著者

川尻 稔

出版者

公益社団法人 日本水産学会

雑誌

日本水産学会誌 (ISSN:00215392)

巻号頁・発行日

vol.17, no.7, pp.206-210_2, 1952-03-25 (Released:2008-02-29)

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The catch of Tribolodon hakonensis has shown a great decrease recently in Chikuma River, middle Japan. From the fact that many young fishes have been caught by the “Ishizuka”, Nagano Prefectural Government prohibited this particular gear since 1946, however, there were heard varied opinions among fishermen as to its effect and, as the result, to remove the regulation. The “Ishizuka”, set up in early winter, is a mound composed of stones as, large as or larger thna humna head, measuring 50cm high and 100 to 150cm in diameter at bottom, the mound is built in the water 70 to 80cm deep with graduated slope toward the mainfolow of the river, also the entire “Ishizuka” is covered with straw-mat except the sloped part where the stones are flattened mixed with smaller gravels. In early spring, the mound is surrounded by bamboo-blinds and a trap is set against sloped part, then the stones are picked up piece by piece. The fish, mostly T. hakonensis, which conceal themselves in the space of stones during the winter, escape the mound and are easily trapped. Experimental “Ishizuka” numbering 17 were set in November 1948-'49, and the fish 4699 caught following spring were studied on age and length. The age determination by scale on these fish showed 59.5% of one year old, 19.8% of two, 16.6% of three and other older. It is thus apparent that the “Ishizuka” destroys tie younger generation of fish. 1 propose to regulate strictly the fishing by “Ishizuka” but rather utilize the mound for the protection of young by the hand of fishermen.

著者

吉田 優花 五十嵐 史子 高橋 希元 大迫 一史 永井 宏史

出版者

公益社団法人 日本水産学会

雑誌

日本水産学会誌 (ISSN:00215392)

巻号頁・発行日

pp.18-00039, (Released:2018-12-04)

参考文献数

16

被引用文献数

1

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新鮮なカミクラゲSpirocodon saltatrixは,独特な強い匂いを有することを見出した。その匂いはキュウリ様臭であった。そこで,このカミクラゲの有する特徴的なキュウリ様匂い物質について同定を試みた。GC/MS, GCを用いた官能試験,標品を用いた試験結果から,カミクラゲの有するキュウリ様臭物質は(E)-2-nonenalならびに(E,Z)-2,6-nonadienalと同定した。

著者

田中 邦三 田中 種雄 石田 修 大場 俊雄

出版者

公益社団法人 日本水産学会

雑誌

日本水産学会誌 (ISSN:00215392)

巻号頁・発行日

vol.52, no.9, pp.1525-1532, 1986-09-25 (Released:2008-02-29)

参考文献数

7

被引用文献数

10 13

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In the abalone habitat, the disturbed current is caused by the swell and eddy zones are made. The eddy zones acted to collect the swimming larvae. The authors studied the distribution chazacter of swimming and deposited larvae in the nursery ground. The research stations of eddy zones were stable distribution of swimming larvae in average number of 79 individuals per cubic meter of sea water. The density of shelled larvae deposited on the conglomerate in the reef, appeared less than the deposited shelled larvae in the downfall reef on the conglomerates. It was surmised that the swimming larvae were collected by some eddy current, and made abalone habitats. And we studied commonly that these depth were below 7m of open sea with rocky shore.

著者

長岡 千津子 山本 義和 江口 さやか 宮崎 信之

出版者

公益社団法人 日本水産学会

雑誌

日本水産学会誌 (ISSN:00215392)

巻号頁・発行日

vol.70, no.2, pp.159-167, 2004 (Released:2005-06-03)

参考文献数

21

被引用文献数

15 16

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2000年4月に大阪湾全域において表層泥を採取し, 重金属濃度 (Hg, Cd, Cu, Zn, Pb, Ni, Mn, Cr, Fe), および, 粒度組成 (泥・砂・礫), 強熱減量, COD, 硫化物について分析を行った。Mn以外の重金属元素は湾奥部や湾東部において濃度が高く, 海水の交換が良い明石海峡, 紀淡海峡付近で低い傾向を示した。底質重金属 (Mnを除く) 濃度と粒度組成, 強熱減量, 硫化物には強い相関性が認められたことから, 底泥の重金属濃度は重金属負荷量以外に, 粒度や有機物によっても大きく影響をうけることがわかった。

著者

大河内 裕之 北田 修一 岩本 明雄

出版者

公益社団法人 日本水産学会

雑誌

日本水産学会誌 (ISSN:00215392)

巻号頁・発行日

vol.64, no.3, pp.462-468, 1998 (Released:2008-02-29)

参考文献数

20

被引用文献数

2 1

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The authors consider a method to estimate the age composition of released fish which are recaptured and landed at fish markets, by use of the mean lengths and SDs of tagged fish, the ages of which are precisely known. Since 1988, brand tagged flounder have been released in Miyako Bay simultaneously with those without tags and these data are used to examine the practicality of the method. For the first step of the procedure, the total number of fish by age is estimated employing a normal length distribution by use of the mean lengths and SDs of tagged fish which are h and younger are groups, and then the number of fish by age is calculated for each length class. For the second step, the number of fish older than age h is estimated as the residual number of h and younger age for each length class. The difference between this method and conventional methods is that a normal distribution for the length frequency of fish older than the h age group is not assumed. The cumulative estimated length frequency of age groups fit well the original length frequency and this suggests the method is applicable.

著者

横山 拓也

出版者

公益社団法人 日本水産学会

雑誌

日本水産学会誌 (ISSN:00215392)

巻号頁・発行日

vol.87, no.1, pp.62-63, 2021-01-15 (Released:2021-01-28)

著者

小田 達也

出版者

公益社団法人 日本水産学会

雑誌

日本水産学会誌 (ISSN:00215392)

巻号頁・発行日

vol.78, no.3, pp.368-371, 2012 (Released:2012-06-15)

参考文献数

25

被引用文献数

1

著者

紫加田 知幸

出版者

公益社団法人 日本水産学会

雑誌

日本水産学会誌 (ISSN:00215392)

巻号頁・発行日

vol.84, no.4, pp.622-625, 2018-07-15 (Released:2018-08-31)

参考文献数

28

著者

立原 一憲 蛭子 亮制 塚島 康生

出版者

公益社団法人 日本水産学会

雑誌

日本水産学会誌 (ISSN:00215392)

巻号頁・発行日

vol.59, no.9, pp.1479-1488, 1993 (Released:2008-02-29)

参考文献数

15

被引用文献数

29 31

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The spawning, embryonic development, and morphological changes of the purplish amberjack Seriola dumerili were observed using specimens reared at the Aquaculture Research Laboratory of Nagasaki Prefectural Institute of Fisheries. Spawning was induced by intra-mascular injection of pituitary homogenate of the chum salmon Oncorhynchus keta and the genital hormone. Spawning occurred 36 hours after hormone treatment and 1, 400, 000 and 7, 000, 000 eggs were obtained in 1990 and 1991, respectively. The eggs were pelagic, spherical, and 1.05-1.20mm in diameter with a single oil globule of 0.22-0.28mm. The larvae hatched out 37 hours after spawning (W. T. 24.6°C). The newly hatched larvae were 2.7-3.1mm in length with 26 myotomes and a single oil globule. The yolk was mostly absorbed on the 4th day after hatching when the larvae attained 3.9mm in length and began to feed on rotifers. In the postlarval stage (6.3mm B. L.) the rudiments of ventral, dorsal, and anal fins began to develop and the vertebra was well ossified. In the juvenile stage (11.2mm B. L.) the membranous fins disappeared and fish gathered around drifting algae. Later in the juvenile stage (35.0mm B. L.) six or seven lateral bands appeared in the trunk as well as a band from the eye to the anterior part of the dorsal fin base. At a body length of 100mm, they reached the stage of young fish, while at a size of over 170mm in body length a yellow vertical stripe appeared from behind the operculum to the caudal peduncle. The smallest size of sexual maturation was thought to be about 600mm. Notochord or standard length at each growth stage was as follows: 2.7-3.9mm (yolk sac stage), 3.9-4.7mm (preflexion stage), 4.8-8.5mm (postflexion stage), 10-100mm (juvenile stage), 100-600mm (young stage), and over 600mm (adult stage).

著者

槌本 六良 宮田 克也 松尾 重己 大里 進子 高良 治江 三嶋 敏雄 橘 勝康

出版者

公益社団法人 日本水産学会

雑誌

日本水産学会誌 (ISSN:00215392)

巻号頁・発行日

vol.58, no.2, pp.301-306, 1992-02-25 (Released:2008-02-29)

参考文献数

10

被引用文献数

2 2

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As a part of a study on the improvement of flesh texture in cultured red sea bream, we examined whether body density was useful to estimate the body fat content in live fish. A significant negative correlation was seen between body fat content (BF) and body density (BD) for cultured red sea bream aged one and two years as shown below. BD=-0.0018BF+1.0997 (n=97; p<0.001) The deviation of body density from this regression line, the residual value for each fish, was effected by the muscle ratio in the whole body. These results indicate that body density is useful not only to estimate the body fat content but also to surmise the relative level of muscle ratio in live fish.

著者

杉浦 省三 高橋 克幸 小林 佳瑚

出版者

公益社団法人 日本水産学会

雑誌

日本水産学会誌 (ISSN:00215392)

巻号頁・発行日

vol.85, no.5, pp.503-505, 2019-09-15 (Released:2019-09-28)

参考文献数

13

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ウナギ代替フィレの開発を目的として,外来ナマズ2種(クララ,カイヤン)に肥育飼料を給餌して養殖した。これを,養殖業者から購入したニホンウナギとあわせて,化学分析と食味試験(蒲焼)によって比較・評価した。両種とも,肥育飼料を給餌することで,フィレの脂質含量が増加した。食味試験では,ウナギとクララの肉質(固さ)が同等の評価となった。「脂濃さ」では,カイヤンの腹肉がウナギよりも高い評点となった。一方「うなぎらしさ」で,クララが最も高い評点となった。

著者

武蔵 達也

出版者

公益社団法人 日本水産学会

雑誌

日本水産学会誌 (ISSN:00215392)

巻号頁・発行日

vol.72, no.3, pp.467-470, 2006 (Released:2006-06-07)

参考文献数

4

被引用文献数

4 4

著者

章 超樺 白井 隆明 鈴木 健 平野 敏行

出版者

公益社団法人 日本水産学会

雑誌

日本水産学会誌 (ISSN:00215392)

巻号頁・発行日

vol.58, no.5, pp.959-964, 1992-05-25 (Released:2008-02-29)

参考文献数

24

被引用文献数

3 4

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Lipoxygenase-like activity was found in the crude extracts from the skin and gill of wild and cultured ayu. After incubation of arachidonic acid with the crude extract from the wild and cultured ayu skins, the major oxygenated product was estimated to be 12-hydroxyeicosa-tetraenoic acid under high-performance liquid chromatography using a Waters μ bondapak fatty acid column. On the other hand, eicosapentaenoic acid yielded 12-hydroxyeicosapentaenoic acid. This enzyme activity of wild and cultured ayu was inhibited strongly in the presence of the following reagents: BHA, esculetin, p-chloromercuribenzoate, SnCl2, CuCl2. The C9 carbonyl compounds and alcohols specifically formed from the oxidation of poly-unsaturated fatty acids in the crude extract of wild ayu skin. In GC-MS chromatogram, a peak height of (E, Z)-2, 6-nonadienal formed from the wild ayu skin was higher than that of the cultured ayu skin, while that of 3, 6-nonadien-l-ol from the wild ayu skin was lower than that from the cultured fish skin.

著者

国土交通省総合政策局海洋政策課

出版者

公益社団法人 日本水産学会

雑誌

日本水産学会誌 (ISSN:00215392)

巻号頁・発行日

vol.73, no.6, pp.1150-1154, 2007 (Released:2007-11-26)

参考文献数

3

著者

西田 睦 澤志 泰正 西島 信昇 東 幹夫 藤本 治彦

出版者

日本水産學會

雑誌

日本水産学会誌 (ISSN:00215392)

巻号頁・発行日

vol.58, no.2, pp.199-206, 1992

被引用文献数

17 24

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The distribution and abundance of an endangered subspecies of the ayu <i>Plecoglossus altivelis ryukyuensis</i> was determined on the three major islands, Amami-oshima, Tokunoshima, and Okinawa Islands, in 1986. The fish was observed only in five streams in the southern part of Amami-oshima Island. Among these five streams, the majority of fish were found in the Yakugachi River. While the number of fish in this particular stream was approximately 3.5&times;10⁴, in all other streams the densities were much lower, and we therefore conclude that this subspecies is threatened and some attempts should be made for conservation of this fish.

著者

和田 洋藏 小林 知吉

出版者

公益社団法人 日本水産学会

雑誌

日本水産学会誌 (ISSN:00215392)

巻号頁・発行日

vol.61, no.2, pp.151-158, 1995-03-25 (Released:2008-02-29)

参考文献数

14

被引用文献数

7 12

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We reared the oval squid Sepioteuthis lessoniana in pens from June 3 to July 31 1992. The eggs spawned by these squid were reared in a tank to hatch. A female reared with a male in a pen spawned 11 times at intervals of 1-9 days from June 11 to July 30. This female laid 1, 540 egg capsules containing 7, 780 eggs in total (55 to 302 capsules containing 231 to 1, 388 eggs at one spawning). The hatchability of the eggs at each spawning ranged from 66.7 to 97.8%. Another female reared without a male in a pen spawned more than four times, but the hatchability rate of the eggs was lower than the former female. The female with a male had spermatophores when she died, while the female without a male had no spermatophores after several spawnings (both females had spermatophores at the beginning of the experiment). These results suggest that the oval squids copulated over the period from the previous spawning to the next. The number (Y) of eggs in one capsule was related to the water temperature (X, °C) on the day of spawning. This relation was expressed by the following equation. Y=15.1-0.426X.

著者

芳山 拓 坪井 潤一 松石 隆

出版者

公益社団法人 日本水産学会

雑誌

日本水産学会誌 (ISSN:00215392)

巻号頁・発行日

vol.84, no.5, pp.858-871, 2018-09-15 (Released:2018-10-19)

参考文献数

23

被引用文献数

4 5

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適切な管理の下での希少魚を対象とした遊漁は,遊漁者の消費を通じて希少魚を保全する社会的・経済的根拠を強める。本研究では,北海道然別湖におけるミヤベイワナ遊漁と,朱鞠内湖におけるイトウ遊漁において,遊漁者の消費実態を明らかにした。どちらの湖ともに,全国各地から遊漁者が訪れていた。遊漁者がそれぞれの湖で釣りをするために消費した金額は,然別湖では年間3,328万円,朱鞠内湖では4,156万円と推定された。このうち,交通費以外はほぼすべて遊漁料や宿泊滞在費として釣り場近隣地域で消費されたと考えられた。

著者

佐藤 健

出版者

公益社団法人 日本水産学会

雑誌

日本水産学会誌 (ISSN:00215392)

巻号頁・発行日

vol.16, no.1, pp.19-20, 1950-05-25 (Released:2008-02-29)

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The temperature and time needed for the killing of fly eggs were desceribed in report 1. The following result of experiments shows that old maggots are more resistant for hesting than younger ones or eggs.

著者

樋口 恵太 永井 清仁 服部 文弘 前山 薫 瀬川 進 本城 凡夫

出版者

公益社団法人 日本水産学会

雑誌

日本水産学会誌 (ISSN:00215392)

巻号頁・発行日

vol.82, no.4, pp.608-618, 2016 (Released:2016-08-25)

参考文献数

56

被引用文献数

2 2

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真珠収穫後のアコヤガイ貝肉を主原料とし,海事作業から発生する貝掃除屑を加えてコンポスト化試験を行った。その結果,アコヤガイ貝肉は約 45 日の処理でコンポスト化が可能である事が分かった。また,貝掃除屑はコンポスト材料の通気性向上や,コンポストの肥料成分を増加させる効果が認められた。完熟したコンポストは,塩分を含むが,コマツナに対して肥料効果を示した。以上より,真珠養殖過程で廃棄される貝肉および貝掃除屑は,農業資材として有効活用できる事が示され,真珠養殖による環境負荷の低減につながると期待された。

出版者

公益社団法人 日本水産学会

雑誌

日本水産学会誌 (ISSN:00215392)

巻号頁・発行日

vol.87, no.2, pp.181-182, 2021-03-15 (Released:2021-03-10)