著者
土居 隆秀 中村 智幸 横田 賢史 丸山 隆 渡邊 精一 野口 拓史 佐野 祐介 藤田 知文 TAKAHIDE DOI TOMOYUKi NAKAMURA MASASHI YOKOTA TAKASHI MARUYAMA SEIICHI WATANABE HIROFUMI NOGUCHI YUSUKE SANO TOMOFUMI FUJITA 栃木県水産試験場 (独)水産総合研究センター 東京海洋大学海洋生物資源学科 東京海洋大学海洋環境学科 東京海洋大学海洋生物資源学科 東京海洋大学海洋環境学科 東京海洋大学海洋環境学科 東京海洋大学海洋生物資源学科 Tochigi Prefectural Fisheries Experiment Station Freshwater Fisheries Research Division National Research Institute of FIsheries Science Department of Aquatic Biosciences Department of Marine Environmental Sciences Tokyo University of Marine Science and Technology Department of Aquatic Biosciences Department of Marine Environmental Sciences Tokyo University of Marine Science and Technology Department of Marine Environmental Sciences Tokyo University of Marine Science and Technology Department of Aquatic Biosciences
出版者
The Japanese Society of Fisheries Science
雑誌
日本水産学会誌 = Bulletin of the Japanese Society of Scientific Fisheries (ISSN:00215392)
巻号頁・発行日
vol.70, no.5, pp.706-713, 2004-09-15
参考文献数
28
被引用文献数
2 3

イワナ・ヤマメ養殖魚の小型魚と大型魚の釣獲放流後の死亡率と成長を実験池において調査した。餌釣り,毛鈎釣りともに,口腔にかかった鈎を除去した場合,いずれの魚種においても死亡率は低かった。餌釣りで口腔より奥にかかった鈎を除去した場合,イワナ小型魚とヤマメ大型魚では死亡率は高かった。口腔にかかった毛鈎を残留させた場合,イワナ大型魚では死亡率は高かった。死亡のほとんどが釣獲放流後14日以内に観察された。釣獲方法,鈎がかりの部位,鈎の処理方法は成長と肥満度に影響しなかった。Mortality and growth of Japanese charr Salvelinus leucomaenis and masu salmon Oncorhynchus masou masou after catch and release were examined in experimental ponds, using hatchery-reared fish divided into smaller (< 15 cm in total length) and larger (> 15 cm) size groups. When the hooks stuck in the mouth and were removed for both species, the mortality within 21 days after catch and release was low (O-15.0%) for each size and fishing gear (bait and fly-fishing, using barbed hooks). When hooks in bait fishing were removed from the esophagus, mortalities were relatively high (66.7% in the smaller sized charr and 45.0% in the larger sized salmon). All the fish of both species and both size groups were alive when the hooks in fly-fishing were removed from the mouth, however the mortality was relatively high (40.0%) when the hooks were not removed from the mouth of the larger sized charr. 0f all the fish that died, 63.0 and 98.1% died within 3 and 14 days after catch and release, respectively. There was no negative effect of the catch and release on the growth and condition factor of both species and both size groups. These results suggest that catch and release is effective for conserving Japanese charr and masu salmon populations in rivers and lakes when anglers pay attention to the removal of hooks.
著者
Kaworu Nakamura
出版者
The Japanese Society of Fisheries Science
雑誌
Fisheries science (ISSN:09199268)
巻号頁・発行日
vol.60, no.3, pp.271-274, 1994 (Released:2008-06-30)
参考文献数
10
被引用文献数
3 5

To prove air breathing, common carps Cyprinus carpio acclimated at 27°C were subjected to the following experiments after a 3 h precooling period in water by decreasing the temperature to 17°C. 1) Each fish with a plugged oesophagus was accommodated in a respiratory chamber connected to gas meters for measurements of concentration changes of O2 and CO2 at 17°C. 2) Each group of five fish was exposed to 17°C air to examine its 100% survival time. Over time, the O2 concentration decreased and that of CO2 increased. The CO2 concentration showed a saturation curve. Mean respiratory rates in the initial period of 1-1.5 h were 51±24.2ml O2 per kg•h and 24±5.8ml CO2 per kg•h. The 100% survival time with a 3 h precooling was 4.5 h. As a conclusion, carp breathe following an incomplete CO2 excretion even in air.
著者
松川 康夫 張 成年 片山 知史 神尾 光一郎 YASUO MATSUKAWA NARITOSHI CHO SATOSHI KATAYAMA KOICHIRO KAMIO (独)水産総合研究センター中央水産研究所 (独)水産総合研究センター中央水産研究所 (独)水産総合研究センター中央水産研究所 (株)東京久栄 National Research Institute of Fisheries Science Fisheries Research Agency National Research Institute of Fisheries Science Fisheries Research Agency National Research Institute of Fisheries Science Fisheries Research Agency Tokyo Kyuei Co. Ltd.
出版者
The Japanese Society of Fisheries Science
雑誌
日本水産学会誌 = Bulletin of the Japanese Society of Scientific Fisheries (ISSN:00215392)
巻号頁・発行日
vol.74, no.2, pp.137-143, 2008-03-15
参考文献数
60
被引用文献数
8 28

我が国のアサリRuditapes phillipinarumの総漁獲量は,1960年には10万トンであった。その後,一部に漁場の埋め立てによる減少があったにも関わらず,1982年には14万トンまで増加したが,1984年から激減して,1994年にはわずか3分の1程度(5万トン)になり,その後もこの水準が続いている。著者らはアサリの生態や資源に関する報告を総括し,1984年以降のアサリ漁獲量の激減の主要因を過剰な漁業活動,すなわち親貝と種貝用の稚貝に対する過剰漁獲と結論づけた。それ以外にも,周年の過剰操業による底質擾乱は,稚貝の生残率低下を助長した可能性が高いと考えられる。The annual catch of the Manila clam Ruditapes phillipinarum in Japan increased from 100 thousand tonnes in 1960 to 140 thousand tonnes in 1982. This increase occurred despite a local decrease in coastal fishing grounds due to land reclamation and helped to balance overall production. Since 1984, however, the catch has decreased drastically to only 50 thousand tonnes and has remained at this low level. The authors reviewed published reports relevant to the ecology and resources of Manila clam and concluded that the main factor responsible for the drastic decrease in catch is over-fishing. Over-exploitation of the adults and sub-adults significantly affected and damaged reproduction and source-sink relationships among localities. Disturbance of the clam habitat throughout the year by heavy fishing gear may also be responsible for lowering the survival rate of the juveniles.
著者
川尻 稔
出版者
The Japanese Society of Fisheries Science
雑誌
日本水産学会誌 (ISSN:00215392)
巻号頁・発行日
vol.15, no.4, pp.166-172, 1949

I Studyed on the influence of the population density of Killie-fish (<i>Oryzias latipes</i> T & S) upon the number of spawn eggs, hatching-rate, and consequentry upon the reproduction. In the present study these fishes were cultured a pail (1 ?? and -1 ?? ) 1, 2 and 4 pairs respectively in 3 glass bowls (diameter 30cm, depth 15cm) filled with 7 L. of water, and were given food daily into each groups at the ratio of 1, 2, 4, and the rearing water of each bowl were changed 2-3 times in a week at the same ratio as above. Their spawned eggs were counts 3-4 times every day, and transfered into each 3 glass bottles (capacity 200cc) which filled water at the above ratio also, and disinfected by 0.5% of formalin solution every 4-5 days, and the fry which hatch out were counted every day. These experiments were carryed on two times in the same way.<br> Putting these results together, the number of eggs spawned one female a day decreases, so, accordingly, the number of eggs spawned one female decreases, and besides the hatch-rate have a tendency of depresses, in proportion to the population density of the fishes increases, and by the accumlation of these factors the rate of reproduction of the fish decreases.<br> Satisfied the equation <i>y=ax<sup>b</sup></i>, where <i>y</i> represents the number of eggs spawned per i female a day, or hatching-rate, <i>x</i> density of population, <i>a</i> and <i>b</i> are the characteristic constants.
著者
山本 勝太郎
出版者
The Japanese Society of Fisheries Science
雑誌
日本水産学会誌 (ISSN:00215392)
巻号頁・発行日
vol.51, no.11, pp.1755-1760, 1985

To obtain a standard for rope usage, the tensile breaking strength of various ropes tied in ten different kinds of knots has been tested in both dry and wet conditions. The ropes tested were a polyethylene, a polypropylene, a mixed one consisting of polyethylene and vinylone which comprised a 3-strand laid rope, and a polyethylene 8-strand braided rope. The commercial size was 9mm in diameter for all ropes. "Dry condition" means that the knot samples were stored at normal temperature of a room, and "wet condition" means that the knot samples were soaked in water applying a pressure of 2.0kg/cm<sup>2</sup> for 12h. Results of tests for tensile breaking strength indicated that the optimum number of tucks in an eye splice was 4 tucks for the laid ropes, and 3 tucks for the braided rope. Percentages of the knot strength to the dry one of the eye splice although being somewhat different for both sample conditions and among the kinds of ropes tested, were roughly estimated as follows: 50% for the overhand knot and the single-sheet bend with end return, 55% for the double-sheet bend, 60% for the bowline knot and kakine-musubi and 95% for the short splice. Furthermore, percentages of the knot strength to the dry strength of the unknotted rope, if estimated as 90% for the eye splice, become 45%, 50%, 55% and 85% respectively.
著者
崔 相
出版者
The Japanese Society of Fisheries Science
雑誌
日本水産学会誌 (ISSN:00215392)
巻号頁・発行日
vol.28, no.11, pp.1082-1091, 1962
被引用文献数
4

The locular index of the shell, which was introduced by HOYLE, W. E. (1886), is considered to be one of the most significant species diagnoses for the cuttle-fish. As for <i>Sepia esculenta</i> produced in Japan, SASAKI (1910, 1929) observed two different groups of it with different locular indexes. Later, YAMAMOTO (1945), YASUDA (1951) and KOITO et al. (1956) infer, on the basis of difference in the locular index, the existence of local types of it. Hereupon, TOMIYAMA (1957), ISHIKAWA and IWAI (1958) and YAGI (1960) made clear after more detailed examination on the form and growth of the shell that the locular index changes continuously with the growth of the cuttle-fish.<br> The present author executed the hatching and growing of <i>Sepia escutenta, Sepia subaculeata</i> and <i>Sepielta maindroni</i>, while studying on the form and locular index of the shell as against the growth. The results thus obtained are:<br> 1) The shell of just-hatched <i>Sepia escutenta</i> has a length of 3.59 to 5.04mm (4.33mm in average), a width of 2.62 to 3.38mm (2.92mm in average) and 6 to 8 striped lines (7.0 lines in average). Characteristic of the shell is, as is compared with that of <i>Sepia subaculeata</i>, the meek-developed inner cone with a circular trimming. The last loculus is found protruding at the stage of a shell length 6.6 to 7.1mm, No spine is found at the rear end of the shell immediately after the hatching; they are formed at the stage of a shell length 5.1 to 5.5mm.<br> 2) <i>Sepia subaculeata</i> immediately after the hatching has a shell, 5.11 to 7.59mm long and 3.76 to 4.28mm wide, with 7 to 11 striped lines (8.1 lines in average). Compared with Sepia esculenta, the shell of this species has a much more developed inner cone with an acuteangled trimming. The spine at the rear end of the shell is recognizable even immediately after the hatching, and the last loculus appears at the stage of a shell length 30 to 35mm.<br> 3) The shell of just-hatched <i>Sepiella maindroni</i> is 3.04-3.31mm long and 1.66-1.79mm wide with 7-9 striped lines. No spine is found at the rear end of the shell. Its morphologi-cal characteristic such as the well developed last loculus constitutes an easier distinction from <i>Sepia esculenta</i> or <i>Sepia subaculeata</i>.<br> 4) The allometry expression applies well to the relation between shell-length and shell-width as well as to the relation between shell-lenth and shell-weight. On the curve of the relation of shell-length versus shell-weight, however, a slight inflection is observed at the point corresponding to the shell length of about 20mm for all of the three species.<br> 5) The locular index of the shell for the artificially reared individuals is 46-23 for <i>Sepia esculenta</i> (shell length 4-90mm), 41-25 for <i>Sepia subaculeata</i> (shell length 5-155mm), and 66-44 for <i>Sepiella maindroni</i> (shell lengtn 3-105mm). The index is greater in the youngling stage and decreases with the growtn.<br> 6) The shell locular index for <i>Sepia esculenta</i> varies a great deal with the growing condition. The index is large for the well-grown (42.3-37.9) and small for the undergrown (36.9-34.3).<br> 7) Though the locular index falls within a certain domain peculiar to each of the species and thus forms a species character, it is altogether a variable and, therefore, it involves a risk to judge species or presume the existence of local types just out of the index values.
著者
北上 誠一 村上 由里子 安永 廣作 阿部 洋一 加藤 登 新井 健一 SEIICHI KITAKAMI YURIKO MURAKAMI KOSAKU YASUNAGA YOICHI ABE NOBORU KATO KEN-ICHI ARAI 社団法人全国すり身協会 社団法人全国すり身協会 独立行政法人水産総合研究センター中央水産研究所 カネテツデリカフーズ株式会社 東海大学海洋学部 社団法人全国すり身協会 National Surimi Manufacturers Association National Surimi Manufacturers Association National Research Institute of Fisheries Science Kanetetsu Delica Foods Inc. School of Marine Science and Technology Tokai University National Surimi Manufacturers Association
出版者
The Japanese Society of Fisheries Science
雑誌
日本水産学会誌 = Bulletin of the Japanese Society of Scientific Fisheries (ISSN:00215392)
巻号頁・発行日
vol.75, no.2, pp.250-257, 2009-03-15
参考文献数
17
被引用文献数
2 3

等級の異なる10種のスケトウダラ冷凍すり身に加水して調製した加熱ゲルの破断強度(BS),破断凹み,及びゲル剛性(Gs)とタンパク質(P)濃度の関係を解析した。そして,(1)BSとGsはP濃度に伴って指数関数的に増大,(2)加水しない加熱ゲルのBSとGsの最大値はすり身の等級が上位の方が高く,(3)BS vs Gsを図示すると,10種のすり身から得た加熱ゲルの両値の間に強い正の相関があった。これらの結果は,そのBSとGsのレベルとP濃度依存性から見積る加熱ゲル形成能が,冷凍すり身の品質要因の一として有用であることを示す。From ten lots of walleye pollack frozen surimis of various grades, the heated gels of different protein concentrations were prepared by adding 0-150% water. Breaking strength (BS), breaking strain (bs), and gel stiffness (Gs=BS/bs) were measured, and the effect of the protein concentration of the heated gel on their physical values was analyzed. The results were as follows: (1) Of all the surimis tested, the BS and Gs of the heated gel increased exponentially with the increase in the protein concentration of the heated gel. (2) The maximum values of BS and Gs of the heated gels formed without addition of water were higher in the order of SA>FA>A>KA>2nd grades of frozen surimi. (3) When BS was plotted against Gs, there was a close, positive correlation among those of the heated gels from the ten lots of frozen surimis of various grades. These results indicated that the heated gel forming ability, as measured by BS and Gs levels of the heated gel and its dependence on the protein concentration, is a useful parameter for judging the quality of walleye pollack frozen surimi.
著者
小倉 芳子 松岡 達郎 川村 軍蔵 川村 軍蔵 Yoshiko Ogura Tatsuro Matsuoka Gunzo Kawamura 鹿児島大学大学院連合農学研究科 鹿児島大学水産学部 鹿児島大学水産学部 鹿児島大学水産学部 The United Graduate School of Agricultural Sciences Kagoshima University:(Permanent address) Faculty of Fisheries Bogor Agricultural University (IPB) Faculty of Fisheries Kagoshima University Faculty of Fisheries Kagoshima University Faculty of Fisheries Kagoshima University
出版者
The Japanese Society of Fisheries Science
雑誌
日本水産学会誌 = Bulletin of the Japanese Society of Scientific Fisheries (ISSN:00215392)
巻号頁・発行日
vol.65, no.6, pp.991-997, 1999-11-15
参考文献数
13
被引用文献数
2 2

触刺激に対するζポイント, ζ_tが網地に遭遇した魚の前進行動の継続に与える影響を調べるため, 失明させたコイ, ニジマス, ティラピア, ブルーギルを用いた水槽実験を行った。供試種では, 魚体の長さ方向での接触位置により前進後退行動が入れ替わり, ζ_tポイントの存在を確認できた。ζ_tポイントの位置は種固有で種間で異なる。網地に遭遇した魚の前進継続率は, 目合い, 縮結によって異なり, ζ_tポイントに基づく前進後退行動の分岐モデルに基づいて計算した前進継続確率でよく説明できた。刺網の漁獲過程で網地に遭遇した魚が網目に進入する確率は, ζ_tポイントの位置, 魚体の大きさと形状, 目合いと縮結に影響されると結論した。Two series of glass-tank experiments with blinded fish were conducted to investigate the existence of a ζ-point (a body section over which external stimulation alters forward and back ward motions of fish) against tactile stimulation and its effect in determining the direction of swimming upon contact with a net webbing. Cyprinus carpio, Salmo mykiss, Tilapia mossambica and Lepomis macrochirus were tested. Longitudinally random positions over the bodies of these fish were stimulated using thin sticks and they moved either forward or backward according to the location of the stimulated positions. Cyprinus carpio which encountered net webbing expanded in a tank proceeded into a mesh at different ratios under the conditions of three mesh sizes and three hang-in ratios. Geometrical analysis of contact of a netting twine and a fish body section indicated that the probability of proceeding into an encountered mesh increases with mesh size and is modally maximised at a certain hang-in ratio. It was concluded that, (1) a tactile ζ-point, ζ_t exists at a body section which is unique to each species, and (2) the probability for fish to proceed into a mesh of gillnet is affected by the position of ζ_t, body form and size, mesh size and hang-in ratio.
著者
YASUNORI ISHIBASHI HIDEAKI EKAWA HACHIRO HIRATA HIDEMI KUMAI
出版者
The Japanese Society of Fisheries Science
雑誌
Fisheries science (ISSN:09199268)
巻号頁・発行日
vol.68, no.6, pp.1374-1383, 2002 (Released:2009-03-31)
参考文献数
50
被引用文献数
33

Nile tilapia were exposed to severe hypoxic conditions. The respiratory frequency (RF) of the fish reached a maximum level at approximately 10 mmHg PO2 and decreased gradually thereafter. The fish sank to the bottom and subsequently their respiration began to stop. The hypoxic conditions increased the hematocrit value. As RF decreased, plasma cortisol and glucose levels climbed drastically. Just before respiratory arrest, the ATP and the total adenylate (TA) concentrations were significantly depressed in the liver, kidney and ordinary muscle but not in the heart or gill. As RF decreased, ATP and TA in both the liver and kidney decreased rapidly. Cytochrome oxidase activity increased significantly in the brain, heart, gill and ordinary muscle until respiratory frequency peaked. However, from the peak RF, this activity decreased in the liver and kidney. Lactic acid levels in both ordinary muscle and liver increased markedly when the fish sank. These results indicate that the stress response to hypoxic conditions is induced markedly with the decreased RF. It is also suggested that the decreased energy status in the liver and kidney of tilapia occurs at the same stage as the metabolic depression in the whole body, without increases in the aerobic and anaerobic metabolisms.
著者
CHOU CHIU-LONG PAON LISA ANN MOFFATT JOHN DANIEL ZWICKER BLAINE
出版者
The Japanese Society of Fisheries Science
雑誌
Fisheries science (ISSN:09199268)
巻号頁・発行日
vol.69, no.2, pp.369-378, 2003
被引用文献数
6

Bioaccumulation and distribution of Mn and Zn in the total soft tissues, digestive glands, residuals and adductor muscles of the horse mussel <i>Modiolus modiolus</i> from three sites, including industrialized and non-industrialized locations in Eastern Canada, were investigated. Extremely high digestive gland metal concentrations were found in individual mussels, as high as 1819 μg/g Mn wet weight and 1964 μg/g Zn wet weight, with mean values from 358 to 404 μg/g Mn and from 399 to 614 μg/g Zn for the collection sites. High Mn to Zn interrelationships were observed inall types of tissues and at all sites. Between different tissues, Zn was interrelated by linear relationships, and Mn was best described by power curve relationships for all tissue types. In the total soft tissue, Mn and Zn interrelations were fitted to power regression curves with different slopes between the three study sites. This indicated that horse mussel was exposed to different metal levels inthe environments and could be useful for monitoring these metals. The uptake of both metals at extremely high concentrations, the lack of regulation and the occurrence of interactions all suggest that Mn and Zn may play a biological role in horse mussels. Zn and Mn interactions, surprisingly, were not disrupted at the very high concentrations of either metal, which proves that the mechanism of metal interactions does not involve a detoxification role.
著者
柳本 卓 北村 徹 TAKASHI YANAGIMOTO TORU KITAMURA 北海道区水産研究所 日本エス・ユー・エス株式会社 Groundjish Biology Section Subarctic Fisheries Resources Division Hokkaido National Fisheries Research Institute Laboratory of Environmental Biology Japan NUS Co. Ltd.
出版者
The Japanese Society of Fisheries Science
雑誌
日本水産学会誌 = Bulletin of the Japanese Society of Scientific Fisheries (ISSN:00215392)
巻号頁・発行日
vol.68, no.6, pp.893-899, 2002-11-15
参考文献数
21
被引用文献数
7 3

タラ科3種(スケトウダラ,マダラ,コマイ)の成魚の筋肉から抽出した粗DNAを用いPCR法にて増幅したシトクロームb領域の塩基配列を決定した。塩基配列からDpnII,HaeIII, RsaIおよびTaqIの4種類の制限酵素により,タラ科3種の種判別ができることが明らかになった。また,種特異的なプライマーを設計して,増幅した断片の長さの違いで3種を識別する方法を確立した。これらの手法により,形態的な差異だけでは困難なタラ科仔稚魚の種判別が可能になった。Mitochondrial DNA sequences of the cytochrome b gene (1161bp) were obtained from three gadoid species (Theragra chalcogramma, Gadus macrocephalus, and Eleginus gracilis) near Hokkaido, Japan. Four restriction enzymes (DpnII, HaeIII, RsaI and TaqI) were diagnostic to identify these three species. Species specific internal primers were designed based upon the characteristic nucleotide substitutions in each species, which allowed discrimination among these three species by amplicon size.
著者
小倉 通男
出版者
The Japanese Society of Fisheries Science
雑誌
日本水産学会誌 (ISSN:00215392)
巻号頁・発行日
vol.34, no.7, pp.581-585, 1968

The mackerel small Tenbin angling (balance line angling) boats based on Katsuyama harbour in Chiba Prefecture are operating in Tokyo Bay through a whole year, changing season to season gear and kinds of fish to be caught as follows, mackerel pole and line fishing, squid angling miscellaneous angling (line fishing for sea bream, troll fishing for yellowtail, vertical long line for blue fishes and etc.).<br> In this study, whether the fishing ability of the boats will be fluctuated or not by the change of gear and fish were investigated on selected twenty boats operating over 100 days a year from the ones based on Katsuyama.<br> In three kinds of the fisheries, mackerel Tenbin angling, mackerel pole and line fishing and squid angling, the correspondent degree of good or worse catch in any combination of two kind of the fisheries was high, especially remarkable between the Tenbin angling and the pole and line fishing for mackerel, due to, perhaps, the reason that the fishermen well know the behaviour of the fish. In miscellaneous angling, however, such relation was not found.
著者
殖田 三郎
出版者
The Japanese Society of Fisheries Science
雑誌
日本水産学会誌 (ISSN:00215392)
巻号頁・発行日
vol.6, no.2, pp.91-104, 1937
被引用文献数
2

Already in 1929, I<sup>(18)</sup> reported preliminarily on this subject, but at that time both experi-ments and observations were. not satisfactory, so that I have continued this study since 1934 at the suggestion of Dr. K. M<sub>IYAKE</sub>.<br> As regards the fate of the carpospores, D<sub>ANGEARD</sub> <sup>(2)</sup> has reported that the carpospores of <i>Porphyra</i> germinate and develop to the protonema-like microscopic plantlets after they are liberated from the mother fronds.<br> After my observation, anyhow, I think it is not far from the truth to say that the car-pospores of <i>Porphyra tenera</i> K<sub>JELLM</sub>. germinate soon after the mother frond liberate them, because not only I could easily observe this germination with the fully riped carpospores in the laboratory, but also in nature on the twigs of dead trees or bamboos, which were planted in shallow waters for the culture of the alga, I could find out many germinated young plantlets in the later part of spring-that is the season, for the mother plants, to begin to decay. These plantlets do not grow large during the summer season, and they propagate with monospores repeatedly. The young fronds which germinate in autumn on the twigs of dead trees or bamboos yield monospores which are transformed from the ordinary vegetative cells; and thus multiplication of this alga is done. Thereafter, this plant develops normally, and gives rise to the frond of <i>Porphyra</i> in winter. These facts observed by myself in nature were quite certified also by the results of my experimental cultivations of the plantlets in the laboratory.
著者
原田 禎顕 Yoshiaki Harada 西日本フグ研究会 Nishinihon Society for the Study of Pufferfish Kazurugaoka
出版者
The Japanese Society of Fisheries Science
雑誌
日本水産学会誌 = Bulletin of the Japanese Society of Scientific Fisheries (ISSN:00215392)
巻号頁・発行日
vol.65, no.6, pp.1054-1061, 1999-11-15
参考文献数
10
被引用文献数
1 1

1994年から97年の間に福岡空港に輸入された中国産養殖フグを調べた。供試した70尾の, 外部形質, 骨学的諸形質を, 天然フグのそれと比較した。臀ひれの色調は, トラフグ及びナメラダマシと大差なかった。胸ひれ後方の大黒紋の後方に1ないし数個の黒斑が一部に認められたが, トラフグ様の不規則黒斑がなく, 額骨縦走隆起線の内湾が強くカラスにも似るが, 頭蓋骨のプロポーション, 腹椎骨数, 臀ひれの色調がカラスとは異なるので, ナメラダマシと同定された。Seventy specimens of the cultured pufferfish Takifugu pseudommus imported from China to Fukuoka Airport between 1994 to 1997 were studied. The external and osteological characters were examined. The colour of the anal fin of the specimens was almost the same as that of T. rubripes and T. pseudommus. Although no irregular black spots similar to T. rubripes were observed on the body in accord with T. pseudommus, in some specimens (ca. 26%), one or a few black spots behind the ocellated humeral blotch were observed in concordance with the specimen ((59) 1099) collected by the author of the scientific name. According to the key to members of genus Takifugu, the specimen is identified as T. pseudommus. On the other hand, judging from the external appearance of the cranium and the degree of incurvation of the longitudinal ridge of the frontal, the specimens seem to be both or either T. pseudommus and T. chinensis. But, because the colour of the anal fin, cranial proportion, and number of abdominal vertebrae (8) were different from those of T. chinensis, the specimen was concluded to be T. pseudommus. In addition, the theory that both T. pseudommus and T. chinensis belong to one and the same species was proved to be incorrect. Furthermore, the pufferfish which had been taken for"Nameradamasi"in recent times in Japan is different from T. pseudommus.