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

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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

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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

森 誠一 小北 智之 松田 征也

出版者

日本魚類学会

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.63, no.2, pp.148-152, 2016

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

vol.66, no.1, pp.53-62, 2019

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<p>Hybrids of <i>Rhinogobius biwaensis</i> and <i>Rhinogobius</i> 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 <i>Rhinogobius</i> specimens had <i>R. biwaensis</i> haplotypes, the remaining specimens having those of <i>Rhinogobius</i> sp. BF. In DAPC and STRUCTURE analyses based on microsatellite data, all specimens examined showed intermediate status between <i>R. biwaensis</i> and <i>Rhinogobius</i> 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 <i>Rhinogobius</i> fishes from Japan, confirmed by nuclear and mitochondrial DNA data. Hybrid <i>Rhinogobius</i> specimens from the ponds had 5–17 predorsal scales, an intermediate range between those of non-hybrid <i>R. biwaensis</i> (0–6) and <i>Rhinogobius</i> sp. BF (11–20). However, in appearance they were more similar to <i>R. biwaensis</i> than <i>Rhinogobius</i> 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 <i>R. biwaensis</i> in having a narrower white posterior caudal fin margin. Further morphological differentiation of the hybrid specimens was not apparent.</p>

著者

石松 惇 喜田 潤

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.46, no.1, pp.1-13, 1999-05-25 (Released:2010-06-28)

参考文献数

84

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Increased concentrations of CO2 in the atmosphere will cause not only global warming but also raised partial pressure of CO2 and lowered pH in the ocean. These environment alterations may affect fish and other marine organisms. On the other hand, feasibility studies recently suggest that disposal of anthro-pogenic CO2 in the deep ocean could help reduce atmospheric CO2 concentrations. However, implementation of this strategy could have a significant environmental impact on marine life. These circumstances provide a background for the urgent need of further studies concerning the effect of CO2 on fish. In this paper we sum-marize the literature reporting on CO2 effects on fish and discuss the required research work for the future.The present knowledge from the literature is summarized and categorized into oxygen consumption rate, respiration activity, oxygen carrying capacity by red blood cells, blood gas, blood circulation, CO2 receptor, acid-base balance, endocrine, growth, toxicity and anesthesia. Most of the experimental fish used in the literature are freshwater species (carp and rainbow trout have largely been used). There were only few examined marine species (three bottom dwelling species of elasmobranch and teleost, respectively). Since experiments have only been carried out on adult fish, experiments on reproduction and the early life stage should be performed to clarify effects over the life cycle and to predict long term hypercap-nic effects. Physiological studies have mostly been concerned with the acid-base balance and we need further information on maturation and endocrine to evaluate long term hypercapnic effects on fish populations. Changes in swimming behavior and its mechanism must also be examined.Although the early phase of future study on CO2 effects on fish has to start using shallow-water species, deep-sea species should be considered in concern with the disposal of CO2 in the deep ocean. Furthermore, extrapolating data from one well researched species to evaluate implications on the ecosystem as a whole would be hazardous. In order to validate an appropriate resolution to the global warming problem, a multi-disciplinary approach to the effects of CO2 disposal utilizing spe-cialists from fields such as marine biology, fisheries and physical oceanography is clearly necessary.

著者

山崎 裕治 中村 友美 西尾 正輝

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.2, pp.143-148, 2010 (Released:2014-03-06)

参考文献数

24

被引用文献数

1

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In order to establish a feasible conservation program for the Itasenpara bittering (Acheilognathus longipinnis), the genetic population structure was determined on the basis of five microsatellite loci for wild and captive populations from Himi City, Toyama Prefecture, and the Yodo River system, Osaka Prefecture. An endemic genetic feature was found in each of the Toyama and Osaka regional populations, indicating that each should be treated as a separate unit in any future conservation program. The degree of genetic diversity in the Toyama populations tended to be lower than that in the Osaka population, being related to the population size and/or population demography. In the Toyama region, captive populations showed an equal degree of genetic diversity as the wild populations, probably due to a relatively short period of captive breeding as well as continuing introductions of wild individuals.

著者

大橋 慎平 千葉 悟 清藤 秀理

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.18-029, (Released:2018-09-25)

参考文献数

14

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An increase in gill raker numbers in skipjack tuna (Katsuwonus pelamis) was observed during the development of juvenile and young stages (26–187 mm in standard length (SL)). Examination of 104 individuals showed obvious increments in number with growth, until 80–100 mm SL. Subsequently, numbers increased slowly (to 59 in the largest specimen), indicating that gill raker development in skipjack tuna is slower than in other scombrid fishes, such as Thunnus. However, gill raker numbers in juvenile and young skipjack tuna stages remain a useful taxonomic character.

著者

松浦 啓一 片山 英里 吉野 哲夫

出版者

日本魚類学会

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

pp.18-013, (Released:2018-06-21)

参考文献数

15

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Seven specimens of Tylerius spinosissimus (Regan, 1908) were washed up by a typhoon onto a beach at Nakagusuku in Okinawa-jima Island on 17 August 1997. This species has been rarely collected, being known from only a few localities in the tropical Indo-West Pacific. In addition to the seven specimens from Okinawa-jima Island, eight specimens collected off northwestern Borneo in the South China Sea by TV Oshoro-maru in November 1973 were found in the fish collection of the Hokkaido University Museum, Hakodate. Examination of the 15 specimens have revealed that the species is distinguished from other pufferfishes by the following characters: dorsal-fin rays 9–11, anal-fin rays 6–7, pectoral-fin rays 15–17, body somewhat squarish in cross-section, snout short with dorsal surface dropping abruptly anterior to eye, nasal organ a short papilla with two nostrils, eye dorsally adnate only, ventrolateral skin fold absent, body anterior to anal-fin base densely covered by small spinules, dorsal and ventral lateral lines running on lateral surface of body; frontals broad across interorbit, almost completely covering dorsal surface of ethmoid; prefrontal strongly down-curved. A juvenile of Tylerius spinosissimus ca. 10 mm in total length was photographed at 1 m depth in Suruga Bay, on the west coast of the Izu Peninsula, Honshu, Japan, in November 2008. This small specimen was similar in color to adults of T. spinosissimus: the dorsal half of the body being brown with a dark brown blotch just behind the dorsal corner of the eye, the ventral half of body white, and all fins pale.

著者

明仁親王 目黒 勝介

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.26, no.2, pp.p192-202, 1979-09

被引用文献数

1

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

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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

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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

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

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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

望月 賢二 Solomon Gultneh

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.35, no.4, pp.421-427, 1989-03-15 (Released:2010-06-28)

参考文献数

2

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熊野灘および南シナ海で採集された標本をもとにスズキ科PercichthyidaeのノコバスミクイウオSynagrppsspinosusを西部太平洋から初めて記録した.本種はこれまでメキシコ湾からの原記載とスリナム沖からの標本によって知られているだけであった.そこでこれらをふくむ西部大西洋で採集された標本を調べ, 西部太平洋産の標本と比較した.その結果, 両者の間に重要な違いはなく, 同一種であるとの結論を得た.本種の形態的特徴は以下の通りである.腹鰭棘, 唇鰭第2棘, および第1背鰭第2棘の各前縁に明瞭な1小棘列を有する.第2背鰭棘に小棘列がない.磐鰭が2棘7軟条 (稀に8軟条) である.第1背鰭が9棘, 第2背鰭が1棘9軟条である.側線鱗数は29-31である.下顎側部に4-7本の大犬歯状歯列があり, そのすぐ外側に1列の微小歯列がある.脊椎骨は10+15である.本種はこれらの形質の組合せにより本科の他種と容易に区別できる.本種は底魚類の一種で, 主に100-500m水深の大陸棚および同斜面上部から底曳網類により採集されている.また, 本種の西部大西洋と西部太平洋という大きく隔たった分布について, 第三紀における海洋構造の変遷や気候の変化との関係で議論した.

著者

岩槻 幸雄 赤崎 正人 吉野 哲夫

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.1, pp.47-59, 1993-05-15 (Released:2010-06-28)

参考文献数

69

被引用文献数

1

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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

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.35, no.3, pp.236-242, 1988-12-15 (Released:2010-06-28)

参考文献数

31

被引用文献数

1 44

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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

加藤 文男

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.3, pp.197-204, 1978-12-15 (Released:2011-02-23)

参考文献数

21

被引用文献数

3

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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.

著者

加藤 文男

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.28, no.2, pp.184-186, 1981-08-15 (Released:2011-02-23)

参考文献数

6

被引用文献数

1

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Three specimens of the amago salmon, Oncorhynchus rhodurus, were caught off Chikubu Island in Lake Biwa, Shiga Prefecture, Japan. These specimens were females measuring 260-375 mm in standard length, with red spots on both sides of the body.The transverse scale counts above the lateral line were 27-32.Ridges of scales had disappeared in the apical margin of the scales.These characters resemble those of the amago salmon found in the Nagara River or Lake Suwa, and differ from those of the Biwa salmon found in Lake Biwa (Kato, 1973a, 1975a, b, 1978).Therefore the author identified the specimens as amago salmon.They are presumed to have descended in the smolt stage into Lake Biwa and to have grown there.

著者

澤志 泰正 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.41, no.3, pp.253-260, 1994-11-21 (Released:2010-06-28)

参考文献数

14

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現在の唯一の生息地である奄美大島において, リュウキュウアユは不連続な東西2地域 (住用・伊須湾域と焼内湾域) に分布する.この両地域の集団がどの程度独立であるかを明らかにするため, 生態学的側面および遺伝学的側面の両面から検討を試みた.まず, 遡上期における稚魚の分布を全島的に調査したところ, 東西2地域では従来通り本亜種の生息が確認できたが, それらを隔てる南部や北部地域の河川では本亜種は全く出現せず, 沿岸海域を通じての東西間の仔稚魚の移動の証拠は得られなかった.次に, 両地域の集団から得た標本にっいて電気泳動分析を行ったところ, 調べた28遺伝子座のうち多型的な2遺伝子座で, 遺伝子頻度の顕著な差異 (それぞれp<0.001) が認められた.以上の結果は, 東西両集団は, 相互の間でほとんど交流のない, 相対的に独立したものであることを示唆する.本亜種の保護を考える際には, こうした奄美大島における遺伝的多様性を慎重に考慮することが重要であると考えられた.

著者

岸野 底 四宮 明彦 寿 浩義

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.55, no.1, pp.1-8, 2008-05-15 (Released:2012-07-13)

参考文献数

28

被引用文献数

3

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Fasting Ryukyu-ayu (Plecoglossus altivelis ryukyuensis) larvae (newlyhatched, 15-20 day old and 50 day old individuals) subjected to ranges of experimental water temperature and salinity [15-21°C (2 or 3 steps) and 0-30 psu (3 or 4 steps), respectively] showed greatest survival rates in water temperatures of 15-18°C and salinity of 5-15 psu. Such water temperature and salinity ranges paralleled those of brackish water in the Yakugachi River during the early life stages of Ryukyuayu, and supported a field investigation which indicated that Ryukyuayu larvae occurred mainly in brackish water. The experimental result is probably illustrates the limits of osmoregulatory adjustment in larvae of this species.

著者

福島 路生 帰山 雅秀 後藤 晃 佐藤 拓哉

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.55, no.1, pp.49-55, 2008-05-15 (Released:2012-07-13)

参考文献数

73