日
pp.18-024, (Released:2019-02-06)
参考文献数
42

Two voucher specimens of the spined loach, Cobitis matsubarae Okada and Ikeda, 1939, collected from the Shonai River, a branch river of the Oyodo River system, southern Kyushu, Japan, represent the first reliable record of that species from the Oyodo River system. Morphological features of the male lamina circularis, prepelvic myotome number, maxillary barbel length, snout length, body pigmentation patterns, and genetic characteristics of mtDNA cytb sequences were in close agreement with characters those of C. matsubarae. Together with C. sakahoko, C. matsubarae, is considered to be distributed naturally in the Oyodo River system.
著者
小泉 雄大 田城 文人
出版者
一般社団法人 日本魚類学会
雑誌
魚類学雑誌 (ISSN:00215090)
巻号頁・発行日
pp.20-021, (Released:2020-09-10)
参考文献数
17

A single large specimen [197.8 mm standard length (SL)] of the genus Chaunax Lowe, 1846 (Lophiiformes: Chaunacidae), captured during a commercial bottom trawl at a depth of 150–250 m off Cape Daio-zaki, Shima, Mie Prefecture, Japan on November 2016. Lacked markings on the body surface, thereby differing clearly from the three Japanese congeners (Chaunax fimbriatus Hilgendorf, 1879, Chaunax penicillatus McCulloch, 1915 and Chaunax abei Le Danois, 1978) known to date. Subsequently identified as Chaunax apus Lloyd, 1909, the specimen was characterized as follows: body without marking, reddish dorsally and paler ventrally (fresh condition), becoming uniformly whitish (preserved) ; tips of cirri on esca partially dark; dorsal surface of head lacking cirri; head length 39.3% SL; and 3 neuromasts in upper preopercular series, 3 in lower preopercular series, and 15 in pectoral series. The specimen represents both the northernmost and easternmost records of the species in the Pacific Ocean, in addition to being the first from Japanese waters. Intraspecific variation was noted in the count of spinules bridging the lateral-line complex (4–5 pairs in the present specimen vs. usually 3 pairs in previous reports of the species). The need for reconsideration of two of the three species groups recognized in the genus Chaunax [C. abei (including C. apus) and C. fimbriatus species groups] was discussed from the viewpoint of new morphological data obtained from the above specimen. The new standard Japanese name “Akafusen” is proposed for C. apus, in referring to its characteristic body shape and color.
著者
中島 淳 鬼倉 徳雄 松井 誠一 及川 信
出版者
The Ichthyological Society of Japan
雑誌
魚類学雑誌 (ISSN:00215090)
巻号頁・発行日
vol.53, no.2, pp.117-131, 2006-11-25 (Released:2010-06-28)
参考文献数
60
被引用文献数
12

Genuine freshwater fish faunas of 32 rivers in Fukuoka Prefecture, northern Kyushu, Japan, were surveyed between 1998 and 2005, in order to clarify their geographical distribution patterns. A total of 39 fish species/subspecies (10 families) were recorded in the field survey and from existing literature, a cluster analysis separating them into the Chikuzen-Chikugo and Chikuho-Buzen groups. The former was considered to include fauna influenced by mainland China and the Korean Peninsula, the latter being similar to the freshwater fish fauna of rivers flowing to the Seto Inland Sea. The freshwater fish species in Fukuoka were roughly divided into those that occurred in rivers regardless of river length and those that tended to be present in rivers exceeding a certain length. The genuine freshwater fish fauna in Fukuoka is considered to have evolved through geographical isolation and the restriction of river length.
著者
鈴木 良威
出版者
The Ichthyological Society of Japan
雑誌
魚類学雑誌 (ISSN:00215090)
巻号頁・発行日
vol.5, no.1-2, pp.12-14, 1956-01-30 (Released:2010-06-28)
参考文献数
8

(1) この報告はカマツカ口唇の粒状突起を組織学的に研究したものである。(2) 粒状突起上にはその構造から考えて味感球が存在する。そしてこの味感球は突起の先端部附近に多く集つており, その他の部位には比較的少ないかまたはまつたくない。(3) 味感球の形態および構造は, マドヂョウやシマドヂョウのそれと大差はない。(4) この研究結果から, カマツカ口唇の粒状突起は摂餌行動に際して有効に役立つことが推察される。
著者
宗原 弘幸 高野 和則 古屋 康則
出版者
The Ichthyological Society of Japan
雑誌
魚類学雑誌 (ISSN:00215090)
巻号頁・発行日
vol.37, no.4, pp.391-394, 1991-02-28 (Released:2010-06-28)
参考文献数
13

交尾型カジカ, イソバテングBlepsias cirrhosusの配偶子がいつ, どこで会合し受精開始するかを明らかにした.排卵した雌の卵巣腔から卵と卵巣腔液を取り出し, 一部の卵を海水または卵巣腔液に浸し, 24時間後にそれぞれの胚発生状態を観察した.その結果, 海水中の卵のほとんどは胚発生を開始していたが, 卵巣腔液中の卵は全く発生しなかった.しかし, これらの未変化の卵を海水に移すと, その多くが胚発生を開始した.また, 海水に浸す前の卵を光顕観察した結果, 多数の精子が卵門管内に侵入しているものの, 卵細胞質内への貫入は認められず.卵も第二減数分裂の中期にとどまっていることが確認された.以上の結果から, 本種では体内で両配偶子の会合は終えているが, 受精は産卵後海水中で開始することが明らかとなった.
著者
井原 彩笑 石崎 大介 向井 貴彦
出版者
一般社団法人 日本魚類学会
雑誌
魚類学雑誌 (ISSN:00215090)
巻号頁・発行日
pp.19-014, (Released:2020-07-03)
参考文献数
42

Biological invasions by non-indigenous populations are one of the most serious problems for the conservation of genetic resources in natural environments, due to the likelihood of such populations becoming established and negatively impacting the genetic integrity of indigenous populations through hybridization and introgression. In central Japan, freshwater fish populations have been isolated by the Ibuki-Suzuka mountains between the Ise Bay basin (Gifu, Mie and Aichi prefectures on the eastern side of the mountains) and Lake Biwa water system (Shiga, Kyoto, Osaka and other prefectures on the western side), subsequently becoming genetically divergent. On the other hand, nonindigenous populations of freshwater fishes have been introduced to the rivers of the Ise Bay basin as a consequence of transplantation of commercially important Ayu (Plecoglossus altivelis altivelis) being accompanied by other species from Lake Biwa. Because some serious genetic disturbance of some species has already been reported from the former system, it is necessary to clarify the magnitude of such invasions and introduce measures for the conservation of native populations. This study focused on Japanese dace, Tribolodon hakonensis, one of the most common local fishes, which exhibits genetic differentiation between the Ise Bay basin and Lake Biwa system populations. Due to the superficial similarity between Japanese dace and Ayu, a bycatch of the former has been transported with Ayu from Lake Biwa to the other areas. To understand the magnitude of invasions from Lake Biwa, the PCR-RFLP method was used to discriminate between indigenous and non-indigenous mitochondrial DNA (mtDNA) haplotypes of Japanese dace in Gifu Prefecture rivers of the Ise Bay basin. Non-indigenous mtDNA haplotypes (Lake Biwa types) were found to be highly abundant in dam reservoirs, while less so in rivers, suggesting that Lake Biwa dace more easily adapt to the lacustrine environment of dam reservoirs than to river environments.
著者
松本 清二 岩田 勝哉
出版者
The Ichthyological Society of Japan
雑誌
魚類学雑誌 (ISSN:00215090)
巻号頁・発行日
vol.44, no.1, pp.35-41, 1997-05-26 (Released:2010-06-28)
参考文献数
13
被引用文献数
1

Paternal egg guarding and mouthbrooding of larvae and juveniles were observed in the swamp-eel, Monopterus albus. 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.
著者
谷 良夫 林 亮太朗 髙田 一翔 大路 紘裕 入江 祐樹 今村 拓未 早川 祐 向井 貴彦
出版者
日本魚類学会
雑誌
魚類学雑誌 (ISSN:00215090)
巻号頁・発行日
pp.18-002, (Released:2019-03-29)
参考文献数
24

Nuclear DNA (nDNA) markers were developed to distinguish between the closely related brackish water gobies Tridentiger brevispinis and T. obscurus. Although genetic differentiation of the two species has already been demonstrated by allozyme analysis in previous studies, the nucleotide sequences of mitochondrial DNA (mtDNA) haplotypes were similar and often shared by introgressive hybridization, obscuring the identification of the two species by mtDNA markers. In this study, one mtDNA gene [cytochrome b (cytb)] and four nuclear DNA gene regions [G protein-coupled receptor 85 (gpr85), ryanodine receptor 3 (ryr3), recombination activating protein 1 (rag1) and zic family member 1 (zic1)] were sequenced in 11 to 17 individuals, respectively, of T. brevispinis and T. obscurus, collected from the Mukogawa River, Hyogo Prefecture, Japan. The results for the mtDNA cytb region matched those of previous studies, the nucleotide sequences being very similar, with haplotypes shared among species. On the other hand, two (gpr85 and ryr3) of the four nDNA regions clearly differed between the two species, PCR-RFLP conducted on the former also showing specifically-different electrophoretic patterns. In order to confirm that nDNA PCR-RFLP could distinguish between the two species in other populations, additional samples of both from the Shonai River, Aichi Prefecture were subjected to and identified by the above method. In addition, eight individuals of putative F1 hybrid identified by allozyme analysis (three diagnostic loci) were also investigated. Although six of the eight putative hybrids included heterozygotes at both of the two nDNA PCR-RFLP loci, two individuals were characterized by a heterozygotic pattern at one locus, homozygotic at the other, both individuals possibly being F2 or backcross progeny, although initially misidentified as F1. The results indicated that nDNA markers may be helpful in distinguishing closely related Tridentiger species, which cannot be identified by mtDNA markers.
著者
Jack T. Moyer Martha J. Zaiser
出版者
The Ichthyological Society of Japan
雑誌
魚類学雑誌 (ISSN:00215090)
巻号頁・発行日
vol.28, no.4, pp.466-468, 1982-02-27 (Released:2010-06-28)
参考文献数
4

1980年8月15日16時30分, 三宅島の水深12mの地点で全長約90cmの2尾のウツボGymnotborax kidakaが産卵しているのを観察した.両者は尾部をゆるくからませていたが, 突然腹部を押しつけ合ってから離れた.その瞬間精子による水の白濁が観察された.卵は直径約2mmの丸い浮性卵で, 親魚による卵の保護は観察されなかった.1980年7月29目19時30分には, 岸近くの水深2.5mの地点で, 全長約25cmのUropterygtus necturus4尾が群がって行動しているのを観察した.これは産卵直前の行動と思われた.
著者
中島 淳 中村 朋史 洲澤 譲
出版者
一般社団法人 日本魚類学会
雑誌
魚類学雑誌 (ISSN:00215090)
巻号頁・発行日
vol.58, no.2, pp.153-160, 2011 (Released:2014-03-07)
参考文献数
48
被引用文献数
2

Examination of the morphological and genetic features of spined loach (Cobitis sp.) collected from the Oyodo River system, southern Kyushu Island, Japan, indicated that they represented a new taxon. The specimens were clearly distinguished from other known Japanese Cobitis species by their mitochondrial DNA sequences. In addition, the shape of the adult male lamina circularis differed to those of the C. sp. ‘yamato’ complex and C. biwae.