著者

水口 憲哉

出版者

The Ichthyological Society of Japan

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.17, no.4, pp.173-178, 1970

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秋川におけるオイカワ (<I>Zacco platypus</I>) の卵の生産について以下の点を明らかにした.<BR>1) 卵巣の重量および長さにおける増加は, 4月から6月にかけて急激におこり, 重量はその後7月, 8月と徐々に減少し9月には3月の状態にもどる.これにともない, 体重の増加およびその後の減少, 消化管内容物重量の増加がみられた.<BR>2) 1966年6月, 東秋留においては, 孕卵数 (F) と全長 (L (mm)) との間には, logF=-2.80+2.84logLなる関係がみられ, 投網で採集されたオイカワの雌100個体当りの孕卵量は約38, 000粒と推定された.<BR>3) 雌100個体当りの孕卵量はその後, 7月約24, 000粒, 8月約9, 000粒と減少してゆき, 潜在的な産卵能力を3ヶ月間にわたって維持していたと考えられる.

著者

馬場 吉弘 長田 芳和

出版者

The Ichthyological Society of Japan

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.52, no.2, pp.125-132, 2005

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To clarify the early life history of pale chub, <I>Zacco platypus</I>, and the mechanism for avoiding egg predation, the spawning behaviour, egg and larval distribution in spawning redds, and emergence time of larvae from the redds were investigated in the Saho River, Osaka Prefecture, Japan. In pair spawning, the male applied lateral pressure to the female, and stirred up the river bed with its anal and caudal fins when eggs were released. The female occasionally rotated in the redd at the end of spawning behaviour. Some satellite males and sexunknown individuals occasionally dashed into the spawning redd. Single females averaged 1026.4 mature eggs, spawning 94.5 eggs during each of 10.9 spawning acts per day. The number of eggs released during a single spawning act and buried successfully in the spawning redd following pair spawning was greater than that following spawning with surrounding individuals. More eggs were also found in the spawning redd after the female rotated. Eggs were buried 0-14 cm deep in spawning redds, those resulting from pair spawning being deeper than those from spawning with surrounding individuals. Larvae emerged around midnight from the spawning redd 7-8 days after spawning, emergence continuing for 3-5 days. Females were consid-ered to reduce the risk of egg cannibalism by spawning many times per day, mid-night emergence of larvae also being important for avoiding predation.

著者

岡本 誠 井田 齊 杉崎 宏哉

出版者

The Ichthyological Society of Japan

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.48, no.2, pp.113-119, 2001-11-26 (Released:2010-06-28)

参考文献数

16

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Larvae and a juvenile of two tetragonurids, Tetragonurus cuvieri (8 specimens, 6.8-18.5 mm BL) and T.atlanticus (4 specimens, 6.0-10.9 mm BL), collected by larval net from waters off eastern Japan, represent the first records of such from the North-West Pacific. Both species possessed spines on the interopercle and subopercle in their early life stages, a juvenile (18.5 mm BL) of T.cuvieri having one spine on each element, and a postflexion larva (10.8 mm BL) of T.atlanticus having two interopercle spines and one subopercle spine.

著者

片野 修 斉藤 憲治 小泉 顕雄

出版者

The Ichthyological Society of Japan

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.35, no.2, pp.203-211, 1988-09-20 (Released:2010-06-28)

参考文献数

19

被引用文献数

13

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Reproductive behaviour of the catfish, Silurus asotus was studied in temporary waters around paddy fields. Spawning occurred nocturnally during the first week from the initiation of irrigation. In reproductive activities, a male first energetically pursued a female with its head near to the female's belly (chasing) and then began to cling to the female's body from the side, bending its tail or head (clinging). Finally the male enfolded the female's body, with its anus near to the female's (enfolding). In some cases, 2-4 males pursued a single female and two males enfolded a female at the same time. Although no aggressive behaviour was evident between males, it was always the largest male that could most frequently approach and enfold the female. The mating pair moved a long distance in a ditch, paddy field and/or creek, performing reproductive activities. It is thought that the spawning site and period of spawning of the fish enable the larvae to avoid the danger of predation and to efficiently feed, firstly on plankton and later on larvae of other fishes which become abundant during the irrigation period. Although some eggs and larvae may die due to the drying out or high water temperatures of such unstable temporary waters, scattering eggs may reduce the incidence of the annihilation of the young.

著者

早川 洋一 瀧田 真平 菊池 一也 吉田 彩夏 小林 牧人

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

vol.59, no.2, pp.111-124, 2012-11-05 (Released:2014-12-02)

参考文献数

39

被引用文献数

2

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The importance of olfaction in spawning of medaka Oryzias latipes was established for the first time by observation of spawning behavior by fish subjected to an olfactory blockage. Experimental fish were prepared by (1) covering the nostrils on both sides (bilateral treatment), thereby excluding all olfactory stimuli, and (2) covering nostrils on one side only (unilateral treatment), thereby giving partial exclusion. A control group comprised untreated (intact). Experiments conducted for both males (bilateral male-intact female, unilateral male-intact female and intact male-intact female) and females (bilateral female-intact male, unilateral female-intact male and intact female-intact male) resulted in no spawning by intact females paired with bilateral males, whereas spawning occurred in intact females paired with both unilateral and intact males. Spawning also occurred when intact males were paired with intact, unilateral or bilateral females, indicating that olfactory stimuli were necessary for males to complete spawning, but not so for females. Spawning acts exhibited from pairing started by bilateral males-intact female pairs included “following” (initial act of following female), “positioning” (lateral courtship display), and “quick circle” (turning in front of female), but they did not include “contact” (bodies in contact posteriorly prior to gamete release), “wrapping” (male embracing female using their dorsal and anal fins during gamete release). On the other hand, intact and unilateral males participated in all of the above spawning acts, indicating that olfactory stimuli are indispensable for behavior concerning emitting semen.

著者

安田 富士郎 水口 憲哉

出版者

The Ichthyological Society of Japan

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.16, no.1, pp.31-34, 1969-06-15 (Released:2010-06-28)

参考文献数

4

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近年, Chryso phrysはPagrusに統一する提唱がなされているが, この2属に属する各3種について, 骨格とくに頭骨と脊椎骨について比較検討を行なったところ, 2属の間に著しい差が存在することが発見されたので, 現段階では, Ckrysophys属をPagrus属とは独立の属としてとり扱うのが妥当だと考える.

著者

Nikolay V. Parin Sergei V. Mikhailin

出版者

The Ichthyological Society of Japan

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.29, no.1, pp.27-30, 1982-06-30 (Released:2010-06-28)

参考文献数

8

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タチウオ類の1新種, Lepidopus calcarの記載を行った.本種はハワイ海嶺のコラハン海山の水深270~350mのところから採集され, 強いトゲ状の啓鰭第2棘を有することで他のLepidopus属魚類 (成魚) と区別できる.本種の脊椎骨数と背鰭鰭条数はL.caudatus (Euphrasen) のものより少なく, L.xantusi Goode et BeanおよびL.dubius Parin et Mikhailinのものよりも多い.

著者

藤原 恭司 伊東 正英 本村 浩之

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.64, no.2, pp.107-112, 2017-11-25 (Released:2018-06-19)

参考文献数

14

被引用文献数

3

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A single female specimen (256.4 mm standard length) of Acanthopagrus taiwanensis Iwatsuki and Carpenter, 2006, collected off Kasasa, Minami-satsuma, Kagoshima Prefecture, Japan, was characterized by the following combination of characters: 3½ scale rows between fifth dorsal-fin spine base and lateral line; 3 or 4 oblique scale rows on cheek; modally 15 total gill rakers; 3 or 4 rows of flattened molars on each side of upper and lower jaws; second anal-fin spine robust, bluntly pointed; ventral edge of infraorbitals above maxilla nearly straight; anterior edge of dorsal scaly area of head rounded; no black bars on head; a dark streak on each membrane of anal fin; and anal-fin soft rays whitish. The dorsal- head profile of the Japanese specimen was relatively straight, compared with the convex profile in the type specimens of the species. Other characters of the Japanese specimen, however, agreed well with those of A. taiwanensis given in the original description. Acanthopagrus taiwanensis is very similar to A. pacificus Iwatsuki, Kume and Yoshino, 2010, but can be distinguished from the latter by having 3 or 4 oblique scale rows on the cheek (vs. 6 or 7 in the latter), modally 15 total gill rakers (vs. 17), flattened molar teeth on each side of the upper and lower jaws (vs. rounded molariform teeth), a robust, relatively bluntly pointed second anal-fin spine (vs. acutely pointed), and whitish anal-fin soft rays (vs. blackish). Acanthopagrus taiwanensis has been previously recorded only from Taiwan, the Kagoshima specimen representing the first record from Japan and northernmost record for the species. The new standard Japanese name “Iwatsukikurodai” is proposed for the species and distributional implications of A. taiwanensis in Japanese waters discussed.

著者

生駒 歩 戸田 竜哉 長崎 哲新 河村 功一

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.69, no.1, pp.7-20, 2022-04-25 (Released:2022-05-06)

参考文献数

59

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Genetic characteristics of the Japanese torrent catfish Liobagrus reinii in the Miya River and neighboring drainages were investigated, using mtDNA and eight microsatellite (MS) markers, to evaluate the effects of man-made river structures on the distribution and genetic structure of the species. A total of 23 mtDNA haplotypes were detected, forming a star-like haplotype network, in which the population in the upper reaches (URM) formed a unique group. Many populations in tributaries of the middlelower reaches (MLRM) included unique haplotypes, although they shared a common haplotype located at the center of the network. MS markers indicated that genetic diversity tended to decrease upstream in the tributaries, coupled with a decline in effective population size and the existence of genetic bottlenecks. These phenomena were especially evident in tributaries isolated with weirs or dams. The fixation index RST, the values of which were smaller than FST, indicated isolation by distance (Mantel test), genetic differentiation among populations having occurred in recent years. Although a Bayesian-based assignment test showed unique clusters in the populations of isolated tributaries, including the URM population, many MLRM populations shared an admixture of multiple clusters, probably resulting from the dispersal of L. reinii. These results indicated that L. reinii in the Miya River included two conservation units, in the upper and middle-lower reaches, respectively. Man-made river structures seem to have caused fragmentation of the distribution of the species, resulting in small tributary populations suffering from genetic deterioration. In drainages neighboring the Miya River, the Isezi River population of L. reinii seems to be indigenous, owing to unique genetic characteristics in mtDNA and MS, whereas the sharing of genetic characteristics with the URM population of the Miya River indicated that the Akaba River population is likely to have been introduced from the Miyagawa Reservoir.

著者

大橋 慎平 今村 央 矢部 衞

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.60, no.2, pp.111-116, 2013-11-05 (Released:2015-12-26)

参考文献数

23

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Two specimens (131.5 and 147.0 mm in standard length) of the Gelatinous Blindfish Aphyonus gelatinosus Günther, 1878, collected from southern Japan (Kumano Sea and near the Tori Island, part of the Izu Island chain), were found among preserved specimens held by the Department of Natural Science, Faculty of Science, Kochi University, Kochi, Japan and National Museum of Nature and Science, Tsukuba, Japan. Aphyonus gelatinosus is recognizable in having only a single pelvic fin ray, high numbers of dorsal fin rays (92–118) and caudal vertebrae (46–55), few long gill rakers (3–4), and short predorsal length (26.5–30.5% SL). This species and genus is known from the Pacific Ocean, but not from the north Pacific including Japanese waters. Thus, these specimens are a new record of both the genus Aphyonus and A. gelatinosus for Japan.

著者

Gerald R. Allen

出版者

The Ichthyological Society of Japan

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.33, no.4, pp.409, 1987-02-20 (Released:2010-06-28)

参考文献数

4

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Allen (1980) がPseudomugtl furcatusを模式種として作ったPopondetta属は, Woodward (1978) が作った半翅類のPopondetta属に先取されていたので, 置換名としてPopondichthysを提唱する.

著者

木戸 芳

出版者

The Ichthyological Society of Japan

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.31, no.1, pp.83-85, 1984

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北海道網走沖のオホーツク海から, ダンゴウオ科のヒゲダンゴ<I>Eumicrotremus barbatus</I>が1個体得られた.本種はこれまで, アリューシャン列島のIgitkin島沿岸および千島列島のParamushir島沖から, それぞれ1個体ずつが知られているにすぎず, 本標本は第三番目の記録であり, また日本初記録である.<BR>本種の特徴として, 体のほぼ全域に皮質突起が分布することがあげられていたが, 本標本では願, 第1背鰭および尾部にのみ認められた, この相違は個体変異と考えられる, しかしながら, 少なくとも皮質突起が存在すること, .第1背鰭が高いこと, 鼻孔および鯉蓋から下顎にかけての感覚孔は管状で, それらが非常に長いこと, また両眼間隔域に骨質瘤状突起を欠くことにより, 本種はイボダンゴ属の他種と容易に区別される.

著者

向井 貴彦 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

vol.57, no.1, pp.75-76, 2010 (Released:2014-03-05)

参考文献数

7

著者

福地 伊芙映 立原 一憲

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

2022

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<p>The Daito (Borodino) islands, comprising three riverless oceanic islands (Minami-daito, Kita-daito and Oki-daito Islands) mostly bounded by rocky coasts, are the only southern Japanese islands located between the Ryukyu Archipelago and the Ogasawara islands. Identification of the mullet fauna on such oceanic islands should provide a clue to the dispersal ability of the family. Field surveys at Minami-daito and Kita-daito Islands were conducted in October 2019 and March 2020 resulting in five (<i>Chelon macrolepis</i>, <i>Crenimugil crenilabis</i>, <i>Ellochelon vaigiensis</i>, <i>Mugil cephalus</i>, <i>Oedalechilus labiosus</i>) and four mugilid species (<i>Ch. macrolepis</i>, <i>Cr. crenilabis</i>, <i>Neomyxus leuciscus</i>, <i>O. labiosus</i>) being collected from the respective islands. In addition, a specimen of <i>Moolgarda seheli</i> previously collected from Minami-daito Island, was found in the collection of the National Museum of Natural and Science (NSMT). All seven mugilid species are here recorded for the first time from the Daito Islands, supported by voucher specimens. A detailed description is provided for each species.</p>

著者

北村 淳一

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.195-198, 2011 (Released:2014-03-07)

参考文献数

10

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Freshwater mussel (family Unionidae) utilization for oviposition by Sarcocheilichthys variegatus variegatus was investigated in a drainage ditch and the Harai River. Twenty five freshwater mussels in Pronodularia japanensis (4% of 616 individuals examined) in a drainage ditch connected to the Kushida River hosted S. v. variegatus eggs, compared with none of two other freshwater mussel species, Inversidens brandti and Unio douglasiae douglasiae. In the Harai River, eight freshwater mussels (3 I. brandti, 2 Obovalis omiensis, 1 Lanceolaria grayana and 1 Anodonta spp.) (2.7% of 290 individuals examined) hosted S. v. variegatus eggs, compared with none of P. japanensis and U. d. douglasiae. Among the available freshwater mussel species, U. d. douglasiae may be only one selected against for oviposition by S. v. variegates.

著者

佐藤 行人 西田 睦

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.56, no.2, pp.89-109, 2009 (Released:2014-03-05)

参考文献数

151

被引用文献数

1

著者

谷 順彦 坂田 和男

出版者

The Ichthyological Society of Japan

雑誌

魚類学雑誌 (ISSN:18847374)

巻号頁・発行日

vol.24, no.1, pp.1-11, 1977

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日本産フナの有効な分類基準を得るため, それらの筋漿蛋白像をデンプンゲル電気泳動法により分析した。デンプンゲル泳動像はデンプンの質, ゲルのデンプン濃度, ゲルと電極槽の緩衝液のpHなどの要因の影響を受け, 若干変化した。そこで種内および種間変異を最も明瞭に示す実験条件下で, 分類学上重要ないくつかの地点から採集したフナ類の筋漿蛋白像を比較したところ, それらは基本的4型に類別された。第1型はCarassius buergeriの4亜種;キンタロウブナ, キンブナ, ニゴロブナ, ナガブナを含む。第1型は1遺伝子座の2対立遺伝子に支配される3変異型, 1-A, 1-AB, 1-B型に細分される。キンブナ類のA遺伝子頻度は地域によって異なり, 0~1.00の範囲で変動した。<BR>第II型にはギンブナが含まれる。第II型もまた4変異型に細分されるが, バンドの数とそれらの濃度などから判断して, これらの変異が単に有性生殖集団内における共通の座の対立遺伝子による変異とは考え難い.これら4変異型のうちII-1およびII-3型は霞ヶ浦に多く, II-2型は西日本に多く, II-4型は霞ヶ浦でわずかに認められた.ゲンゴロウブナは例外なく第III型に含まれた.ヨーロッパブナは目本産フナのどの泳動像にもあてはまらないが, キンブナの像にいくぶん似たところが認められた。

著者

松浦 啓一 戸田 実

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.1, pp.91-93, 1981

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本邦初記録のケショウフグ (新称) <I>Arothron mappa</I>とワモンフグ (新称) <I>A.reticularis</I>が沖縄本島から採集された.<BR>ケショウフグは, 腹側面に一大黒斑を有すること, 体の背方に虫食い状の暗褐色模様を有することで他のモヨウフグ属の種類と容易に識別できる.ワモンフグは, サザナミフグ<I>A.hispidus</I>に似ているが, 眼の周囲に環状の白色線があること, 体の背面と側面に多数の白色縦線をもつことで識別される.<BR>Beaufort in Beaufort and Briggs (1962) は, ワモンフグの尾柄長が尾柄高より小さく, サザナミフグでは逆に尾柄長が尾柄高より大きいと報告している.しかし翁今回得られたワモンフグの尾柄長は明らかに尾柄高より大きく, これらの部位の関係には種内変異があることを示唆した.

著者

藤田 朝彦 大浜 秀規 細谷 和海

出版者

The Ichthyological Society of Japan

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.52, no.1, pp.21-26, 2005-05-25 (Released:2010-06-28)

参考文献数

19

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Phoxinus lagowskii yamamotis is a small dace-like cyprinid, endemic to Lakes Yamanaka and Motosu at the northern base of Mt. Fuji. The fish was categorized as Data Deficient (DD) in the Japanese Red Data Book (2nd edition). Morphological comparisons between the type series of “Moroco yamamotis” and syntypes of “P.steindachneri” revealed a distinction in caudal peduncle height, the former showing extreme values, lower than for other individuals from same river basin and adjacent rivers. Phoxinus lagowskii yamamotis may have been a lacustrine population from which an ancestoral population of P.lagowskii steindachneri evolved following adaptations to a lentic environment. Several specimens were collected from an outlet of L. Yamanaka. A relationship between these specimens and the lacustrine “M.yamamotis” group is suggested, the assemblage being in need of conservation as an evolutionarily significant unit.

著者

藤田 清

出版者

The Ichthyological Society of Japan

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.43, no.1, pp.27-30, 1996-05-31 (Released:2010-06-28)

参考文献数

6

被引用文献数

1