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Artículos de revistas sobre el tema "Anguilla japonica Eels"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 16 de febrero de 2022

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1

Watanabe, Shigeru, and Kazutaka Shinozuka. "Spatial learning in Japanese eels (Anguilla japonica)." Animal Cognition 23, no. 1 (2019): 233–36. http://dx.doi.org/10.1007/s10071-019-01320-y.

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Abstract Japanese eels (Anguilla japonica) were trained on a Morris-type spatial learning task. There were four tubes in a pool, but the eels could hide in only one of these. The eels learned the position of the open tube, and maintained their performance when the pool was rotated to remove possible intra-maze cues. The eels could not maintain their performance in a dark room, suggesting that spatial learning involved extra-maze visual cues. When the position of the open tube was randomly changed every day, the performance of the eels in finding the open tube did not improve.

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2

Shuai, Fangmin, Xinhui Li, Wanling Yang, Weitao Chen, and Sovan Lek. "Habitat use of the Japanese eel (Anguilla japonica) and marbled eel (Anguilla marmorata) in the large subtropical Pearl River." Annales de Limnologie - International Journal of Limnology 57 (2021): 8. http://dx.doi.org/10.1051/limn/2021001.

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Anguilla spp. are catadromous fish and with a high economic value in Asia. The Pearl River is the largest river in southern China and is an important area for wild populations of Anguilla spp. However, until now, there has been little research on the eel's population structure and habitat use in the Pearl River. This study analyzed the population structure and habitat use characteristics of the Japanese eel (Anguilla japonica) and the marbled eel (Anguilla marmorata) in the Pearl River based on data collected from 2015 to 2018. A total of 181 Japanese eels and 56 marbled eels were collected, over half of which were middle-sized eels between 255 and 600 mm in length. Although they are sister species, Japanese eels mainly inhabit complex river habitats characterized by high river fractals and coefficients of fluvial facies, while marbled eels mainly inhabit wider and deeper river sections. The impact of physical environmental factors (such as river fractals, coefficients of fluvial facies and river width) on the distribution of these two species is greater than the impact of small-scale water quality environmental factors (such as DO concentration, temperature and clarity). The results of this study showed that wild Anguilla spp. resources in the Pearl River were extremely low and there was an urgent need for conservation and management of eel resources in south China.

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3

KNOPF, K., and R. LUCIUS. "Vaccination of eels (Anguilla japonicaandAnguilla anguilla) againstAnguillicola crassuswith irradiated L3." Parasitology 135, no. 5 (2008): 633–40. http://dx.doi.org/10.1017/s0031182008004162.

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SUMMARYThe original host of the swimbladder nematodeAnguillicola crassus, the Japanese eel (Anguilla japonica) and the recently colonized European eel (Anguilla anguilla) were immunized with 40 irradiated (500 Gy) 3rd-stage larvae (L3) of this parasite and challenged with an infection of 40 normal L3. The immunization induced a significant reduction of the number of adult worms developing from the challenge infection inA. japonica, but not inA. anguilla. The induced resistance (calculated using the relation of the number of adult worms in immunized eels and in non-immunized control eels) inA. japonicawas 87·3%±30·4%. Following a single infection, the percentage of adult worms found inA. japonicawas lower as compared toA. anguilla, and the few adult worms were much smaller, revealing a lower susceptibility ofA. japonicatoA. crassusin comparison toA. anguilla. Both eel species developed an antibody response againstA. crassus, but the level of antibody responses was not positively correlated with the protection against infection, suggesting that the antibody response is not a key element in resistance of eels againstA. crassus. This study suggests that the original host ofA. crassusis able to mount efficient protective immune responses against its parasite, whereas the newly acquired host seems to lack this ability.

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4

Tsukamoto, K., J. Aoyama, and M. J. Miller. "Migration, speciation, and the evolution of diadromy in anguillid eels." Canadian Journal of Fisheries and Aquatic Sciences 59, no. 12 (2002): 1989–98. http://dx.doi.org/10.1139/f02-165.

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Recent findings and hypotheses about the migration, spawning ecology, phylogenetic relationships, and possible mechanisms of speciation of anguillid eels are overviewed. The offshore distribution and otolith microstructure of small leptocephali suggest that the Japanese eel Anguilla japonica may spawn at seamounts west of the Mariana Islands in the western North Pacific during the new moon of each month from April to November. Some temperate eels have been found to remain in coastal areas after recruitment without a freshwater growth phase (ocean residents or "sea eels"), showing flexible patterns of migratory histories. Recent molecular phylogenetic studies suggest that the tropical eel Anguilla borneensis from the Borneo Island region is the most ancestral species. Every eel species or population has its own migration loop (migration route or life cycle) that connects their spawning area and growth habitats. Spatial and temporal shifts in these migration loops could cause separation into subpopulations, or speciation. Therefore, the large-scale migration of temperate eels probably evolved from local migrations of tropical eels as a result of long-distance dispersal of leptocephali from spawning sites in tropical waters of low latitude to temperate growth habitats at higher latitudes.

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5

Arai, Takaomi, Aya Kotake, and Madoka Ohji. "Variation in migratory history of Japanese eels, Anguilla japonica, collected in the northernmost part of its distribution." Journal of the Marine Biological Association of the United Kingdom 88, no. 5 (2008): 1075–80. http://dx.doi.org/10.1017/s0025315408001756.

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In order to examine the variation of migratory histories in the Japanese eel, Anguilla japonica, we measured otolith strontium (Sr) and calcium (Ca) concentrations by X-ray electron microprobe analysis in A. japonica collected in a coastal brackish water lake in the northernmost part of its distribution. Two migratory types that were categorized as river eels and estuarine eels were found. Estuarine eels were dominant (85%), while ordinary diadromous eels that had entered the freshwater habitat made up only 15% of the population. The low proportion of river eels suggested that the estuarine eels that inhabit the nearby coastal areas might make a larger reproductive contribution to the next generation in this area. There was no significant difference in growth between the river and estuarine eels, which suggested that the limited carrying capacity of the adjacent river and geographical features might be more effective in determining the habitat use of the Japanese eel than the genetic feature and food abundance at the northern edge of its distribution.

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6

Cho, Hye-Sun, Jong-Hwan Choi, Hong-Beom Ko, Jae-Sung Seo, and Jun-Cheul Ahn. "Evaluation of Major Nutrients of Domestic Farmed Eels Anguilla japonica." Korean Journal of Fisheries and Aquatic Sciences 44, no. 3 (2011): 237–42. http://dx.doi.org/10.5657/kfas.2011.0237.

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7

Igarashi, Yoji, Hong Zhang, Engkong Tan, et al. "Whole-Genome Sequencing of 84 Japanese Eels Reveals Evidence against Panmixia and Support for Sympatric Speciation." Genes 9, no. 10 (2018): 474. http://dx.doi.org/10.3390/genes9100474.

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The Japanese eel (Anguilla japonica), European eel (Anguilla anguilla), and American eel (Anguilla rostrata) are migratory, catadromous, temperate zone fish sharing several common life cycle features. The population genetics of panmixia in these eel species has already been investigated. Our extensive population genetics analysis was based on 1400 Gb of whole-genome sequence (WGS) data from 84 eels. It demonstrated that a Japanese eel group from the Kuma River differed from other populations of the same species. Even after removing the potential adapted/selected single nucleotide polymorphism (SNP) data, and with very small differences (fixation index [Fst] = 0.01), we obtained results consistently indicating that panmixia does not occur in Japanese eels. The life cycle of the Japanese eel is well-established and the Kuma River is in the center of its habitat. Nevertheless, simple reproductive isolation is not the probable cause of non-panmixia in this species. We propose that the combination of spawning area subdivision, philopatry, and habitat preference/avoidance accounts for the non-panmixia in the Japanese eel population. We named this hypothesis the “reproductive isolation like subset mapping” (RISM) model. This finding may be indicative of the initial stages of sympatric speciation in these eels.

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8

Sasai, Seiji, Toyoji Kaneko, Sanae Hasegawa, and Katsumi Tsukamoto. "Morphological alteration in two types of gill chloride cells in Japanese eels (Anguilla japonica) during catadromous migration." Canadian Journal of Zoology 76, no. 8 (1998): 1480–87. http://dx.doi.org/10.1139/z98-072.

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Gill chloride cell morphology and Na+,K+-ATPase activity were examined in cultured Japanese eels (Anguilla japonica) acclimated to fresh water (FW) or seawater (SW), and in yellow and silver eels caught in wild stocks. Gill Na+,K+-ATPase activity was higher in SW-acclimated cultured eels than in FW eels. Chloride cells were detected in both filament and lamellar epithelia by immunocytochemical staining using anti-Na+,K+-ATPase serum. The filament chloride cells were more abundant and larger in SW eels than in FW eels, whereas there was no apparent difference in lamellar chloride cells. In wild-caught eels, gill Na+,K+-ATPase activity increased as they developed from yellow to silver eels. Filament chloride cells in silver eels were more active than those in yellow eels. In contrast, lamellar chloride cells, which were frequently observed in yellow eels, had decreased in number or disappeared in silver eels. These findings suggest that chloride cells in the filament are responsible for excretion of excess salt in hyperosmotic environments, and that lamellar chloride cells may play a significant role in hypoosmotic environments, presumably acting as sites of ion uptake. The excellent euryhalinity of the Japanese eel may be due, at least in part, to the presence of functionally different types of chloride cells. The activation of filament chloride cells in silver eels in FW, together with the increase in Na+,K+-ATPase activity, could be interpreted as a preadaptive response to forthcoming entry into SW.

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9

Hung, H.-W., C.-F. Lo, C.-C. Tseng, and G.-H. Kou. "Antibody production in Japanese eels, Anguilla japonica Temminck & Schlegel." Journal of Fish Diseases 20, no. 3 (1997): 195–200. http://dx.doi.org/10.1046/j.1365-2761.1997.00290.x.

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10

Kim, Heeyong, Shingo Kimura, Akira Shinoda, Takashi Kitagawa, Yoshikazu Sasai, and Hideharu Sasaki. "Effect of El Niño on migration and larval transport of the Japanese eel (Anguilla japonica)." ICES Journal of Marine Science 64, no. 7 (2007): 1387–95. http://dx.doi.org/10.1093/icesjms/fsm091.

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Abstract Kim, H., Kimura, S., Shinoda, A., Kitagawa, T., Sasai, Y., and Sasaki, H. 2007. Effect of El Niño on migration and larval transport of the Japanese eel (Anguilla japonica). – ICES Journal of Marine Science, 64: –. To clarify the effect of an El Niño on the migration of Japanese eels (Anguilla japonica) in the western North Pacific, differences in migration patterns of eel larvae (leptocephali) in El Niño and non-El Niño years were compared qualitatively through a numerical particle-tracking model. Depending on interannual meridional displacements of the salinity front and bifurcation of the North Equatorial Current, transport of Japanese eel larvae to the Kuroshio was much less than to the Mindanao Current in an El Niño year, and recruitment to coastal habitats in Japan decreased in those years. In non-El Niño years, transport to the Kuroshio was twice as high, and recruitment to coastal habitats increased. If the spawning area of eels was independent of El Niño, transport differences between the two currents were not clear. In the western North Pacific, mesoscale eddies also played a significant role in dispersing eel larvae and prolonging their migration. Consequently, the changing oceanic conditions associated with climate change have resulted in decreased recruitment of Japanese eels, and the eddy effect on migration of the Japanese eel larvae needs to be added into the North Equatorial Current–Kuroshio system.

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11

Arai, Takaomi, Naoko Chino, and Aya Kotake. "Occurrence of estuarine and sea eels Anguilla japonica and a migrating silver eel Anguilla anguilla in the Tokyo Bay area, Japan." Fisheries Science 75, no. 5 (2009): 1197–203. http://dx.doi.org/10.1007/s12562-009-0153-6.

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12

Drouineau, Hilaire, Christian Rigaud, Françoise Daverat, and Patrick Lambert. "EvEel (evolutionary ecology-based model for eel): a model to explore the role of phenotypic plasticity as an adaptive response of three temperate eels to spatially structured environments." Canadian Journal of Fisheries and Aquatic Sciences 71, no. 10 (2014): 1561–71. http://dx.doi.org/10.1139/cjfas-2014-0090.

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Anguilla anguilla, Anguilla japonica, and Anguilla rostrata are three widely distributed catadromous and semelparous species characterized by a long and passive oceanic larval drift between their marine spawning grounds and nursery areas in continental waters. Their large, spatially heterogeneous environments combined with population panmixia and long and passive larval drift impair the possibility of local adaptation and favour the development of phenotypic plasticity. In this context, we developed EvEel (evolutionary ecology-based model for eel), a model that aims to explore the role of phenotypic plasticity as an adaptive response of eels. Results suggest that the spatial patterns in terms of sex ratio, length-at-silvering, and habitat use observed at both the distribution area and river catchment scales may actually be the result of three adaptive mechanisms to maximize individual fitness in spatially structured environments. We believe that considering phenotypic plasticity as a paradigm is required to develop appropriate models for this species.

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13

Kudo, Nozomi, Takeshi Miura, Chiemi Miura, and Kohei Yamauchi. "Expression and Localization of Eel Testicular ZP-homologues in Female Japanese Eels (Anguilla japonica)." Zoological Science 17, no. 9 (2000): 1297–302. http://dx.doi.org/10.2108/zsj.17.1297.

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14

Matsubara, Hajime, P. Mark Lokman, Yukinori Kazeto, et al. "Changes in Sex Steroids and Ovarian Steroidogenic Enzyme mRNA Levels in Artificially Maturing Japanese Eel (Anguilla japonica) and Naturally Maturing New Zealand Longfin Eel (Anguilla dieffenbachii) during Vitellogenesis." Fishes 4, no. 4 (2019): 52. http://dx.doi.org/10.3390/fishes4040052.

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Repeated hormone injections are routinely used to induce advanced stages of oogenesis in freshwater eels, but this approach may result in aberrant germ cell development. To investigate the underlying causes, levels of sex steroids (testosterone, T; estradiol-17β, E2) and ovarian steroidogenic enzyme mRNAs were compared between artificially maturing Japanese eels and wild-caught, spontaneously maturing New Zealand longfin eels. The latter were employed as reference, as wild Japanese eels in advanced stages of oogenesis are near-impossible to catch. Serum T levels in artificially maturing Japanese eel changed with stage in a pattern that was comparable to that in longfin eels. Likewise, ovarian mRNA levels of most steroidogenic enzyme genes were not qualitatively dissimilar between both eel species when taking developmental stage into account. However, aromatase (cyp19a) mRNA levels, together with serum E2 levels, rapidly increased in artificially maturing Japanese eels in mid-late stages of oogenesis (gonadosomatic index, GSI = 13.8%), whereas no such increase was evident in longfin eels (GSI ~ 6.9%). In addition, sex steroid and target gene mRNA levels fluctuated drastically with each hormone injection. We contend that expression of most target genes, possibly even that of cyp19a, during induced oogenesis could be “normal”, with the drastic fluctuations due most likely to hormone delivery through repeated injections. The effects of these fluctuations on gamete quality remain unknown and resolving this issue may prove fruitful in the future to further artificial propagation of anguillid eels.

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15

NAKAI, Toshihiro, Yoshifumi KANEMORI, Kazuhiro NAKAJIMA, and Kiyokuni MUROGA. "The fate of Pseudomonas anguilliseptica in artificially infected eels Anguilla japonica." Fish Pathology 19, no. 4 (1985): 253–58. http://dx.doi.org/10.3147/jsfp.19.253.

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16

Joh, Seong Joon, Yong Kuk Kwon, Min Chul Kim, et al. "Heterosporis anguillarum infections in farm cultured eels (Anguilla japonica) in Korea." Journal of Veterinary Science 8, no. 2 (2007): 147. http://dx.doi.org/10.4142/jvs.2007.8.2.147.

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17

Yi, Seung-Won, Myung-Jo You, Ho-Seong Cho, Chang-Seop Lee, Joong-Ki Kwon, and Gee-Wook Shin. "Molecular characterization of Aeromonas species isolated from farmed eels (Anguilla japonica)." Veterinary Microbiology 164, no. 1-2 (2013): 195–200. http://dx.doi.org/10.1016/j.vetmic.2013.02.006.

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18

Guan, Ruizhang, Xuehong Wang, and Guozhen Ke. "Age and growth of eels Anguilla japonica in a Chinese river." Journal of Fish Biology 45, no. 4 (1994): 653–60. http://dx.doi.org/10.1111/j.1095-8649.1994.tb00931.x.

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19

Takei, Yoshio, and Takamasa Tsuchida. "Role of the renin-angiotensin system in drinking of seawater-adapted eels Anguilla japonica: a reevaluation." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 279, no. 3 (2000): R1105—R1111. http://dx.doi.org/10.1152/ajpregu.2000.279.3.r1105.

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The role of ANG II, a potent dipsogenic hormone, in copious drinking of seawater eels was examined. SQ-14225 (SQ), an angiotensin-converting enzyme inhibitor, infused intra-arterially at 0.01–1 μg · kg−1 · min−1, depressed drinking and arterial blood pressure in a dose-dependent manner. The inhibition was accompanied by a small decrease in plasma ANG II concentration, which became significant at 1 μg · kg−1 · min−1. After the infusate was changed back to the vehicle, the depression of drinking and arterial pressure continued for >2 h, although plasma ANG II concentration rebounded above the level before SQ infusion. By contrast, infusion of anti-ANG II serum (0.01–1 μg · kg−1 · min−1) did not suppress drinking and arterial pressure, although plasma ANG II concentration decreased to undetectable levels. Plasma atrial natriuretic peptide and plasma osmolality, which influence drinking rate in eels, did not change during SQ or antiserum infusions. These results suggest that the renin-angiotensin system plays only a minor role in the vigorous drinking observed in seawater eels. The results also suggest that the antidipsogenic and vasodepressor effects of SQ in seawater eels are not due solely to the inhibition of ANG II formation in plasma.

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20

Lee, N.-S., J. Kobayashi, and T. Miyazaki. "Gill filament necrosis in farmed Japanese eels, Anguilla japonica (Temminck & Schlegel), infected with Herpesvirus anguillae." Journal of Fish Diseases 22, no. 6 (1999): 457–63. http://dx.doi.org/10.1046/j.1365-2761.1999.00197.x.

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21

Wong, Chris K. C., and D. K. O. Chan. "Isolation of viable cell types from the gill epithelium of Japanese eel Anguilla japonica." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 276, no. 2 (1999): R363—R372. http://dx.doi.org/10.1152/ajpregu.1999.276.2.r363.

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High-purity viable cells with low mitochondria (pavement cells) and mitochondria-rich content (chloride cells) were successfully isolated from the gill epithelium of Japanese eels, using three-step Percoll gradient low-speed centrifugation. Cytochemistry (silver staining for chloride, rhodamine-123, and Mitotracker for mitochondria and actin/spectrin immunofluorescence) and scanning electron microscope images were used to identify the cell types in the gill epithelium of the eel. Pavement cells were isolated at 97 and 98% purity for freshwater- and seawater-adapted eels, respectively, and chloride cells were obtained at 89 and 92% purity. The enzymatic activities of the isolated cells were determined. Na+-K+-ATPase, Mg2+-ATPase, and succinate dehydrogenase were found mainly in the chloride cell. Alkaline Ca2+-ATPase and low- and high-affinity Ca2+-ATPase were about twice as high in the chloride cell compared with the pavement cell. Transfer of eels to seawater resulted in enlargement of chloride cell sizes and significant increases in Na+-K+-ATPase, Mg2+-ATPase, and succinate dehydrogenase activities, while all Ca2+-ATPases declined by ∼60–80%. This is the first report demonstrating the successful isolation of freshwater chloride cells and also an exclusive method of getting high-purity seawater chloride cells. The isolated cells are viable and suitable for further cytological and molecular studies to elucidate the mechanisms of ionic transport.

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22

Miyake, Yoichi, Aigo Takeshige, Hikaru Itakura, et al. "Predation on glass eels of Japanese eel Anguilla japonica in the Tone River Estuary, Japan." Fisheries Science 84, no. 6 (2018): 1009–14. http://dx.doi.org/10.1007/s12562-018-1238-x.

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23

Han, Yu-San, Kuan-Mei Hsiung, Heng Zhang, et al. "Dispersal Characteristics and Pathways of Japanese Glass Eel in the East Asian Continental Shelf." Sustainability 11, no. 9 (2019): 2572. http://dx.doi.org/10.3390/su11092572.

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The Japanese eel Anguilla japonica is an important aquaculture fish species in the East Asian countries of Japan, China, Korea, and Taiwan. All glass eel fry are captured from the wild and understanding the recruitment patterns of the glass eel is important. The larvae of A. japonica are passively transported to the East Asian Continental Shelf by the North Equatorial Current, the Kuroshio, the Kuroshio intrusion currents, and coastal currents. In each location, recruitment time is diverse: It is November in Taiwan and April in the Yalu River. How the glass eels reach recruitment areas remains poorly understood. Here, we combine information from larval ages based on otolith increments, simulated drifting paths on the East Asian Continental Shelf, and main fishing seasons in each location of East Asia. We identify five main recruitment blocks: (1) The main Kuroshio, (2) The Taiwan Strait Warm Current, (3) The Taiwan Warm Current, (4) The Yellow Sea Warm Current and (5) The branch of Yellow Sea Warm Current. The counted age of the glass eels is significantly underestimated for the later recruits, possibly due to the cessation of the otolith edge growth under low water temperatures. This study clarifies the eel’s larval characteristics and transport mechanisms in the East Asia Continental Shelf, providing important information for its recruitment dynamics in the marine stage.

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24

Sasai, S., J. Aoyama, S. Watanabe, T. Kaneko, MJ Miller, and K. Tsukamoto. "Occurrence of migrating silver eels Anguilla japonica in the East China Sea." Marine Ecology Progress Series 212 (2001): 305–10. http://dx.doi.org/10.3354/meps212305.

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25

ITOI, Shiro, Misako NAKAYA, Gen KANEKO, Hidehiro KONDO, Keijiro SEZAKI, and Shugo WATABE. "Rapid identification of eels Anguilla japonica and Anguilla anguilla by polymerase chain reaction with single nucleotide polymorphism-based specific probes." Fisheries Science 71, no. 6 (2005): 1356–64. http://dx.doi.org/10.1111/j.1444-2906.2005.01102.x.

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26

Moravec, F., H. Taraschewski, D. Appelhoff, and O. Weyl. "A new species of Hysterothylacium (Nematoda: Anisakidae) from the giant mottled eel Anguilla marmorata in South Africa." Helminthologia 49, no. 3 (2012): 174–80. http://dx.doi.org/10.2478/s11687-012-0035-9.

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AbstractA new species of ascaridoid nematode, Hysterothylacium anguillae sp. n. (family Anisakidae), is described based on specimens recovered from the stomach and intestine of the giant mottled eel Anguilla marmorata Quoy et Gaimard from the Mngazi River, South Africa, collected in March–April 2011. It is characterized mainly by poorly developed lateral alae, a very short intestinal caecum and a long ventricular appendix, spicules 1.11–2.14 mm long (representing 5.2–5.8 % of body length), number of caudal papillae (19–21 pairs of preanals, 2 adanals and 5 postanals), presence of a median precloacal papilla (= ventromedian organ), tail tips of both sexes covered by minute spines, and by the shape and structure of lips. This is the first nominal species of Hysterothylacium described from an African freshwater fish and the second species of this genus reported from freshwater eels of the family Anguillidae. The following Indian congeneric species are considered species inquirendae: Hysterothalacium aetobathum Lakshmi, 2005, H. carutti Lakshmi, Rao et Shyamasundari, 1993, H. channai Lakshmi, 1995, H. fossillii Lakshmi, 1996, H. japonicum Rajialakshmi, 1996, H. kiranii Lakshmi, 1993, H. longicaecum Lakshmi, Rao et Shyamansundari, 1993, H. narayensis Lakshmi, 1997, H. nellorensis Lakshmi, 1996, H. neocornutum Rajialakshmi, Rao et Shyamasundari, 1992 and H. punctati Lakshmi, 1995. Of them, H. japonicum and H. neocornutum are transferred to Iheringascaris Pereira, 1935 as I. japonica (Rajialakshmi, 1996) comb. n. and I. neocornuta (Rajialakshmi, Rao et Shyamasundari, 1992) comb. n.

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27

Takei, Yoshio, and Hiroyuki Kaiya. "Antidiuretic Effect of Eel ANP Infused at Physiological Doses in Conscious, Seawater-Adapted Eels, Anguilla japonica." Zoological Science 15, no. 3 (1998): 399–404. http://dx.doi.org/10.2108/zsj.15.399.

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28

Arai, Takaomi, Aya Kotake, Madoka Ohji, Michael J. Miller, Katsumi Tsukamoto, and Nobuyuki Miyazaki. "Occurrence of sea eels of Anguilla japonica along the Sanriku Coast of Japan." Ichthyological Research 50, no. 1 (2003): 78–81. http://dx.doi.org/10.1007/s102280300011.

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29

Kakuta, Izuru, and Shiro Murachi. "Changes of iron content in eels (Anguilla japonica) infected with atypical Aeromonas salmonicida." Comparative Biochemistry and Physiology Part C: Comparative Pharmacology 105, no. 2 (1993): 275–78. http://dx.doi.org/10.1016/0742-8413(93)90207-2.

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30

Kumai, Yusuke, Katsumi Tsukamoto, and Mari Kuroki. "Growth and habitat use of two anguillid eels, Anguilla marmorata and A. japonica, on Yakushima Island, Japan." Ichthyological Research 67, no. 3 (2020): 375–84. http://dx.doi.org/10.1007/s10228-020-00732-y.

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31

García-Gallego, M., H. Akharbach, and M. de la Higuera. "Use of protein sources alternative to fish meal in diets with amino acids supplementation for the European eel (Anguilla anguilla)." Animal Science 66, no. 1 (1998): 285–92. http://dx.doi.org/10.1017/s1357729800009073.

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AbstractThis experiment was conducted to test two different protein sources as alternatives to the commonly used fish meal (FM) in the diet of the European eel (Anguilla anguilla). Six experimental diets were tested in three replicated lots of European eels. All diets contained the same protein and energy content (ca, 300 g crude protein per kg dry matter and 18·5 MJ/kg, respectively) but differed in the nature of the protein source: FM was the only protein source in the control diet and was fully or partially (0–5: 0–5) replaced by meat meal (MM) or sunflower meal (SFM) in four other diets; a sixth diet included SFM as the only protein source but was supplemented with several essential amino acids. Food intake, fish growth and several indices of diet and protein utilization were measured. MM clearly was the poorest protein source while SFM could replace, at least 0·5 of the FM with no significant reduction in performance. In addition, the European eel was able to utilize the supplement of essential amino acids. The full-SFM diet was improved significantly when supplemented and results were not statistically different from the control FM-based diet. Overall, a good correlation was found between the results of each diet and the respective essential amino acid index, calculated using as reference the essential amino acid requirements previously defined for another eel species, Anguilla japonica. This index could be used as a reliable measure for an a priori evaluation of alternative protein sources to be included in commercial foods for eels.

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32

SUZUKI, HITOMI, MASAYA KIMOTO, YUTA YOSHIZOE, et al. "DNA analysis method for detecting the mixing of foreign species of eel among many Anguilla japonica eels." NIPPON SUISAN GAKKAISHI 77, no. 5 (2011): 896–901. http://dx.doi.org/10.2331/suisan.77.896.

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33

Miyake, Yoichi, Aigo Takeshige, Hikaru Itakura, et al. "Correction to: Predation on glass eels of Japanese eel Anguilla japonica in the Tone River Estuary, Japan." Fisheries Science 84, no. 6 (2018): 1015–16. http://dx.doi.org/10.1007/s12562-018-1257-7.

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34

Tse, William Ka Fai, and Chris Kong Chu Wong. "nbce1 and H+–atpase mRNA expression are stimulated in the mitochondria-rich cells of freshwater-acclimating Japanese eels (Anguilla japonica)." Canadian Journal of Zoology 89, no. 4 (2011): 348–55. http://dx.doi.org/10.1139/z11-009.

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Mitochondria-rich cells (MRCs) of fish gills are well known for their roles in Na+ and Cl– excretion in seawater environment. However, the level of understanding of their roles in fresh water is limited. In this study, we used the Percoll gradient technique to isolate gill MRCs from Japanese eels ( Anguilla japonica Temminck and Schlegel, 1846) and measured the mRNA expression of two selected ion transporters, which were partially cloned in our laboratory: sodium bicarbonate co-transporter 1 (nbce1) and vacuolar proton pumps (H+–atpase). In addition, protein expressions of H+–ATPase and NBCe1 in whole gill were studied using Western blotting. The data indicated that both NBCe1 and H+–ATPase mRNA and protein expressions increased after seawater to freshwater transfer. This is the first report of changes in mRNA expression for these two ion transporters in MRCs of Japanese eels during seawater to freshwater transfer, confirming the roles of MRCs in osmoregulation in fresh water.

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35

NAKAI, Toshihiro, Munenori MIYAKAWA, Kiyokuni MUROGA, and Kumiko KAMITO. "The tissue distribution of atypical Aeromonas salmonicida in artificially infected Japanese eels, Anguilla japonica." Fish Pathology 24, no. 1 (1989): 23–28. http://dx.doi.org/10.3147/jsfp.24.23.

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36

Ando, Masaaki, Yasuaki Fujii, Takashi Kadota, et al. "Some Factors Affecting Drinking Behavior and Their Interactions in Seawater-Acclimated Eels, Anguilla japonica." Zoological Science 17, no. 2 (2000): 171–78. http://dx.doi.org/10.2108/zsj.17.171.

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37

Tomoda, Hidekazu, and Kazumasa Uematsu. "Morphogenesis of the Brain in Larval and Juvenile Japanese Eels, Anguilla japonica." Brain, Behavior and Evolution 47, no. 1 (1996): 33–41. http://dx.doi.org/10.1159/000113227.

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38

Wakiya, Ryoshiro, Kenzo Kaifu, and Noritaka Mochioka. "Growth conditions after recruitment determine residence-emigration tactics of female Japanese eels Anguilla japonica." Fisheries Science 82, no. 5 (2016): 729–36. http://dx.doi.org/10.1007/s12562-016-1006-8.

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39

Takei, Yoshio. "Changes in blood volume after alteration of hydromineral balance in conscious eels, Anguilla japonica." Comparative Biochemistry and Physiology Part A: Physiology 91, no. 2 (1988): 293–97. http://dx.doi.org/10.1016/0300-9629(88)90419-7.

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40

Kakuta, I., and T. Nakai. "Blood changes in japanese eels, Anguilla japonica, experimentally infected with typical or atypicalAeromonas salmonicida." Comparative Biochemistry and Physiology Part A: Physiology 103, no. 1 (1992): 151–55. http://dx.doi.org/10.1016/0300-9629(92)90255-o.

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41

Kaifu, Kenzo, Sachie Miyazaki, Jun Aoyama, Shingo Kimura, and Katsumi Tsukamoto. "Diet of Japanese eels Anguilla japonica in the Kojima Bay-Asahi River system, Japan." Environmental Biology of Fishes 96, no. 4 (2012): 439–46. http://dx.doi.org/10.1007/s10641-012-0027-0.

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42

Hsiung, Kuan-Mei, and Shingo Kimura. "Impacts of global warming on larval and juvenile transport of Japanese eels (Anguilla japonica)." Deep Sea Research Part II: Topical Studies in Oceanography 169-170 (November 2019): 104685. http://dx.doi.org/10.1016/j.dsr2.2019.104685.

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43

Dou, S. Z., Y. Yamada, A. Okamura, S. Tanaka, A. Shinoda, and K. Tsukamoto. "Observations on the spawning behavior of artificially matured Japanese eels Anguilla japonica in captivity." Aquaculture 266, no. 1-4 (2007): 117–29. http://dx.doi.org/10.1016/j.aquaculture.2007.02.032.

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44

Kakuta, I., M. Yukawa, K. Kitao, Y. Taguchi, and S. Murachi. "SIMULTANEOUS DETERMINATION OF NINE ELEMENTS IN PLASMA OF JAPANESE EELS, Anguilla japonica, INFECTED WITH ATYPICAL Aeromonas salmonicida BY PIXE." International Journal of PIXE 02, no. 03 (1992): 421–31. http://dx.doi.org/10.1142/s0129083592000440.

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Investigations of the levels of nine elements (P, S, Cl, K, Ca, Fe, Cu, Zn, Br) in plasma collected continuously from eels infected with atypical A. salmonicida by PIXE analysis were performed. The PIXE technique proved to be a powerful tool for performing multielement analysis in a small amount of blood collected by an intra-vascular cannulation technique. Decreases in Hb and plasma protein, P, Cl, Ca, Fe and Cu, and increase in plasma K were observed with the infection. On day 3, the reduction in plasma Zn were found in the control and the deseased groups. At the moribund stage, increased ammonia and decreased Br in plasma were observed. The decrease in Fe of the diseased eels was remarkable. No significant change in plasma S was found.

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45

Ando, M., and K. Nagashima. "Intestinal Na+ and Cl- levels control drinking behavior in the seawater-adapted eel Anguilla japonica." Journal of Experimental Biology 199, no. 3 (1996): 711–16. http://dx.doi.org/10.1242/jeb.199.3.711.

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To analyze drinking mechanisms in seawater teleosts, seawater-adapted eels were used as a model system. When the intestine of the eel was perfused with iso-osmotic mannitol, the eels drank sea water. However, when the perfusion medium was switched to iso-osmotic NaCl, seawater drinking was depressed. This depression was observed even after blocking NaCl absorption across the intestine by replacement of the perfusate with choline chloride or by treatment with furosemide, an inhibitor of NaCl and water absorption across the eel intestine. Furthermore, depression of drinking rate preceded an increase in urine flow by over 1 h. These results indicate that this depression is not due to a recovery of blood volume and suggest that intestinal Cl- itself inhibits drinking. Direct action of luminal Cl- on drinking behavior was further supported by the observation that perfusion with iso-osmotic NMDG-HCl, Tris-HCl, choline chloride and RbCl all inhibited seawater drinking. When NaCl in the perfusion medium was replaced with sodium acetate, sodium butyrate, sodium methylsulfate or NaSCN, the drinking rate was enhanced threefold, suggesting that Na+ itself stimulates drinking in the absence of Cl-. In the present study, concentrations of Na+ and Cl- in the swallowed fluid were also measured simultaneously. As the drinking rate was enhanced, the Na+ and Cl- concentrations in the gastrointestinal fluid were increased. On the basis of these results, it seems possible that high concentrations of Cl- in the intestine reduce the drinking rate, thus lowering esophageal Cl- concentration due to desalination of the ingested sea water. When Cl- concentration in the intestine falls below a certain level, Na+ will stimulate seawater drinking again.

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46

Sakaguchi, H., H. Suzuki, H. Hagiwara, et al. "Whole body autoradiography and microautoradiography in eels after intra-arterial administration of 125I-labeled eel ANP." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 271, no. 4 (1996): R926—R935. http://dx.doi.org/10.1152/ajpregu.1996.271.4.r926.

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125I-labeled eel atrial natriuretic peptide (ANP) was administered into the ventral or dorsal aorta of freshwater (FW) and seawater (SW) eels, Anguilla japonica, and the major target organs were explored by whole body autoradiography. Localization of the ANP binding in the target organs was also examined at tissue and cell levels by microautoradiography using tissue sections. Whole body autoradiography revealed that the specific label was accumulated predominantly in the gill, with lesser amounts in the atrium, kidney, liver, and urinary bladder. Autoradiographic grains were most dense in the secondary lamellae of the gill, particularly on the side of the efferent filamental artery. Other binding sites in target tissues were the glomerulus of the kidney, epicardium and endocardium of the atrium, bile duct/blood vessels of the liver, and interrenal cells of the head kidney. There was no difference in the distribution and density of grains between injections into the ventral aorta and dorsal aorta, although, in the former, injected 125I-labeled eel ANP passes through the gill before reaching peripheral target tissues. There was a tendency for downregulation of ANP binding sites in SW eels, especially in the gill. These results show that specific ANP binding sites are present in organs that are implicated in osmoregulation and cardiovascular regulation in eels and further suggest that the number of ANP binding sites varies according to changes in the environmental salinity.

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47

MISTRY, Abinash Chandra, Shinji HONDA, and Shigehisa HIROSE. "Structure, properties and enhanced expression of galactose-binding C-type lectins in mucous cells of gills from freshwater Japanese eels (Anguilla japonica)." Biochemical Journal 360, no. 1 (2001): 107–15. http://dx.doi.org/10.1042/bj3600107.

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Using a Japanese-eel (Anguilla japonica) gill cDNA subtraction library, two novel β-d-galactose-binding lectins were identified that belong to group VII of the animal C-type lectin family. The eel C-type lectins, termed eCL-1 and eCL-2, are simple lectins composed of 163 amino acid residues, including a 22-residue signal peptide for secretion and a single carbohydrate-recognition domain (CRD) of ∼ 130 residues typical of C-type lectins. The galactose specificity of the CRD was suggested by the presence of a QPD motif and confirmed by a competitive binding assay. Using Ruthenium Red staining, the lectins were shown to bind Ca2+ ions. SDS/PAGE showed that native eCL-1 and eCL-2have an SDS-resistant octameric structure (a tetramer of disulphide-linked dimers). Northern and Western blot analyses demonstrated high-level expression of eCL-1 and eCL-2 mRNAs and their protein products in gills from freshwater eels, which decreased markedly when the eels were transferred from freshwater to seawater. Immunohistochemistry showed that the eel lectins are localized in the exocrine mucous cells of the gill.

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48

Byeon, Hwa-Keun. "Fish Community and Upstream of Glass Eels (Anguilla japonica) in the Imjin River Estuary, Korea." Korean Journal of Lomnology 47, Special (2014): 31–38. http://dx.doi.org/10.11614/ksl.2014.47(s).031.

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49

Miyake, Yoichi, Marie-Agnès Tellier, Aigo Takeshige, Hikaru Itakura, Akira Yoshida, and Shingo Kimura. "Past and lost influence of the Kuroshio on estuarine recruitment of Anguilla japonica glass eels." Journal of Oceanography 76, no. 4 (2020): 259–70. http://dx.doi.org/10.1007/s10872-020-00543-9.

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50

Nakada, Tsutomu, Kambiz Zandi-Nejad, Yukihiro Kurita, et al. "Roles of Slc13a1 and Slc26a1 sulfate transporters of eel kidney in sulfate homeostasis and osmoregulation in freshwater." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 289, no. 2 (2005): R575—R585. http://dx.doi.org/10.1152/ajpregu.00725.2004.

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Sulfate is required for proper cell growth and development of all organisms. We have shown that the renal sulfate transport system has dual roles in euryhaline eel, namely, maintenance of sulfate homeostasis and osmoregulation of body fluids. To clarify the physiological roles of sulfate transporters in teleost fish, we cloned orthologs of the mammalian renal sulfate transporters Slc13a1 (NaSi-1) and Slc26a1 (Sat-1) from eel ( Anguilla japonica) and assessed their functional characteristics, tissue localization, and regulated expression. Full-length cDNAs coding for ajSlc13a1 and ajSlc26a1 were isolated from a freshwater eel kidney cDNA library. Functional expression in Xenopus oocytes revealed the expected sulfate transport characteristics; furthermore, both transporters were inhibited by mercuric chloride. Northern blot analysis, in situ hybridization, and immunohistochemistry demonstrated robust apical and basolateral expression of ajSlc13a1 and ajSlc26a1, respectively, within the proximal tubule of freshwater eel kidney. Expression was dramatically reduced after the transfer of eels from freshwater to seawater; the circulating sulfate concentration in eels was in turn markedly elevated in freshwater compared with seawater conditions (19 mM vs. 1 mM). The reabsorption of sulfate via the apical ajSlc13a1 and basolateral ajSlc26a1 transporters may thus contribute to freshwater osmoregulation in euryhaline eels, via the regulation of circulating sulfate concentration.

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