著者

馬渕 浩司 瀬能 宏 武島 弘彦 中井 克樹 西田 睦

出版者

日本魚學振興會

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.57, no.1, pp.1-12, 2010-04-26

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琵琶湖に生息するコイの中には、ユーラシア大陸のコイとはミトコンドリア(mt)DNAの塩基配列で明瞭に異なる個体が存在することが、2005年に明らかにされた。これらの個体が保有するmtDNAは、当初は琵琶湖固有のハプロタイプと考えられたが、その後の研究で、近縁あるいは同じハプロタイプが国内の他の水域からも発見され、現在では、日本在来のハプロタイプ(在来型ハプロタイプ)の一つであると考えられている。在来型ハプロタイプの存在は、「日本のコイはすべて中国から移殖したものである」としたJordan and Fowlerへの強力な反証であり、古琵琶湖層からの咽頭歯化石の発見や、縄文遺跡からの咽頭歯の出土と併せて、日本には有史以前から在来のコイが分布し、現在もそれに由来するコイが生息することの明白な証拠となっている。本研究では、琵琶湖内における在来系統の分布状況を知る第一歩として、湖内の各所から採集された750個体以上のコイについてmtDNAの型判別を行い、各生息場所における在来型、導入型ハプロタイプの出現頻度を調べた。また、2004年に猛威をふるったKHVの在来系統への影響を評価するため、蔓延時に湖岸で斃死していた100個体を超えるコイのmtDNA型判別も行い、上の結果と比較した。

著者

Seirô KIMURA

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.14, no.1-3, pp.17-25_2, 1966-08-20 (Released:2010-06-28)

参考文献数

24

被引用文献数

3

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The life history of Hucho perryi (BREVOORT) was studied in the Faren River in northwestern Nemuro, Hokkaido, from late April to early June, 1960. H. perryi is a salmonid fish, which has flattened head, wide gape with stout teeth, many dark dots on the body and larger scales than those of other salmonid fishes (Pl. 4, A). This fish is distributed in the streams and lakes of Hokkaido, southern Kurile Islands and Sahalin.From April to May after thawing of ice in the river, this fish is observed in deep pools with rocks or many sunken timbers (Fig. 2), and in June when the water temperature rises about 10°C the fish is found also in the shallow and swift waters as well as deep pools. The stomach contents of 22 specimens, 2.9 to 56.0cm in total length, were examined. The larvae of aquatic insects, especially Plecoptera and Tricoptera, were eaten by the fry from 2.9 to 3.2cm. These diets were occurred commonly in the stomach of juveniles from 14 to 18 cm, and loarch, Barbatura toni oreas (JORDAN and FOWLER), were occasionally found together with the insect larvae. The fish larger than 30cm did not eat the insect larvae but took mainly the loarch. Although chum salmon fry, Oncorhynchus keta (WALBAUM), were found as the same time in the river where the examined fish were captured, they were not eaten by this piscivorous fish.The spawning season of this fish seems to extend from mid-March after breaking of ice to late April in Nemuro district. The knowledge about maturation was a little. The author obtained three mature males larger than 55cm, and also observed one mature female measuring 93 cm from the Shibetsu River. A spawning redd was found in the tributary pouring into the Furen River at Mimakka (Fig. 3), and 1, 358 eyed eggs in all were taken from this redd on May 22. These eggs were salmon pink in color and measured 5.8 to 6.4mm in diameter. They were brought into the laboratory of Nemuro Branch of Hokkaido Salmon Hatchery, and began to hatch on May 28. The alevins were reared until the yolk sac were completely absorbed.The newly hatched alevins preserving in 70% alcohol were measured 15.1 to 16.6mm in total length (Pl. 4, D). About 40 days after hatching, the alevins attained to 24.0 to 25.6mm. Two-thirds of the yolk sac were consumed and parr marks began to appear vaguely on the body side (Pl. 5, A). It took 52 days for the alevins to absorb completely the yolk sac at the water temperature of 6.0°to 11.3°C. The fry just after consumed the yolk were measured 28.1 to 28.5mm (Pl. 5, B), and they grew up about 38mm by August (Pl. 5, C).

著者

大島 正満

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.5, no.1-2, pp.1-11, 1956-01-30 (Released:2011-02-23)

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Kuma River of the Kumamoto Prefecture is famous in producing “ayu, ” Plecoglossus altivelis, of good quality, due to the suitable environmental conditions. Quite recently, however, utilization of the stream for the sake of generation of electricity necessitated to erect the darn of 34 meter high at the down stream in order to construct water reservoir. The Prefectural Government started the works last year and the dam. which is not provided any fish ways has been completed on 10 th of December, 1954, shutting up completely the passway of the anadromous fishes especially.Consequently, complains of fishermen and inhabitants of the upper streams opposing to the policy of the Government paying no attention for fish culture, especially to keep good name of Kuma River in “ayu” fishing, became furious. In order to solve this hard problems, viz, electricity nor fishing industry, authorities of the Government promissed to liberate large number of “ayu” fry in the upper streams per year, to meet the both ends.This attempts has been fulfilled for the first time in the spring ot the present year since, fries of sea-run form caught at the estuary of Kuma River and other parts in Kiushu as well as dwarf land-locked form of the Lake Biwa and Ikeda being libertated in the main and branch streams of Kuma River.In the present paper are shown morphological differences between sea-run form of “ayu, ” grown at the both sides of the dam; effect of suitable baits upon development of land-locked dwarf form of “ayu” originated in the Lake Ikeda ; distinction between sea-run form and land-locked form of “ayu” after fattening, from the stand-point of scale figurations, etc.

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.20, no.2, pp.107-112, 1973-09-10 (Released:2011-07-04)

参考文献数

19

被引用文献数

1

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Morphology of three forms of Oncorhynchus rhodurus Jordan and McGregor were studied.In comparison with the fluviatile form and the lacustrine form in Lake Biwa, characters of the sea-run form resemble those of the fluviatile form, and differ from those of the lacustrine form in Lake Biwa in number of pyloric caeca, transverse scales, ventral fin rays, and in crimson spots on lateral body (Figs.4-6, Table2).The sea-run form shows the following characters: the body color is silvery;the tip of the dorsal fin is dipped with jet black;crimson spots are scattered on the lateral side (Fig.2).Its smolt shows following characters;the body color is silvery;parr marks have disappeared;scales are easily taken off;the tip of the dorsal fin is dipped with jet black;the posterior margin of the caudal fin is edged with jet black;crimson spots are scattered on the lateral side (Fig.2).

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.20, no.4, pp.225-234, 1973-12-31 (Released:2011-07-04)

参考文献数

30

被引用文献数

2

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1.降海型アマゴの変態は, 河川で生活1年目の秋頃から起こり, 雌に多く現われる.2.満1年に達したスモルト (体長11~19cm) は, 冬季伊勢湾に降海し, 湾内の水温が低い期間 (冬~春) に, 主として魚類を食して生活し, 急速に成長する.3.生活2年目 (1+) の5月頃, 体長27cm (モード) に達して河川を湖上し, 上流で9~10月頃産卵する.4.降海型アマゴの鱗相は, 冬帯の形成を10月下旬にすでに終了している.降海後は鱗の周縁に特に幅広い隆起線を多数形成する.5.伊勢湾へ降海するマス (降海型) は, 上流域に生息するアマゴ (河川型) と同一の個体群に属すると考えられる.

著者

遠藤 広光 岡村 収

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.38, no.4, pp.p433-437, 1992-02

著者

松浦 啓一 坂井 恵一 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.3, pp.p372-376, 1993-11

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.22, no.3, pp.183-185, 1975-12-29 (Released:2011-02-23)

参考文献数

7

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Four large specimens of freshwater salmons, 365 to 567 mm in total length, were collected in Kuzuryu Dam, and in the upper streams of Takinami River and Kuroko River, Fukui Prefecture.These specimens are two or three years old, and have higher depth of body than that of the salmonid fish“Biwamasu” (lacustrine form) in Lake Biwa, and the crimson spots on both sides of body.These spots are similar to those of the smaller“Amago”, but differ from those of the“Biwamasu”.The number of transverse scales of the present mateial is more than those of the“Biwamasu”.From the comparison described above and the fact that the“Amago”of Oncorhynchus rhodurus Jordan and McGregor was introduced artificially into the upper streams of Kuzuryu River, Takinami River and Kuroko River before, the author identified the present material as the“Amago”O.rhodurus which inhabits the rivers.

著者

桑原 雅之 井口 恵一朗

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.54, no.1, pp.15-20, 2007-05-25 (Released:2011-06-08)

参考文献数

39

被引用文献数

1

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Salmon (Oncorhynchus masou) of uncertain subspecific identity migrating upstream in inflowing rivers around Lake Biwa much earlier than the main autumn migration of Biwa salmon (O. m. subsp.) raised the question of whether or not summer migrating Biwa salmon individuals might be mixed with the very similar redspotted masu salmon (O. m. ishikawae). Accordingly, 17 individuals of summer migrating salmon were captured from inflowing streams of Lake Biwa from May to July in 1998 and 1999, and their morphological characters and mitochondrial DNA analyzed. Twelve individuals were found to be Biwa salmon and three to be redspotted masu salmon, based on both morphological and DNA characters. The remaining two individuals could not be identified owing to discordant the morphological and molecular characters. The study confirmed the occurrence of summer upstream migration in Biwa salmon. Although the majority of Biwa salmon migrate upstream just before the breeding season in autumn, the possibility exists that summer migrating individuals might contribute to the genetic diversity of the Biwa salmon population.

著者

前川 光司

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.20, no.4, pp.245-247, 1973-12-31 (Released:2011-02-23)

参考文献数

8

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The sea-run form of the Dolly Varden (Salvelinns malma) has not been recorded from Hokkaido, excepting two anadromous males (Flikita, 1962; Ishigaki, 1967).On April 23rd, 1972, a silvery specimen of the Dolly Varden, immature female and 153.1 mm in total length, was collected from the Shoji River in the Shiretoko Peninsula, northeastern Hokkaido. It was identified as a smolt of the Dolly Varden, and is a new record from Hokkaido. The tip of the dorsal fin was jet black and posterior margin of the caudal fin was faintly edged with black.No significant differences were recognized.in the number of vertebrae, pored scales, pyloric caeca, and gill rakers, between the smolt and river resident form from the same district.It was considered, from the point of geographical variation of the fish and geographical aspects of the Shiretoko district, that the fish might have hatched in the Shoji River.

著者

前川 光司

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.355-358, 1985-11-28 (Released:2010-06-28)

参考文献数

10

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982年と1983年に, 然別湖産オショロコマ (ミヤベイワナ) が多回産卵することを利用して, タッグ装着による母川回帰性を調べた。前年に湖上した同じ河川に翌年再び湖上する個体の比率は極めて高かった。また, 湖中で捕獲し標識後湖に再放流した個体の各河川への瀕上率は, 各河川の総淵上数の比率とほぼ比例していた.このことから, このオショロコマは然別湖水系内で母川回帰することが示唆された。

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.27, no.3, pp.p215-236, 1980-11

著者

新井 良一 小林 弘

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.20, no.1, pp.1-6, 1973-06-20 (Released:2010-06-28)

参考文献数

25

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日本産ハゼ科魚類13種類の核型をコルヒチン処理した魚の鰐と消化管で観察した.体細胞の染色体数は2n=40, 2n=44, 2n=46, 2n=48の4型で, 各染色体の形態については, (1) すべての染色体がsubtelocentrics もしくはacrocentricsのものと, (2) metacentrics, submetacentricsおよびsubtelocentricsもしくはacrocentricsからなるものとが観察された.(1) のグループに属するものは, アシシロハゼAboma lactipes (Hilgendorf), 2n=40, マハゼAcanthogobius flayimanus (Temminck et Schlegel), 2n=44, ヨシノボリRhinogobius bruneus (Temmincket Schlegel), 2n=44, カワヨシノボリRhinogobiusflumineus (Mizuno), 2n=44, アゴノ・ゼChasmichthysdolichognathus (Hilgendorf), 2n=44, アベハゼMugilogobius abei (Jordan et Snyder), 2n=46, クモハゼBathygobius fuscus (Rüppell), 2n=48の7種類で, (2) のグループに属するハゼは, キヌバリPterogbius elapoides (Günther), 2n=44, ミミズハゼLuciogobius guttatus Gill, 2n=44, ヌマチチブTridentiger obscurus brevispinis Katsuyama, Aralet Nakamura, 2n=44, シマハゼTridentiger trigonocephalus (Gill), 2n=44, ウキゴリChaenogobiusannularis Gill, 2n=44, トビハゼPeriophthalmuscantonensis (Osbeck), 2n=46の6種類であった.

著者

金柱 陽子 酒井 治己 安田 富士郎

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.27, no.3, pp.p191-198, 1980-11

著者

明仁親王

雑誌

魚類学雑誌

巻号頁・発行日

vol.14, pp.167-182, 1967

被引用文献数

1