Researcher Database
| Yoshihiko Kamei |
| School of Fisheries Sciences Training Ship “Oshoro-maru” |
| Associate Professor |
Last Updated :2024/05/09
Researcher Profile and Settings
Affiliation
Job Title
J-Global ID
Research Interests
Research Areas
Educational Organization
- Bachelor's degree program School of Fisheries Sciences
Research Activities
Published Papers
- Yusaku Shimizu, Atsushi Ooki, Hiroji Onishi, Tetsuya Takatsu, Seiji Tanaka, Yuta Inagaki, Kota Suzuki, Naoto Kobayashi, Yoshihiko Kamei, Kenshi KumaJOURNAL OF ATMOSPHERIC CHEMISTRY 74 (2) 205 - 225 0167-7764 2017/06 [Refereed][Not invited]
Volatile organic iodine compounds (VOIs) emitted from the ocean surface to the air play an important role in atmospheric chemistry. Shipboard observations were conducted in Funka Bay, Hokkaido, Japan, bimonthly or monthly from March 2012 to December 2014, to elucidate the seasonal variations of VOI concentrations in seawater and their sea-to-air iodine fluxes. The bay water exchanges with the open ocean water of the North Pacific twice a year (early spring and autumn). Vertical profiles of CH2I2, CH2ClI, CH3I, and C2H5I concentrations in the bay water were measured bimonthly or monthly within an identified water mass. The VOI concentrations began to increase after early April at the end of the diatom spring bloom, and represented substantial peaks in June or July. The temporal variation of the C2H5I profile, which showed a distinct peak in the bottom layer from April to July, was similar to the PO4 (3-) variation profile. Correlation between C2H5I and PO4 (3-) concentrations (r = 0.93) suggests that C2H5I production was associated with degradation of organic matter deposited on the bottom after the spring bloom. CH2I2 and CH2ClI concentrations increased substantially in the surface and subsurface layers (0-60 m) in June or July resulted in a clear seasonal variation of the sea-to-air iodine flux of the VOIs (high in summer or autumn and low in spring). - Nanako Hioki, Kenshi Kuma, Yuichiroh Morita, Daichi Miura, Atsushi Ooki, Seiji Tanaka, Hiroji Onishi, Tetsuya Takatsu, Naoto Kobayashi, Yoshihiko KameiJOURNAL OF OCEANOGRAPHY 71 (6) 703 - 714 0916-8370 2015/12 [Refereed][Not invited]
We studied iron remobilization and nutrient regeneration in bottom water of Funka Bay, Japan, bimonthly from August 2010 to December 2011. The bay basin (bottom depth, 92-96 m) is separated from the northwest Pacific Ocean at its mouth by a sill with a depth of 60 m. After a spring phytoplankton bloom during early March-early April, nutrients in bay bottom water tended to accumulate with time until August-September, and to increase gradually with depth during April-October, by the oxidative decomposition of settling particulate organic matter on the bay bottom. In contrast, the process of iron remobilization into bottom water of the bay is remarkably different from nutrient regeneration. The much higher concentrations of dissolved and total dissolvable iron near the bottom and the seasonally variable relationship between dissolved iron concentration and apparent oxygen utilization in bay bottom water likely reflect a balance between dissolved iron input and removal processes within the bay bottom water. The release of soluble Fe(II) from reducing bay sediments might induce the high concentrations of dissolved and total dissolvable iron in deep-bottom waters of Funka Bay and might be one of the most important sources of iron in Funka Bay. The upward transport of iron from the bay bottom to the surface water during the winter vertical mixing may play an important role in the supply of bioavailable iron for phytoplankton growth in the coastal waters. - Yuta Inagaki, Tetsuya Takatsu, Takao Uenoyama, Noriko Yoneda, Shinichi Yokoyama, Yoshihiko Kamei, Naoto Kobayashi, Toyomi TakahashiFISHERIES SCIENCE 81 (4) 687 - 698 0919-9268 2015/07 [Refereed][Not invited]
To clarify effects of hypoxia on feeding and somatic condition of blackfin flounder Glyptocephalus stelleri, we studied the temporal relationship between hypoxia and feeding intensity as well as the condition of this species in May and August 2006-2012. Hypoxia occurred near the seafloor in August between 2010 and 2012 but not in May. Population densities of gammarid amphipods Ampelisca brevicornis and Melita sp., the main prey items of blackfin flounder, were consistently low; however, the somatic condition and feeding intensity of blackfin flounder increased during hypoxia. Such an increase was not detected in May 2012 under non-hypoxic conditions. These facts imply that the hypoxia increased prey availability for blackfin flounder through the increased exposure of the gammarids over the sea floor, and, thus, resulted in improved body condition in August 2011 and 2012. Hypoxia positively would influence the somatic condition and feeding intensity of blackfin flounder in Funka Bay in August 2011 and 2012; however, the somatic condition during this period did not reach the levels recorded in 1983, suggesting that habitat quality for blackfin flounder in Funka Bay in 2011 and 2012 was worse than that in 1983. - Dharmamony Vijai, Mitsuo Sakai, Yoshihiko Kamei, Yasunori SakuraiSCIENTIA MARINA 78 (4) 511 - 519 0214-8358 2014/12The neon flying squid, Ommastrephes bartramii, is an oceanic squid species that is widely distributed in the North Pacific, with the winter-spring cohort spawning around the Hawaiian Islands. Here, we investigated the spawning characteristics of O. bartramii by analyzing various reproductive parameters of individuals (622 males, 108 females) collected in this region. Female spawning status was determined from the somatic indices and histological characteristics of the ovaries. At all developmental stages, the ovaries of spawned females contained oocytes, and oviduct fullness was not correlated with body size. Thus, because the eggs mature asynchronously, with multiple filling and evacuation events, this species is considered an intermittent spawner. Mature males with developed accessory glands were also present within the distribution range of healthy spawned females, indicating that mating occurs between spawning events. Our data indicate that the first spawning event occurs at a mantle length of similar to 520-540 mm for Hawaiian O. bartramii. Subsequently, the squid forage and grow, and refill the oviducts, before the second spawning event occurs.
- Yuta Inagaki, Tetsuya Takatsu, Masafumi Kimura, Yota Kano, Toyomi Takahashi, Yoshihiko Kamei, Naoto Kobayashi, Tatsuaki MaedaFISHERIES SCIENCE 80 (4) 725 - 734 0919-9268 2014/07 [Refereed][Not invited]
To identify the factors that influence the growth rate of flathead flounder Hippoglossoides dubius in Funka Bay, Japan, we studied temporal changes in the growth of this species and its prey from 1989 to 2012. The lowest growth rate of H. dubius was recorded in the 1995 year-class, which had experienced severe hypoxia between 1995 and 1997. However, the highest growth rate was recorded in the 2007 year-class, which had experienced hypoxia between 2009 and 2011. In 2000 and 2001, small-sized flounder (< 200 mm TL) from the 1995 year-class were feeding on mysidaceans, whereas those from other year-classes fed on small Ophiura spp. (< 9 mm in disc diameter) in 2009, 2011, and 2012. Small Ophiura spp. were more abundant in 2007 and 2011 than in 2002 and 2003. Successful recruitment of Ophiura spp. took place between 2007 and 2011 and cohorts from these years could tolerate hypoxia. This suggests that food availability improved under hypoxic conditions, which led to improved growth in small flounders. Large flounders (a parts per thousand yen200 mm TL) from all year-classes fed on prickleback fishes (Stichaeidae) and walleye pollock Gadus chalcogrammus juveniles. The growth of large flounders was enhanced by an increase in the abundance of Stichaeidae fishes and G. chalcogrammus juveniles. - OOKI Atsushi, MIWA Kazuji, ONISHI Hiroji, KAMEI Yoshihiko, KOBAYASHI Naoto, KUMA KenshiBUNSEKI KAGAKU 公益社団法人 日本分析化学会 62 (12) 1071 - 1078 0525-1931 2013/12 [Refereed][Not invited]
A shipboard observation was conducted in Funka Bay of Hokkaido from October 2011 to August 2012. Volatile organic halogenated compounds (halocarbons) in seawater collected at coastal, basin and sea shore sampling sites were measured by purge and trap GC-MS method. The spatial and temporal distributions of bromoform (CHBr3) were obtained, and we analyzed the origin of the compound. The minimum concentration of bromofoun (15 pmol L-1) was found in December. The bromoform concentration in the basin area increased from 20 pmol L-1 to 25 pmol L-1 at a rate of 5 pmol L-1 month(-1) during the phytoplankton spring bloom period (March-April). This increase would have been derived from the phytoplankton production of bromoform. The concentration increased from April to August at a rate of 4 pmol L-1 month(-1), and the maximum concentration of 42 pmol L-1 in basin area was found in August. Much higher concentrations were found in the coastal area (125 pmol L-1) and the sea shore (up to 1800 pmol L-1). The late summer bromoform maximum found in the basin area would be derived from macro algal production near the sea shore. - KOBAYASHI Naoto, ISODA Yutaka, TAKATSU Tetsuya, KIMURA Osamu, KAMEI Yoshihiko海と空 海洋気象学会 88 (3) 127 - 133 0503-1567 2013/03/22 [Refereed][Not invited]
- Ren Uchida, Kenshi Kuma, Aya Omata, Satoko Ishikawa, Nanako Hioki, Hiromichi Ueno, Yutaka Isoda, Keiichiro Sakaoka, Yoshihiko Kamei, Shohgo TakagiJOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 118 (3) 1257 - 1271 2169-9275 2013/03 [Refereed][Not invited]
We measured water-column iron concentrations from west to east along 47 degrees N in the subarctic North Pacific, and in the Bering Sea. In the North Pacific dissolved Fe (D-Fe) showed surface depletion, mid-depth maxima at 1000-1500 m (west, 1.3-1.6 nM; east, 0.9-1.1 nM), and a gradual decrease with depth below 3500-4000 m depth (west, 1.1-1.4 nM; east, 0.6-0.7 nM). D-Fe and total soluble Fe (T-Fe) in deep water showed a decreasing trend eastward. The higher iron concentrations in western deep waters probably result from higher inputs of dissolved Fe through atmospheric deposition or lateral transport. In contrast, D-Fe throughout the Bering Sea showed a consistent depth regime characterized by a rapid increase with depth to mid-depths, a gradual increase with depth in intermediate water to a maximum of 1.6-1.7 nM at 1500-2250 m, and a gradual decrease with depth to 1.3-1.4 nM at 3700 m. Higher iron concentrations and deeper D-Fe maxima in the Bering Sea are likely due to higher biological productivity and greater and deeper D-Fe input from the decomposition of sinking particulate organic matter in deep water. We suggest that the higher concentrations and deeper input of D-Fe as well as PO4 and humic-type fluorescent dissolved organic matter in the Bering Sea probably results from the longer time for the accumulation of decomposition products resulting from iron supply from the organic-rich downslope sediment along the steep continental slopes and slow replacement of the deep water in the Bering Sea Basin. - 山本 潤, 岩森 利弘, 星 直樹, 阿部 拓三, 坂岡 桂一郎, 亀井 佳彦, 高木 省吾, 沼本 修, 阪 幸宏, 桜井 泰憲, 末岡 和久, 有村 博紀, 渡邉 日出海水産技術 水産総合研究センター 5 (2) 171 - 174 1883-2253 2013/02 [Not refereed][Not invited]
本研究では支援船に大型特殊な設備を必要とせずに運用が可能な2,000m級小型ROVシステムの開発と運用法を構築した。本システムはランチャ内に搭載したリチウムイオンバッテリからビークルとランチャに電源を供給し，またランチャをロープで垂下することにより汎用の設備による巻上／下げで潜航／浮上が可能となっている。当初の運用ではランチャに接続する一次ケーブルと水中の荷重を支えるロープとに複雑な絡みが発生したが，絡みを軽減させる器具と低伸縮のロープを用いることにより解消しその運用法を確立した。 - KOBAYASHI Naoto, ISODA Yutaka, TAKATSU Tetsuya, KIMURA Osamu, KAMEI Yoshihiko海と空 海洋気象学会 88 (2) 43 - 48 0503-1567 2012/11/30 [Refereed][Not invited]
- Saori Kitayama, Kenshi Kuma, Eri Manabe, Koji Sugie, Hyoe Takata, Yutaka Isoda, Kenji Toya, Sei-Ichi Saitoh, Shohgo Takagi, Yoshihiko Kamei, Keiichiro SakaokaJournal of Geophysical Research: Oceans 114 (8) 2169-9291 2009/08/08 [Refereed][Not invited]
[1] Dissolved Fe in the western and central North Pacific Ocean was characterized by surface depletion, middepth maxima and, below that, a slight decrease with depth similar to the vertical distributions of nutrients, apparent oxygen utilization, Fe(III) hydroxide solubility, and humic-type fluorescence (H-flu) intensity. Dissolved Fe concentrations ([D-Fe], < 0.22-μm fraction) in the deep water column were one-half lower in the central region (0.3-0.6 nM) than the western region (0.5-1.2 nM) although the Fe(III) solubility ([Fe(III)sol], < 0.025-μm fraction) levels and distributions in deep waters were almost the same between both regions with middepth maxima (∼0.6 nM) at 500-1500-m depth range and then a gradual decrease to ∼0.3 nM at 5000-m depth. Higher [D-Fe] than [Fe(III)sol] in the deep water column of the western region results from the higher production of dissolved Fe from the decomposition of sinking particulate organic matter in the western region than the central region because of the high atmospheric and/or lateral Fe inputs in the western region. Similarity between [D-Fe] level and [Fe(III)sol] value at each deep water depth in the central region may be attributed to [D-Fe] being nearly in the solubility equilibrium with Fe(III) hydroxide in seawater. Strong linear correlation between [D-Fe] and H-flu intensity in the central region and relatively similar linear relationships between [Fe(III)sol] and H-flu intensity in the western and central regions are the first confirmation that humic-type fluorescent dissolved organic matter may be responsible for [D-Fe] in the deep water column as natural organic ligands complexing with Fe(III). Copyright 2009 by the American Geophysical Union. - The summer hydrographic surveys of the southeastern Bering Sea shelf and shelf break, carried out by T?S Oshoro-maruMizobata K, S. Saitoh, K. Kuma, T. Meguro, Y. Kajiwara, S. Takagi, Y. Kamei, K. SakaokaKAIYO MONTHLY 50 116 - 126 2008 [Not refereed][Not invited]
- 山口 篤, 目黒 敏美, 梶原 善之, 高木 省吾, 亀井 佳彦, 坂岡 桂一郎水産海洋研究 68 (4) 269 - 269 0388-9149 2004/11/10 [Not refereed][Not invited]
- Maki Nagasawa, Toshiyuki Hibiya, Yoshihiro Niwa, Michio Watanabe, Yutaka Isoda, Shogo Takagi, Yoshihiko KameiJournal of Geophysical Research: Oceans 107 (12) 2002/12/15Recent numerical experiments [Hibiya et al., 1996, 1998, 2002] predicted that the energy cascade across the internal wave spectrum down to small dissipation scales was under strong control by parametric subharmonic instabilities that transfer energy from the low vertical wave number, double-inertial frequency wave band to a high vertical wave number, near-inertial frequency wave band. To test whether or not the numerically predicted energy cascade process is actually dominant in the real deep ocean, we deployed a total of 106 expendable current profilers over a large area in the North Pacific to examine the spatial distribution of high vertical wave number (vertical wavelength ∼25 m) shear. At midlatitudes, significant enhancement of the 25 m vertical shear was found over prominent generation regions of semidiurnal internal tides such as the Hawaiian Ridge and the Izu-Ogasawara Ridge where the semidiurnal tidal frequency exceeds twice the local inertial frequency. At high latitudes, in contrast, no significant enhancement of the 25 m vertical shear was found to occur even over another prominent generation region of semidiurnal internal tides, the Aleutian Ridge, where the semidiurnal tidal frequency is less than twice the local inertial frequency. We find that the spatial distribution of the intensity of the 25 m vertical shear correlates very well with that of the low vertical wave number, double-inertial frequency internal wave energy numerically predicted by Nagasawa et al. [2000] and Niwa and Hibiya [2001a, 2001b]. This is the first in situ evidence for the dominant role of parametric subharmonic instability in transferring deep ocean internal wave energy down to small dissipation scales. This study provides a theoretical framework for future attempts to determine the large-scale structure of mixing over the world's oceans.
- Yoshimasa Uehara, Masahiro Ue, Yoshihiko Kamei, Motoo Baba, Ken Kikuchi, Kunimoto Hotta, Koichi Makimura, Kazuhiko Shibuya, Kazuo Suzuki, Shiro Naoe, Shoichi NiimiThe Japanese journal of antibiotics 55 (4) 446 - 81 0368-2781 2002/08
- Y Kamei, T Takatsu, S Takagi, T Nakatani, T Takahashi, T MaedaNIPPON SUISAN GAKKAISHI 65 (2) 223 - 229 0021-5392 1999/03 [Refereed][Not invited]
In order to elucidate the association between the distribution and maturation of adult walleye pollock Theragra chalcogramma, otter trawl samplings were carried out in the Japan Sea off the southwest Hokkaido in October from 1989 to 1994, CPUE values of walleye pollock were significantly higher in the coastal region than those in the offshore region through the sampling years except for 1994. Proportions of males were significantly higher in the coastal region except for 1993 and 1994, Many males were nearly mature, and no differences in male gonad indices were found either between coastal and offshore regions or among the coastal areas. In contrast, females collected in the coastal region were more mature than those in the offshore region. Clear geographical differences in body length were not found either among males or among females. Sexual differences in reproductive behavior and maturity might be responsible for the skewed distribution pattern of adult walleye pollock in October. - K. Kooka, T. Takatsu, Y. Kamei, T. Nakatani, T. TakahashiFisheries Science 64 (5) 686 - 693 0919-9268 1998/10 [Refereed][Not invited]
Vertical distributions of adult walleye pollock Theragra chalcogramma and oceanographic conditions were examined in the northern Japan Sea. In the daytime, most walleye pollock were distributed from 150 to 250 m depth in April and from 400 to 500 m depth in October. Between 150 and 500 m depth, temperatures in October (0.4-8.8°C) were similar to those in April (0.5-5.4°C), salinity levels were fairly uniform in both months (34.0-34.2 PSU), and dissolved oxygen concentrations were 4.6-6.1 ml/l in April and 4.7-6.4 ml/l in October. The main foods of walleye pollock in April were the amphipod Themisto japonica, the euphausiid Thysanoessa longipes, and the chaetognath Sagitta elegans. Daytime weighted mean depths of T. longipes were significantly greater in October than in April. Biomass of T. longipes in the habitat of walleye pollock was significantly greater than other layers in both months. The seasonal change in vertical distribution of walleye pollock is presumably related to food availability of T. longipes. - KOOKA Kouji, TAKATSU Tetsuya, KAMEI Yoshihiko, NAKATANI Toshikuni, TAKAHASHI ToyomiNIPPON SUISAN GAKKAISHI 日本水産學會 63 (4) 537 - 541 0021-5392 1997/07/15 [Refereed][Not invited]
The diet and feeding intensity of walleye pollock Theragra chalcogramma were investigated in April and October 1993, and in April 1994. Specimens ranging from 262 to 456mm in standard length were sampled with a mid-water trawl off Hiyama Subprefecture and Aomori Prefecture in the northern Japan Sea. The main food items were large-sized zooplankton. In April, pollock fed chiefly on euphausiids (Thysanoessa longipes), chaetognaths, and hyperiid amphipods (Themisto japonica). In October, the main food organisms were hyperiid amphipods (T. japonica). Stomach-content weight indices indicated that the feeding intensity of pollock was stronger in April (after spawning) than in October (before spawning). The numerical compositions of food categories in April differed among sampling stations. Such differences were not observed in October. It seems likely that the distinct variation of diets in April is ascribed to geographic differences in zooplankton composition in the mesopelagic zone. - S Takagi, T Maeda, Y Kamei, T Nakatani, T Takatsu, T TakahashiNIPPON SUISAN GAKKAISHI 62 (2) 205 - 212 0021-5392 1996/03 [Refereed][Not invited]
In order to elucidate the distribution pattern of walleye pollock Theragra chalcogramma off southwestern Hokkaido in the Japan Sea, trawling and acoustic surveys, and hydrographic observations were conducted in early April from 1989 to 1993, In 1991 and 1993, the Tsushima Warm Current Water was widely distributed in the coastal area of Aomori Prefecture, and a large number of walleye pollock were collected in the southwestern area off Hokkaido. In contrast, this water was observed only in a restricted coastal area of Aomori Prefecture in 1989 and 1990, and walleye pollock were found distributed in a coastal area 20-30 miles off Aomori Prefecture. Although an annual change in the distribution of walleye pollock was observed, they were concentrated in the area of the horizontal thermal front between the Tsushima Warm Current Water and the Japan Sea Proper Water every year. From these observations, it appears that the migration of walleye pollock. in early spring is closely related to the behavior of the Tsushima Warm Current Water in the Japan Sea off Aomori Prefecture. - Hideo Miyake, Seiji Sasaki, Hidekazu Yamaguchi, Kiyoshi Masuda, Gen Anma, Yoshihiko KameiJournal of Oceanography 51 (1) 99 - 109 0916-8370 1995/02Thermohaline staircases off Cape Erimo, Hokkaido are described and their physical properties are compared with those in other seas. The mean fluxes for heat and salt across the interface induced by salt finger were estimated as 105 cal cm-2d-1, and 0.03 g cm-2d-1, respectively. These values were in the same order as those in Caribbean Sea. The "effective eddy diffusivities" were also in the same order as the Caribbean ones. This suggests that the double-diffusive convection plays on important role on the water mass conversions occurring in the interfrontal zone between the Oyashio and the Kuroshio Waters. © 1995 Oceanographic Society of Japan.
MISC
- 令和2年度 北水協会研究助成事業 報告噴火湾における底生生物資源と漁場環境に関する研究（３）底生生物資源の変動2021/05
- 令和元年度 北水協会研究助成事業 報告噴火湾における底生生物資源と漁場環境に関する研究（３）底生生物資源の変動2020/05
- 高津哲也, 中屋光裕, 神山晃汰, 亀井佳彦, 小林直人, 飯田高大, 野呂恭成 水産海洋研究 84- (3) 2020
- 平成30年度 北水協会研究助成事業 報告噴火湾における底生生物資源と漁場環境に関する研究（３）底生生物資源の変動2019/05
- 平成29年度 北水協会研究助成事業報告 噴火湾における底生生物資源と漁場環境に関する研究 III 底生漁業資源の変動高津哲也, 中屋光裕, 亀井佳彦, 小林直人, 飯田高大, 鈴木孝太, 中脇鴻陽, 山岡秀圭, 粂信之介 2018/04
- 平成28年度 北水協会研究助成事業報告 噴火湾における底生生物資源と漁場環境に関する研究 III 底生生物資源の変動高津哲也, 亀井佳彦, 中屋光裕, 小林直人, 飯田高大, 鈴木孝太, 折野和樹 2017/05
- 平成27年度 北水協会研究助成事業報告 噴火湾における底生生物資源と漁場環境に関する研究 III 底生生物資源の変動高津哲也, 亀井佳彦, 中屋光裕, 小林直人, 鈴木孝太, 田村純一, 折野和樹 2016/05
- 平成26年度 北水協会研究助成事業報告 噴火湾における底生生物資源と漁場環境に関する研究 III 底生漁業資源の変動高津哲也, 亀井佳彦, 中屋光裕, 小林直人, 鈴木孝太, 中谷敏邦 2015/04
- Shimizu Yusaku, Ooki Atsushi, Kuma Kenshi, Onishi Hiroji, Kamei Yoshihiko, Kobayashi Naoto Abstracts of Annual Meeting of the Geochemical Society of Japan 62- 89 -89 2015CH2I2、C2H5Iなど揮発性有機ヨウ素化合物（volatile organoiodine compound:VOI）は、海から大気へヨウ素を供給するキャリアーとして機能する。本研究では、VOIと生物生産性や有機物分解との関係を調べるために、北海道噴火湾で2012年3月から2014年12月の隔月に海水を採取し、海水中VOI濃度をパージ＆トラップ-ガスクロマトグラフ-質量分析法で測定した。
春季植物プランクトンブルーム終了後の5月以降にVOI濃度は急激に増加し始め、6月から7月に年間ピークに達した。ピーク深度はVOI成分により異なった。このようなピーク深度の違いは、生成メカニズムの違いを示しており、こうした海水中VOIの生成メカニズムの違いは、大気への放出特性にも反映されると考えられる。 - 平成25年度 北水協会研究助成事業報告 III 底生漁業資源の変動高津哲也, 亀井佳彦, 稲垣祐太, 木村修, 小林直人, 中谷敏邦 2014/04
- Shimizu Yusaku, Ooki Atsuhi, Kuma Kenshi, Oonishi Hiroji, Kamei Yoshihiko, Kobayashi Naoto Abstracts of Annual Meeting of the Geochemical Society of Japan 61- 202 -202 2014CH2I2などの海水中の揮発性有機ヨウ素化合物(Volatile organoiodine compound；VOI)は、海洋から大気へのヨウ素の主なキャリアーとして知られるが、生成過程などは明らかになっていない。本研究では、VOIと生物生産性や有機物分解との関係を明らかにするため、VOIと生物化学パラメータのモニタリングを行った。北海道噴火湾にて、VOI（CH2I2、CH3I、CH2ClI）濃度や、生物科学パラメータの定点測定を、2012年3月から2014年6月まで行った。春季の植物プランクトンブルームが終焉し、植物プランクトンが老化、死滅する時期に、VOIが多量に生成されることがわかった。CH2I2増分が2013年は2012年の半分であったことより、VOI生成量には経年差がみられた。
- 前川 和義, 松崎 優哉, 亀井 佳彦, 坂岡 佳一郎, 安間 洋樹, 木村 暢夫 日本水産工学会 学術講演会 学術講演論文集 2014- 147 -148 2014
- 平成24年度 北水協会研究助成事業報告 噴火湾における底生魚類資源と漁場環境に関する研究 III底生魚類の資源変動高津哲也, 亀井佳彦, 稲垣祐太, 木村修, 小林直人, 中谷敏邦 2013/04
- 平成23年度 北水協会研究助成事業報告 噴火湾における底生魚類資源と漁場環境に関する研究 III底生魚類の資源変動高津哲也, 亀井佳彦, 稲垣祐太, 中谷敏邦, 木村修, 小林直人 2012/04
- Naoki Hoshi, Keiichiro Sakaoka, Takuzo Abe, Yoshihiko Kamei, Shogo Takagi NPAFC Doc. 1226. 2010/02 [Not refereed][Not invited]
- 栗原縁, 渡部千種, 高木省吾, 亀井佳彦, 坂岡桂一郎, 星直樹, 阿部拓三, 桜井泰憲 水産海洋学会研究発表大会講演要旨集 2010- 19 2010 [Not refereed][Not invited]
- 渡部千種, 栗原縁, 高木省吾, 亀井佳彦, 坂岡桂一郎, 星直樹, 阿部拓三, 桜井泰憲 水産海洋学会研究発表大会講演要旨集 2010- 89 2010 [Not refereed][Not invited]
- Saori Kitayama, Kenshi Kuma, Eri Manabe, Koji Sugie, Hyoe Takata, Yutaka Isoda, Kenji Toya, Sei-ichi Saitoh, Shohgo Takagi, Yoshihiko Kamei, Keiichiro Sakaoka JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 114- (8) C08019, doi:10.1029/2008JC004754 2009/08 [Not refereed][Not invited]
Dissolved Fe in the western and central North Pacific Ocean was characterized by surface depletion, middepth maxima and, below that, a slight decrease with depth similar to the vertical distributions of nutrients, apparent oxygen utilization, Fe(III) hydroxide solubility, and humic-type fluorescence (H-flu) intensity. Dissolved Fe concentrations ([D-Fe], <0.22-mu m fraction) in the deep water column were one-half lower in the central region (0.3-0.6 nM) than the western region (0.5-1.2 nM) although the Fe(III) solubility ([Fe(III)sol], <0.025-mu m fraction) levels and distributions in deep waters were almost the same between both regions with middepth maxima (similar to 0.6 nM) at 500-1500-m depth range and then a gradual decrease to similar to 0.3 nM at 5000-m depth. Higher [D-Fe] than [Fe(III)sol] in the deep water column of the western region results from the higher production of dissolved Fe from the decomposition of sinking particulate organic matter in the western region than the central region because of the high atmospheric and/or lateral Fe inputs in the western region. Similarity between [D-Fe] level and [Fe(III)sol] value at each deep water depth in the central region may be attributed to [D-Fe] being nearly in the solubility equilibrium with Fe(III) hydroxide in seawater. Strong linear correlation between [D-Fe] and H-flu intensity in the central region and relatively similar linear relationships between [Fe(III)sol] and H-flu intensity in the western and central regions are the first confirmation that humic-type fluorescent dissolved organic matter may be responsible for [D-Fe] in the deep water column as natural organic ligands complexing with Fe(III). - Salmon Stock Assessment in the North Pacific Ocean, 2009NPAFC Documents 1193 1 -8 2009 [Not refereed][Not invited]
- 2008 T/V Oshoro-maru Salmon Research CruisesNPAFC Documents 1158 1 -17 2009 [Not refereed][Not invited]
- 2007 T/V Oshoro-maru Salmon Research CruisesNPAFC Documents 1088 1 -26 2008 [Not refereed][Not invited]
- Results of 2006 Salmon Research Cruise of the Oshoro maruNPAFC Documents 1021 1 -16 2007 [Not refereed][Not invited]
- Results of 2005 Salmon Research Cruise of the Oshoro maruNPAFC Documents 940 1 -19 2006 [Not refereed][Not invited]
- 山口篤, 横井裕, 栗山圭輔, 亀井佳彦, 坂岡桂一郎, 池田勉 日本海洋学会大会講演要旨集 2005- 193 2005/09/05 [Not refereed][Not invited]
- 栗藤 亜希子, 平岡 優子, 高津 哲也, 伊村 一雄, 小林 直人, 亀井 佳彦 水産海洋研究 69- (3) 145 -155 2005/08 [Not refereed][Not invited]
- Tsuyoshi Shimura, Jun Yamamoto, Yoshihiko Kamei and Yasunori Sakurai: "Possible Spawning by the Japanese common squid, Todarodes pacificus at Yamato rise, Sea of Japan" Phuket mar. biol. Cent. Res. Bull.66: 267-273(2005)2005 [Not refereed][Not invited]
- Toshimi Meguro, Yoshiyuki Kajiwara, Shogo Takagi, Yoshihiko Kamei, Keiichiro Sakaoka and Jun-ichi Kimura: " Results of 2003 Salmon Research Cruise of the Oshoro maru" NPAFC Doc.840 (2005)2005 [Not refereed][Not invited]
- 山口 篤, 目黒 敏美, 梶原 善之, 高木 省吾, 亀井 佳彦, 坂岡 桂一郎 水産海洋研究 68- (4) 269 -269 2004/11/10
- 山口篤, 今尾史義, 佐野史和, 池田勉, 坂岡桂一郎, 亀井佳彦 日本海洋学会大会講演要旨集 2004- 299 2004/03/26 [Not refereed][Not invited]
- T.Meguro, Y.Kajiwara, S.Takagi, Y.Kamei, K.Sakaoka and J.Kimura:"Results of 2003 Salmon Research Cruise of the Oshoro maru"NPAFC Doc.748(2004)2004 [Not refereed][Not invited]
- T.Meguro, Y.Kajiwara, S.Takagi, Y.Kamei, K.Sakaoka and J.Kimura:"Results of 2002 Salmon Research Cruise of the Oshoro maru", NPAFC Doc.,663 22p(2003)2003 [Not refereed][Not invited]
- Nagasawa, M., T.Hibiya, Y.Niwa, M.Watanabe, Y.Isoda, S.Takagi, and Y.Kamei:"Distribution of fine-scale shear in the deep waters of the North Pacific obtained using expendable current profilers", J. Geophys. Res., 107(C12), 3221, doi:10.1029/2002JC00137・・・2002 [Not refereed][Not invited]
Nagasawa, M., T.Hibiya, Y.Niwa, M.Watanabe, Y.Isoda, S.Takagi, and Y.Kamei:"Distribution of fine-scale shear in the deep waters of the North Pacific obtained using expendable current profilers", J. Geophys. Res., 107(C12), 3221, doi:10.1029/2002JC001376(2002)* - Meguro,T.,Kamei,Y.,Kobayashi,N., and Ito, S.:"Results of the 2001 Salmon Research Cruises of the Hokusei Maru", NPAFC Doc.,548:1-21(2001)2001 [Not refereed][Not invited]
- 谷津 明彦, 森 純太, 田中 博之, 渡邊 朝夫, 長澤 和也, 石田 行正, 目黒 敏美, 亀井 佳彦, 桜井 泰憲 水産海洋研究 64- (4) 246 -247 2000/11/30
- A Yatsu, T Watanabe, J Mori, K Nagasawa, Y Ishida, T Meguro, Y Kamei, Y Sakurai FISHERIES OCEANOGRAPHY 9- (2) 163 -170 2000/06 [Not refereed][Not invited]
Variability in catch-per-unit-effort (CPUE) was examined for the autumn cohort of Ommastrephes bartramii collected with research driftnets during 1979-1998 along five longitudinal transects passing through the Subarctic, Transitional and Subtropical Domains in the North Pacific. CPUE was generally low during the period of intensive commercial driftnet fishing (1980-1992) and increased following the 1992 moratorium on the use of large-scale driftnets. However, CPUE levels were low for the cohorts hatched in 1992 and 1996 (captured in subsequent years owing to a one-year life of O. bartramii) that experienced low sea surface temperatures from hatching to recruitment. Among similar-aged squid collected from 180 degrees and 179 degrees 30'W in June, mantle lengths were significantly greater in 1997 than during 1995-96. These findings suggest that the driftnet fishery and sea surface temperatures from hatching to recruitment strongly affected stock abundance and possibly growth. - Meguro,T.,Kamei,Y.,Kobatashi,N.,Yoshida,T. and Kimura,O.:“Results of the 2000 Salmon research cruises of the Hokusei maru”,NPAFC Doc. 486(2000)2000 [Not refereed][Not invited]
- KAMEI Yoshihiko, TAKATSU Tetsuya, TAKAGI Shogo, NAKATANI Toshikuni, TAKAHASHI Toyomi, MAEDA Tatsuaki NIPPON SUISAN GAKKAISHI 65- (2) 223 -229 1999/03/15 [Not refereed][Not invited]
In order to elucidate the association between the distribution and maturation of adult walleye pollock Theragra chalcogramma, otter trawl samplings were carried out in the Japan Sea off the southwest Hokkaido in October from 1989 to 1994. CPUE values of walleye pollock were significantly higher in the coastal region than those in the offshore region through the sampling years except for 1994. Proportions of males were significantly higher in the coastal region except for 1993 and 1994. Many males were nearly mature, and no differences in male gonad indices were found either between coastal and offshore regions or among the coastal areas. In contrast, females collected in the coastal region were more mature than those in the offshore region. Clear geographical differences in body length were not found either among males or among females. Sexual differences in reproductive behavior and maturity might be responsible for the skewed distribution pattern of adult walleye pollock in October. - Yamaguchi,H., Takagi,S., Kamei Y., Yoshida T., Kimura J., Gen Anma and Onishi,H.:"The 1999 International Cooperative Salmon Research Cruise of The Oshoro Maru", NPAFC Doc.419 (1999)1999 [Not refereed][Not invited]
- Takagi shogo, Sakurai Yasunori, Kamei Yoshihiko, Myoi Takako, Sakaoka Keiichiro, Shiga Naonobu Bulletin of the Faculty of Fisheries,Hokkaido University 48- (1) 13 -28 1997/08 [Not refereed][Not invited]
Oceanographic conditions and distribution of pelagic nekton during the summer and fall in 1995 and 1996 in the northwestern North Pacific Ocean were examined. The gillnet survey and hydrographic observations were conducted along 155°E longitude from 32° to 44° N latitude. The Kuroshio Front located at the northern boundray of the Kuroshio Extension current was found near 38°N in the summer and fall. In the summer, warm water from the Kuroshio was found in the Subarctic Domain. The warm water was associated with an increase in chlorophyll-a and zooplankton. In the fall, Intermediate Cold Water occured in the Subarctic Domain, and concentration of nutrients and chlorophyll-a were high in fine structure. The distribution of pelagic nekton differed in the summer and fall. In the summer, the dominant species north side of the front were pink salmon Oncorhynchus gorbuscha and chum salmon O.keta. The dominant species around the front was flying squid Ommastrephes bartramii. In the fall, the dominant species in subtropical waer were flying squid and dolphin Coryphaena hippurus. The distribution of flying squid was controlled by the Kuroshio Front. In the summer, the front corresponded to the boundary between LL-size group (north side) and the small-size group (south side). In the fall, the front corresponded to the boundary between immature (north side) and mature (south side) squid. - TAKAGI Shogo, MAEDA Tatsuaki, KAMEI Yoshihiko, NAKATANI Toshikuni, TAKATSU Tetsuya, TAKAHASHI Toyomi NIPPON SUISAN GAKKAISHI 62- (2) 205 -212 1996/03/15 [Not refereed][Not invited]
In order to elucidate the distribution pattern of walleye pollock Theragra chalcogramma off southwestern Hokkaido in the Japan Sea, trawling and acoustic surveys, and hydrographic observations were conducted in early April from 1989 to 1993. In 1991 and 1993, the Tsushima Warm Current Water was widely distributed in the coastal area of Aomori Prefecture, and a large number of walleye pollock were collected in the southwestern area off Hokkaido. In contrast, this water was observed only in a restricted coastal area of Aomori Prefecture in 1989 and 1990, and walleye pollock were found distributed in a coastal area 20-30 miles off Aomori Prefecture. Although an annual change in the distribution of walleye pollock was observed, they were concentrated in the area of the horizontal thermal front between the Tsushima Warm Current Water and the Japan Sea Proper Water every year. From these observations, it appears that the migration of walleye pollock in early spring is closely related to the behavior of the Tsushima Warm Current Water in the Japan Sea off Aomori Prefecture. - Y. Ishida, S. Ito, G. Anma, T. Meguro, S. Takagi, Y. Kamei, N. D. Davis, and K. W. Myers : "Salmon Stock Assessment aboard the Japanese Salmon Research Vessels in the North Pacific Ocean, 1996", North Pacific Anadromous Fish Commission, 210 : 1-29 (1996)1996 [Not refereed][Not invited]
- 前田 辰昭, 高木 省吾, 亀井 佳彦, 梶原 善之, 目黒 敏美, 中谷 敏邦 北海道立水産試験場研究報告 (42) p1 -14 1993/12
- 梶原 善之, 飯田 浩二, 亀井 佳彦 Bulletin of the Faculty of Fisheries,Hokkaido University 41- (4) p205 -212 1990/11
Research Grants & Projects
- 北太平洋に於ける表層性魚類およびイカ類の生物学的研究Date (from‐to) : 1989
- Pelagic fish and squids ecology in the North PacificDate (from‐to) : 1989