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- departmental bulletin paper
departmental bulletin paper
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Journal of National Fisheries University Volume 62 Issue 3
pp. 109 - 116
published_at 2014-03
Creators :
Doi Hiroyuki
Sonoyama Takayuki
Imai Chifumi
Sakai Harumi
Ishibashi Toshiaki
Publishers : National Fisheries University
Journal of National Fisheries University Volume 62 Issue 2
pp. 85 - 86
published_at 2014-03
Creators :
Kondo Masakazu
Yasumoto Shinya
Takahashi Yukinori
Publishers : National Fisheries University
Journal of National Fisheries University Volume 62 Issue 2
pp. 87 - 89
published_at 2014-03
Creators :
Doi Hiroyuki
Honma Yoshiharu
Sonoyama Takayuki
Ishibashi Toshiaki
Miyazawa Masayuki
Yoneyama Yoichi
Sakai Harumi
Publishers : National Fisheries University
Journal of National Fisheries University Volume 62 Issue 2
pp. 63 - 68
published_at 2014-03
Creators :
Sakai Harumi
Nakai Hiroki
Amano Shota
Suda Yusuke
Publishers : National Fisheries University
Journal of National Fisheries University Volume 62 Issue 1
pp. 13 - 18
published_at 2013-09
Journal of National Fisheries University Volume 63 Issue 4
pp. 262 - 270
published_at 2015-03
Creators :
Kondo Masakazu
Sakai Maho
Yasumoto Shinya
Takahashi Yukinori
Publishers : National Fisheries University
Journal of National Fisheries University Volume 63 Issue 4
pp. 244 - 248
published_at 2015-03
Creators :
Abe Mahiko
Murase Noboru
Hatama Toshihiro
Shikano Yosuke
Kanai Taisei
Publishers : National Fisheries University
Journal of National Fisheries University Volume 63 Issue 3
pp. 219 - 231
published_at 2015-03
Journal of National Fisheries University Volume 63 Issue 3
pp. 181 - 188
published_at 2015-03
Journal of National Fisheries University Volume 63 Issue 2
pp. 127 - 143
published_at 2015-02
Creators :
Doi Hiroyuki
Kushimoto Teppei
Sonoyama Takayuki
Ishibashi Toshiaki
Nishikawa Masato
Sakai Harumi
Publishers : National Fisheries University
Journal of National Fisheries University Volume 63 Issue 2
pp. 97 - 109
published_at 2015-02
Creators :
Tanoue Hideaki
Mohri Masahiko
Tatewaki Hideaki
Kajikawa Yoritake
Satoh Shun
Nakamura Takeshi
Kawasaki Jyunji
Ruitton Sandrine
Mizuguchi Chizuo
Hamano Akira
Yoshimura Kazumasa
Publishers : National Fisheries University
水産大学校研究報告 Volume 23 Issue 2
pp. 47 - 65
published_at 1974-12
Journal of National Fisheries University Volume 60 Issue 2
pp. 123 - 127
published_at 2012-01
水産大学校研究報告 Volume 22 Issue 3
pp. 177 - 198
published_at 1974-03
水産大学校研究報告 Volume 25 Issue 1
pp. 67 - 74
published_at 1976-10
水産大学校研究報告 Volume 22 Issue 3
pp. 147 - 165
published_at 1974-03
Journal of National Fisheries University Volume 62 Issue 3
pp. 91 - 97
published_at 2014-03
Creators :
Imai Chifumi
Michine Atsushi
Murayama Tatsurou
Publishers : National Fisheries University
水産大学校研究報告 Volume 22 Issue 3
pp. 207 - 216
published_at 1974-03
Journal of National Fisheries University Volume 16 Issue 2
pp. 81 - 93
published_at 1968-03
Journal of National Fisheries University Volume 18 Issue 1
pp. 36 - 44
published_at 1969-08
Journal of National Fisheries University Volume 62 Issue 4
pp. 159 - 162
published_at 2014-03
Creators :
Fukushima Hideto
Yaguchi Shigenori
Maeda Toshimichi
Fukuda Yutaka
Publishers : National Fisheries University
水産大学校研究報告 Volume 52 Issue 1
pp. 1 - 9
published_at 2004-01
Journal of National Fisheries University Volume 62 Issue 3
pp. 99 - 107
published_at 2014-03
Creators :
Nakamura Takafumi
Nakamura Makoto
Ohta Hiromitsu
Maeda Toshimichi
Aketagawa Masako
Morimoto Eiji
Publishers : National Fisheries University
Journal of National Fisheries University Volume 10 Issue 2
pp. 119 - 353
published_at 1961-02
Journal of National Fisheries University Volume 17 Issue 1
pp. 25 - 34
published_at 1968-10
Journal of National Fisheries University Volume 9 Issue 2
pp. 89 - 308
published_at 1960-02
Journal of National Fisheries University Volume 6 Issue 1
pp. 91 - 96
published_at 1956-11
Creators :
Chigusa Masanori
Kataoka Akiyoshi
Hirose Makoto
Publishers : National Fisheries University
Journal of National Fisheries University Volume 6 Issue 1
pp. 123 - 139
published_at 1956-11
Journal of National Fisheries University Volume 6 Issue 1
pp. 115 - 122
published_at 1956-11
Journal of National Fisheries University Volume 6 Issue 3
pp. 315 - 317
published_at 1957-07
Journal of National Fisheries University Volume 6 Issue 3
pp. 319 - 321
published_at 1957-07
Journal of National Fisheries University Volume 5 Issue 2
pp. 113 - 115
published_at 1955-12
Journal of National Fisheries University Volume 5 Issue 2
pp. 137 - 158
published_at 1955-12
Journal of National Fisheries University Volume 21 Issue 1
pp. 81 - 151
published_at 1972-09
Journal of National Fisheries University Volume 71 Issue 1
pp. 11 - 20
published_at 2022-12
To improve breeding techniques for aquarium freshwater pufferfishes, hormone injection (hCG, 10 IU per g)-induced maturity and insemination of Auriglobus modestus from Thailand were undertaken, and morphological development of eggs and early stage larvae observed. Artificial insemination was performed two to five days after hormone injection. Although no fertilized eggs resulted from artificial insemination utilizing a wet (freshwater) method, an isotonic (sodium lactate ringer solution) method produced 458 fertilized eggs out of 787 eggs (fertilization rate 61.7%) spawned by one female, although only 8 larvae (1.7%) eventually hatched. Eggs were oval [long axis 2.05 ± 0.06 mm, short axis 1.68 ± 0.06 mm (n = 5)], translucent, demersal, and adhesive, and contained a number of small yellow oil globules. Oval eggs are unusual among pufferfishes, although common in the genus Chonerinos, an indication of the genetic closeness of the latter and Auriglobus, but also suggesting ecological similarity. The eggs hatched after 2 days, larvae one day after hatching [4.54 ± 0.34 mm NL (n = 9)] having a large yolk sac. However, the mouth remained unopened, the optic vesicle uncolored, and the pectoral fin membrane undeveloped, except for small knob-like rudiments. Seven days after hatching, larvae [5.22 ± 0.10 mm NL (n = 3)] had lost the yolk sac and acquired rudimentary soft rays in the pectoral, dorsal and anal fins. All larvae died after eight days. DNA barcoding comparisons (COI gene, 652 bp) of several pufferfish genera indicated a close genetic relationship of Auriglobus and Chonerhinos, being nested in the same clade.
Creators :
Momota Kazuyuki
Doi Hiroyuki
Hashiguchi Yasuyuki
Sakai Harumi
Murakami Shoki
Obata Hiroshi
Publishers : National Fisheries University
Journal of National Fisheries University Volume 71 Issue 1
pp. 21 - 25
published_at 2022-12
An unusual instance of biting behavior by the pufferfish Arothron meleagris, possibly related to spawning behavior was observed during low tide of new moon spring tide while scuba-diving off the Maldives Islands. Multiple males were following, biting and clinging persistently to a female. Subsequent internet searches revealed that similar biting behavior was common among several congeners, possibly being a characteristic spawning-related behavior of the genus.
Creators :
Doi Hiroyuki
Maei Kaori
Yoshitake Takafumi
Momota Kazuyuki
Sakai Harumi
Publishers : National Fisheries University
Journal of National Fisheries University Volume 71 Issue 2
pp. 35 - 42
published_at 2023-01
We investigated the hemolymph oxygen and acid–base status of akoya pearl oysters, Pinctada fucata martensii, exposed to air for a short time (4 h) to elucidate the acid–base balance and CO_2 dynamics. The hemolymph O_2 partial pressure (Po_2) in air-exposed akoya pearl oysters decreased from 88.7 torr (mean value) to 29.4 torr at 1 h, and the low Po_2 continued for the next 3 h during air exposure. The hemolymph pH decreased from 7.586 to 7.082 during air exposure for 1 h and reached 6.851 at 4 h. The hemolymph CO_2 partial pressure increased from 0.9 torr to 4.4 torr at 1 h and reached 7.3 torr after 4 h of air exposure. The hemolymph bicarbonate concentration and calcium ion concentration at 0 h (control) were 1.9 mM/L and 9.0 mM/L, respectively, and these properties did not significantly change during air exposure. From these results, it was determined that the akoya pearl oysters had hypoxemia caused by hypoventilation at an early phase of the short-term air exposure. The akoya pearl oysters inhibited the discharge of CO_2 by hypoventilation, and respiratory acidosis was caused due to the excessive accumulation of CO_2. Bicarbonate was not mobilized from the shell valve into the hemolymph during the short-term air exposure.
Journal of National Fisheries University Volume 4 Issue 1
pp. 1 - 20
published_at 1955-02
Journal of National Fisheries University Volume 71 Issue 2
pp. 57 - 65
published_at 2023-01
In aquaculture and fixed-net fishing, fishing nets need to be fixed in the water for a long period of time. Therefore, attached organisms such as shellfish, algae, and parasite eggs easily stick to the nets, making periodic cleaning indispensable. A common method is for divers to dive into the water and clean the nets directly with their hands. However, this method is dangerous because it can be fatal to divers due to high water pressure and low water temperature. Therefore, this study considered the possibility of using underwater robot to clean fishery nets in place of divers to avoid these dangers. A mobile mechanism that can move freely along the sides of fixed fishery net in the water has already been developed in this laboratory. In this study, we propose the cleaning system using autonomous robots that automatically cleans aquaculture nets underwater and the charging station using coils for wireless power supply. This robot and a charging station will be installed on the aquaculture nets, and the robot will be driven periodically to clean the nets underwater with less labor and in a safe manner.
Journal of National Fisheries University Volume 71 Issue 3
pp. 73 - 80
published_at 2023-03
Viral edema of carp (VEC) caused by the carp edema virus (CEV) causes economic losses for Japanese koi farms. In this study, we investigated the infectivity and pathogenicity of a domestic CEV isolate (genogroup IIa) in koi carp, common carp and goldfish. The challenge test consisted of 9 groups (n = 15):3 groups each of koi carp, common carp, and goldfish, at 15, 20 and 25℃. These groups were challenged with CEV (3.0×10^3 copies/µL) in duplicate. All koi carp died in the 15 and 20℃ groups, but all survived in the 25℃ group. The surviving koi carp in 25℃ groups showed high PCR positive rates of 66.7 and 73.3%, with VEC histopathological changes observed. For the common carp, 1 and 2 fish died in the 20℃ groups, but no deaths or VEC symptoms were observed in the 15 and 25℃ groups. In all common carp groups, PCR-positive fish were observed along with histopathological changes. For all goldfish groups, no deaths or VEC symptoms were observed. As with the common carp, PCR-positive fish were found in all goldfish groups, yet no VEC histopathological changes were detected. These results demonstrate infectivity of this CEV strain in koi carp, common carp, and goldfish, but low pathogenicity in common carp and goldfish.
Creators :
Matsumoto Akane
Honda Kotaro
Takahashi Hiroshi
Kondo Masakazu
Yasumoto Shinya
Publishers : National Fisheries University
Journal of National Fisheries University Volume 71 Issue 4
pp. 141 - 151
published_at 2023-03
Growth of immature Lates japonicus in eelgrass (Zostera japonica) beds of the Tomouchi River located at around 4.3 km upstream from the river mouth of the Gokase River, Kyushu Island, Japan was studied by the mark and recapture method and scale reading from September 1998 to March 2004. Newly occurring 0-year-old L. japonicus specimens of 13.9–78.0 mm SL (standard length) in Z. japonica beds of the Tomouchi River in August or September reached sizes ranging 58.8–125.7 mm SL by April and 203.4–232.8 mm SL between October and November of the following year. Monthly changes in specific growth rates of individuals demonstrated that rapid growth months of immature fish were limited to the period of high water temperature (22–28℃) from June to October. Also, it was supposed that the large-sized fish of the 0-year-old fish migrated away from Z. japonica beds after December, however a few fish remained in Z. japonica beds until the following November.
Creators :
Takeshita Naohiko
Kondou Takuya
Nagata Shingo
Takahashi Hiroshi
Publishers : National Fisheries University
Journal of National Fisheries University Volume 4 Issue 2
pp. 173 - 178
published_at 1955-03
Journal of National Fisheries University Volume 20 Issue 3
pp. 213 - 233
published_at 1972-03
Journal of National Fisheries University Volume 21 Issue 2
pp. 221 - 227
published_at 1972-12
Journal of National Fisheries University Volume 33 Issue 2.3
pp. 185 - 192
published_at 1984-12
Journal of National Fisheries University Volume 61 Issue 4
pp. 234 - 241
published_at 2013-03
Creators :
Kondo Masakazu
Yasumoto Shinya
Takahashi Yukinori
Publishers : National Fisheries University
Journal of National Fisheries University Volume 18 Issue 1
pp. 18 - 25
published_at 1969-08
Journal of National Fisheries University Volume 4 Issue 2
pp. 217 - 223
published_at 1955-03
Journal of National Fisheries University Volume 4 Issue 2
pp. 211 - 216
published_at 1955-03
Journal of National Fisheries University Volume 4 Issue 2
pp. 253 - 270
published_at 1955-03
Journal of National Fisheries University Volume 70 Issue 4
pp. 125 - 148
published_at 2022-03
Two types of stratified [two-layer; inner layer (L0) and outer layer (L1)] granules were observed in the neutrophils (neutrophil granule, NG: type 1, NG1a; type 2, NG2) of larva (ammocoetes) of far eastern brook lamprey Lethenteron reissneri collected in a tributary of the Koyagawa River in Yamaguchi Prefecture. The NG1a consisted of chromophobic L0 and chromatophilic L1. On the other hand, the NG2 had chromatophilic L0 and chromophobic L1. The L1 of NG1a and L0 of NG2 showed a variety of colors [eosinophilic or basophilic (orthomethylenophilic or metaazurophilic)] depending on the staining conditions. These layers were positive for alkaline phosphatase, α-naphtyl acetate esterase and Sudan black B. Some enzymes, such as acid phosphatase, ꞵ-glucuronidase, and naphthol AS-D chloroacetate esterase were detected in the L0 of NG2. The neutrophils lacked α-naphtyl butyrate esterase and peroxidase.
Journal of National Fisheries University Volume 70 Issue 4
pp. 165 - 173
published_at 2022-03
Mentaiko, a seasoned cod roe, is one of the main food products in produced from the ovary of Walleye Pollock in Japan. Walleye Pollock roe is predominantly used in the preparation of Mentaiko, with limited other applications. This study showed the processing procedure for an edible film from the Walleye Pollock roe. A few conditions were identified wherein the film could be prepared during processing of the roe. In the first step, water-soluble proteins were extracted from roe samples employing a pH 12.0 phosphate buffer. The pH of this mixture was subsequently adjusted to pH 6.0, mixed with 1.0% transglutaminase and heated at 70℃ for 20 min. Finally, the product was dried in silicon cases suitable for the preparation of edible films. Evaluation of the dried film indicated some improvement in terms of flexibility compared to similarly produced films. During the evaluation of various film-forming solutions, an increase in the amount of surface hydrophobic groups and/or surface sulfhydryl groups was associated with an increased film production. We showed that the edible film can be produced from the proteins of Walleye Pollock roe.
Creators :
Yaguchi Shigenori
Fujinaka Megumi
Yoshida Haruka
Yamazaki Ryoutarou
Ohkubo Makoto
Maeda Toshimichi
Publishers : National Fisheries University
Journal of National Fisheries University Volume 70 Issue 4
pp. 175 - 184
published_at 2022-03
This study examines the roll of Ube municipality to build collaboration with sales businesses in local fishery sector. Ube city adopted “Evidence-Based Policy Making” to make the next fisheries promotion plan. They conducted questionnaire survey to the local fishery sector and customers and made the first draft of the promotion plan according to the result. Members of the committee were also the local fishermen, distributers and representative from the tourist industry and they discussed and understood the present situation and problem of the community and became awareness of the necessity of their new action. Thus they could take the first step to build a cooperative business relationship among local fishery sector.
Journal of National Fisheries University Volume 70 Issue 4
pp. 185 - 198
published_at 2022-03
In the United States, the Korean War (1950–1953) has long been known as the “forgotten war.” However, the war was a watershed for racial minorities in the U.S. military. The U.S. racial policy was changed drastically after U.S. president Harry S. Truman signed Executive Order 9981 in 1948. This study analyzes the military service of Japanese American Nisei (the second generation) who served in the Korean War. The goal of this study is to clarify the transitions of social status of Nisei before and after their service. The paper highlights the Nisei’s motivation to serve in the military, using semi-structured interviews of Californian veterans that I conducted from 2008 to 2019. Most were Nisei and had U.S. citizenship as their birthright. However, their citizen status was insecure even in the fifties, and racial discrimination prevented them from obtaining adequate employment or college education. The Korean War GI Bill benefits definitely supported them after they returned from the battlefield. In this sense, military service in the Korean War became a pathway to success in the post-internment era for Nisei, yet it also revealed their unstable social status. This paper categorizes their motivations to serve from three elements : socioeconomic reasons, honor and dignity as U.S. soldiers, and their loyalty and patriotism for the United States. The multiple voices of my interviewees shows that while their difficult situations were certainly critical elements among their motivations for service, their various experiences still should not be considered as simply monolithic.
Journal of National Fisheries University Volume 1 Issue 1
pp. 1 - 5
published_at 1949-12
Journal of National Fisheries University Volume 1 Issue 1
pp. 91 - 108
published_at 1949-12
Journal of National Fisheries University Volume 56 Issue 4
pp. 349 - 354
published_at 2008-03
Creators :
Kajitori Kazuaki
Urikura Shigeru
Aoki Kunimasa
Publishers : National Fisheries University
Journal of National Fisheries University Volume 1 Issue 1
pp. 57 - 63
published_at 1949-12
Journal of National Fisheries University Volume 1 Issue 1
pp. 65 - 89
published_at 1949-12
Journal of National Fisheries University Volume 2 Issue 1
pp. 35 - 39
published_at 1952-07
Journal of National Fisheries University Volume 2 Issue 1
pp. 54 - 57
published_at 1952-07
Creators :
Fujii Minoru
Tomida Teruo
Hirotaka Koji
Era Shitoku
Publishers : National Fisheries University
Journal of National Fisheries University Volume 2 Issue 2
pp. 1 - 247
published_at 1952-12
Journal of National Fisheries University Volume 3 Issue 2
pp. 167 - 180
published_at 1953-11
Journal of National Fisheries University Volume 3 Issue 2
pp. 157 - 166
published_at 1953-11
Journal of National Fisheries University Volume 3 Issue 2
pp. 117 - 122
published_at 1953-11
Journal of National Fisheries University Volume 3 Issue 2
pp. 107 - 109
published_at 1953-11
Journal of National Fisheries University Volume 3 Issue 2
pp. 151 - 156
published_at 1953-11
Journal of National Fisheries University Volume 3 Issue 2
pp. 111 - 116
published_at 1953-11
Journal of National Fisheries University Volume 3 Issue 2
pp. 123 - 131
published_at 1953-11
Journal of National Fisheries University Volume 3 Issue 2
pp. 193 - 196
published_at 1953-11
Journal of National Fisheries University Volume 3 Issue 2
pp. 197 - 200
published_at 1953-11
Journal of National Fisheries University Volume 3 Issue 3
pp. 255 - 273
published_at 1954-03
Creators :
Takai Toru
Yoshioka Toshio
Maekawa Kanesuke
Yatsuyanagi Kenro
Publishers : National Fisheries University
Journal of National Fisheries University Volume 3 Issue 3
pp. 217 - 228
published_at 1954-03
Journal of National Fisheries University Volume 3 Issue 3
pp. 235 - 238
published_at 1954-03
Journal of National Fisheries University Volume 3 Issue 3
pp. 239 - 245
published_at 1954-03
Journal of National Fisheries University Volume 3 Issue 3
pp. 247 - 253
published_at 1954-03
Journal of National Fisheries University Volume 3 Issue 3
pp. 289 - 294
published_at 1954-03
Journal of National Fisheries University Volume 3 Issue 3
pp. 283 - 287
published_at 1954-03
Journal of National Fisheries University Volume 4 Issue 2
pp. 117 - 131
published_at 1955-03
Journal of National Fisheries University Volume 4 Issue 2
pp. 167 - 172
published_at 1955-03
Journal of National Fisheries University Volume 4 Issue 2
pp. 149 - 158
published_at 1955-03
Journal of National Fisheries University Volume 4 Issue 2
pp. 179 - 181
published_at 1955-03
水産大学校研究報告 Volume 30 Issue 1
pp. 1 - 11
published_at 1981-11
Journal of National Fisheries University Volume 4 Issue 2
pp. 245 - 251
published_at 1955-03
Journal of National Fisheries University Volume 4 Issue 2
pp. 239 - 244
published_at 1955-03
Journal of National Fisheries University Volume 4 Issue 2
pp. 225 - 230
published_at 1955-03
Journal of National Fisheries University Volume 62 Issue 1
pp. 39 - 45
published_at 2013-09
Journal of National Fisheries University Volume 56 Issue 1
pp. 99 - 105
published_at 2007-11
Creators :
Harada Kazuki
Maeda Toshimichi
Honda Masato
Kawahara Tsuyoshi
Tamaru Miki
Shiba Tsuneo
Publishers : National Fisheries University
水産大学校研究報告 Volume 22 Issue 2
pp. 49 - 53
published_at 1973-12
水産大学校研究報告 Volume 22 Issue 3
pp. 199 - 206
published_at 1974-03
Journal of National Fisheries University Volume 5 Issue 2
pp. 103 - 106
published_at 1955-12
Journal of National Fisheries University Volume 5 Issue 1
pp. 1 - 87
published_at 1955-09
Journal of National Fisheries University Volume 5 Issue 2
pp. 89 - 102
published_at 1955-12
Creators :
Satow Takerow
Journal of National Fisheries University Volume 58 Issue 1
pp. 65 - 71
published_at 2009-11
水産大学校研究報告 Volume 26 Issue 1
pp. 1 - 34
published_at 1977-08
水産大学校研究報告 Volume 24 Issue 3
pp. 305 - 320
published_at 1976-03
Journal of National Fisheries University Volume 1 Issue 1
pp. 51 - 55
published_at 1949-12
Journal of National Fisheries University Volume 5 Issue 2
pp. 107 - 111
published_at 1955-12
Journal of National Fisheries University Volume 6 Issue 1
pp. 97 - 100
published_at 1956-11
Journal of National Fisheries University Volume 6 Issue 1
pp. 101 - 108
published_at 1956-11