Search

Your search keyword '"Masahide Kaeriyama"' showing total 9 results
Start Over Author "Masahide Kaeriyama" Language english
9 results on '"Masahide Kaeriyama"'

1. Differentiating salmonid migratory ecotypes through stable isotope analysis of collagen: Archaeological and ecological applications.

Author

Eric Guiry, Thomas C A Royle, R G Matson, Hillary Ward, Tyler Weir, Nicholas Waber, Thomas J Brown, Brian P V Hunt, Michael H H Price, Bruce P Finney, Masahide Kaeriyama, Yuxue Qin, Dongya Y Yang, and Paul Szpak

Subjects
Medicine, Science
Abstract

The ability to distinguish between different migratory behaviours (e.g., anadromy and potamodromy) in fish can provide important insights into the ecology, evolution, and conservation of many aquatic species. We present a simple stable carbon isotope (δ13C) approach for distinguishing between sockeye (anadromous ocean migrants) and kokanee (potamodromous freshwater residents), two migratory ecotypes of Oncorhynchus nerka (Salmonidae) that is applicable throughout most of their range across coastal regions of the North Pacific Ocean. Analyses of kokanee (n = 239) and sockeye (n = 417) from 87 sites spanning the North Pacific (Russia to California) show that anadromous and potamodromous ecotypes are broadly distinguishable on the basis of the δ13C values of their scale and bone collagen. We present three case studies demonstrating how this approach can address questions in archaeology, archival, and conservation research. Relative to conventional methods for determining migratory status, which typically apply chemical analyses to otoliths or involve genetic analyses of tissues, the δ13C approach outlined here has the benefit of being non-lethal (when applied to scales), cost-effective, widely available commercially, and should be much more broadly accessible for addressing archaeological questions since the recovery of otoliths at archaeological sites is rare.

Published
2020
Full Text
View/download PDF

2. WTO must ban harmful fisheries subsidies

Author

Gert van Santen, John M. Anderies, Donovan Campbell, Tyler D. Eddy, Omu Kakujaha-Matundu, Bryce D. Stewart, Marten Scheffer, Jessica Fanzo, Rowenna Gryba, F. Stuart Chapin, Denis Worlanyo Aheto, Katina Roumbedakis, Ibrahim Issifu, Gordon R. Munro, Shakuntala H. Thilsted, Ibukun Jacob Adewumi, Evgeny A. Pakhomov, Grant Murray, Jason F. Shogren, Unai Pascual, Satoshi Yamazaki, Margaret Spring, Carlos M. Duarte, Kathleen Segerson, U. Rashid Sumaila, Precious Agbeko Dzorgbe Mattah, Kyle Gillespie, Saleem Mustafa, Lan Xiao, Joshua Adotey, Frances Westley, Francis K. E. Nunoo, Frank Asche, Zuzy Anna, Boris Worm, D. R. Fraser Taylor, Diva J. Amon, Roshni S. Mangar, Cassandra M. Brooks, Frederik Noack, Brooks Kaiser, Nathan J. Bennett, William W. L. Cheung, Dwight Owens, S. Kim Juniper, Derek Armitage, Karly McMullen, Dawn Kotowicz, Enric Sala, Paul O. Onyango, Francis E. Asuquo, Kristin M. Kleisner, Monirul Islam, Juliano Palacios Abrantes, Tony Charles, Dana D. Miller, Sarah Harper, Louise S. L. Teh, Juan José Alava, Aurélien Paulmier, Jeremy B. C. Jackson, Santiago de la Puente, Colin W. Clark, Jennifer J. Silver, Robert Blasiak, Colette C. C. Wabnitz, Gretchen C. Daily, Lydia C. L. Teh, John A. List, Alessandro Tavoni, Philippe D. Tortell, Tabitha Mallory, Jaime Mendo, Amadou Tall, Essam Yassin Mohammed, Romola V. Thumbadoo, Kristen Hopewell, Rebecca R. Helm, Mauricio Castrejón, Elena M. Bennett, Jean-Baptiste Thiebot, Jorge Jimenez Ramon, Patrick Kimani, Gerald G. Singh, Kátia Meirelles Felizola Freire, Johannes A. Iitembu, Sara E. Cannon, Jorge Ramírez, Richard S.J. Tol, Evelyn Pinkerton, Andrew Forrest, Juan Camilo Cárdenas Campo, Sadique Isahaku, Dyhia Belhabib, Moenieba Isaacs, Laura G. Elsler, Alessandro Tagliabue, Tom Okey, Tessa Owens, Alex J. Caveen, José-María Da-Rocha, Isigi Kadagi, Hong Yang, Ekow Prah, Glenn-Marie Lange, Mary S. Wisz, Vicky W. L. Lam, Maartje Oostdijk, Daniel Pauly, Torsten Thiele, Michel J. Kaiser, Christina C. Hicks, Nancy C. Doubleday, Nicholas K. Dulvy, Line Gordon, Thomas L. Frölicher, Kwasi Appeaning Addo, Katherine Millage, Alfredo Giron-Nava, Heike K. Lotze, Lincoln Hood, Michelle Tigchelaar, Keita Abe, S. Karuaihe, Nancy Knowlton, Jessica A. Gephart, Noble K. Asare, Werner Antweiler, Christopher D. G. Harley, Kai M. A. Chan, Rodrigue Orobiyi Edéya Pèlèbè, Duncan Burnside, Sarah Glaser, Hussain Sinan, Garry D. Peterson, Olaf P. Jensen, Don Robadue, Mafaniso Hara, Sahir Advani, Andreea L. Cojocaru, Fiorenza Micheli, Gakushi Ishimura, Berchie Asiedu, Tu Nguyen, Mohammed Oyinlola, Lubna Alam, Maria A. Gasalla, Priscila F. M. Lopes, Mary Karumba, Austin J. Gallagher, Sufian Jusoh, Brian R. Copeland, Christopher M. Anderson, Alberta Jonah, Christopher D. Golden, Fabrice Stephenson, Douglas J. McCauley, Isaac Okyere, Jennifer Jacquet, Elke U. Weber, Benjamin S. Halpern, Olanike Kudirat Adeyemo, Neil Adger, Nina Wambiji, Kristina M. Gjerde, A. Eyiwunmi Falaye, Polina Orlov, Umi Muawanah, Trevor Church, Denise Breitburg, J. P. Walsh, Edward H. Allison, Cullen S. Hendrix, Curtis A. Suttle, Thuy Thi Thanh Pham, Cesar Bordehore, Michael Harte, Xavier Basurto, Carol McAusland, Rainer Froese, Adibi R. M. Nor, Anne-Sophie Crépin, Karen C. Seto, Abhipsita Das, Philippe Cury, Masahide Kaeriyama, Peter Freeman, Dacotah-Victoria Splichalova, Nobuyuki Yagi, Natalie C. Ban, Larry B. Crowder, Véronique Garçon, Amanda T. Lombard, Katie R. N. Florko, Nicolás Talloni-Álvarez, Riad Sultan, Lisa A. Levin, Mimi E. Lam, Evans K. Arizi, Richard T. Carson, Megan Bailey, Steven J. Lade, Zahidah Afrin, Dianne Newell, Shanta C. Barley, Colin Barnes, Villy Christensen, Dirk Zeller, Simon A. Levin, Kolliyil Sunil Mohamed, Marta Flotats Aviles, Jonathan D. R. Houghton, Daniel J. Skerritt, Karin E. Limburg, Meaghan Efford, Michael C. Melnychuk, Lanre Badmus, Sebastián Villasante, Carie Hoover, Evan Andrews, Daniel Peñalosa, Allison N. Cutting, Nathan Pacoureau, Melissa Walsh, Wisdom Akpalu, Kafayat Adetoun Fakoya, Ling Cao, Edward B. Barbier, Clare Fitzsimmons, Alex Rogers, Robert Arthur, Daniel Marszalec, Jean-Baptiste Jouffray, Carl Folke, Anna Schuhbauer, Mazlin Mokhtar, Juan Mayorga, Ingrid van Putten, S.L. Akintola, Stephen Polasky, Lance Morgan, Jesper Stage, Lucas Brotz, M. Selçuk Uzmanoğlu, Boris Dewitte, Ahmed Khan, Ernest Obeng Chuku, Veronica Relano, Nicholas Polunin, Griffin Carpenter, Virginie Bornarel, Max Troell, Bárbara Horta e Costa, Lian E. Kwong, Mairin C. M. Deith, Valérie Le Brenne, Dan Laffoley, Hugh Govan, Ronaldo Angelini, Juan Carlos Villaseñor-Derbez, Mark J. Gibbons, Ambre Soszynski, Ola Flaaten, Stella Williams, M. Nicole Chabi, S. R. Carpenter, Prateep Kumar Nayak, David Obura, Scott Barrett, Philippe Le Billon, Patrízia Raggi Abdallah, John J. Bohorquez, Adriana Rosa Carvalho, Andrés M. Cisneros-Montemayor, Paul R. Ehrlich, John Kurien, Juan Carlos Seijo, Dominique Benzaken, Brian Crawford, Callum M. Roberts, Gabriel Reygondeau, Xue Jin, Julia Adelsheim, Mohd Talib Latif, Annie Mejaes, Frank Meere, Jeffrey McLean, Jennifer Dianto Kemmerly, Henrik Österblom, Savior K. S. Deikumah, Tayler M. Clarke, Aart de Zeeuw, Frédéric Le Manach, Maria Grazia Pennino, Quentin A Hanich, David R. Boyd, Sumaila, U Rashid, Skerritt, Daniel J, Schuhbauer, Anna, Villasante, Sebastian, Cisneros-Montemayor, Andrés M, Sinan, Hussain, Burnside, Duncan, Abdallah, Patrízia Raggi, Abe, Keita, Addo, Kwasi A, Adelsheim, Julia, Adewumi, Ibukun J, Adeyemo, Olanike K, Adger, Neil, Adotey, Joshua, Advani, Sahir, Afrin, Zahidah, Aheto, Deni, Akintola, Shehu L, Akpalu, Wisdom, Alam, Lubna, Alava, Juan José, Allison, Edward H, Amon, Diva J, Anderies, John M, Anderson, Christopher M, Andrews, Evan, Angelini, Ronaldo, Anna, Zuzy, Antweiler, Werner, Arizi, Evans K, Armitage, Derek, Arthur, Robert I, Asare, Noble, Asche, Frank, Asiedu, Berchie, Asuquo, Franci, Badmus, Lanre, Bailey, Megan, Ban, Natalie, Barbier, Edward B, Barley, Shanta, Barnes, Colin, Barrett, Scott, Basurto, Xavier, Belhabib, Dyhia, Bennett, Elena, Bennett, Nathan J, Benzaken, Dominique, Blasiak, Robert, Bohorquez, John J, Bordehore, Cesar, Bornarel, Virginie, Boyd, David R, Breitburg, Denise, Brooks, Cassandra, Brotz, Luca, Campbell, Donovan, Cannon, Sara, Cao, Ling, Cardenas Campo, Juan C, Carpenter, Steve, Carpenter, Griffin, Carson, Richard T, Carvalho, Adriana R, Castrejón, Mauricio, Caveen, Alex J, Chabi, M Nicole, Chan, Kai M A, Chapin, F Stuart, Charles, Tony, Cheung, William, Christensen, Villy, Chuku, Ernest O, Church, Trevor, Clark, Colin, Clarke, Tayler M, Cojocaru, Andreea L, Copeland, Brian, Crawford, Brian, Crépin, Anne-Sophie, Crowder, Larry B, Cury, Philippe, Cutting, Allison N, Daily, Gretchen C, Da-Rocha, Jose Maria, Das, Abhipsita, de la Puente, Santiago, de Zeeuw, Aart, Deikumah, Savior K S, Deith, Mairin, Dewitte, Bori, Doubleday, Nancy, Duarte, Carlos M, Dulvy, Nicholas K, Eddy, Tyler, Efford, Meaghan, Ehrlich, Paul R, Elsler, Laura G, Fakoya, Kafayat A, Falaye, A Eyiwunmi, Fanzo, Jessica, Fitzsimmons, Clare, Flaaten, Ola, Florko, Katie R N, Aviles, Marta Flotat, Folke, Carl, Forrest, Andrew, Freeman, Peter, Freire, Kátia M F, Froese, Rainer, Frölicher, Thomas L, Gallagher, Austin, Garcon, Veronique, Gasalla, Maria A, Gephart, Jessica A, Gibbons, Mark, Gillespie, Kyle, Giron-Nava, Alfredo, Gjerde, Kristina, Glaser, Sarah, Golden, Christopher, Gordon, Line, Govan, Hugh, Gryba, Rowenna, Halpern, Benjamin S, Hanich, Quentin, Hara, Mafaniso, Harley, Christopher D G, Harper, Sarah, Harte, Michael, Helm, Rebecca, Hendrix, Cullen, Hicks, Christina C, Hood, Lincoln, Hoover, Carie, Hopewell, Kristen, Horta E Costa, Bárbara B, Houghton, Jonathan D R, Iitembu, Johannes A, Isaacs, Moenieba, Isahaku, Sadique, Ishimura, Gakushi, Islam, Monirul, Issifu, Ibrahim, Jackson, Jeremy, Jacquet, Jennifer, Jensen, Olaf P, Ramon, Jorge Jimenez, Jin, Xue, Jonah, Alberta, Jouffray, Jean-Baptiste, Juniper, S Kim, Jusoh, Sufian, Kadagi, Isigi, Kaeriyama, Masahide, Kaiser, Michel J, Kaiser, Brooks Alexandra, Kakujaha-Matundu, Omu, Karuaihe, Selma T, Karumba, Mary, Kemmerly, Jennifer D, Khan, Ahmed S, Kimani, Patrick, Kleisner, Kristin, Knowlton, Nancy, Kotowicz, Dawn, Kurien, John, Kwong, Lian E, Lade, Steven, Laffoley, Dan, Lam, Mimi E, Lam, Vicky W L, Lange, Glenn-Marie, Latif, Mohd T, Le Billon, Philippe, Le Brenne, Valérie, Le Manach, Frédéric, Levin, Simon A, Levin, Lisa, Limburg, Karin E, List, John, Lombard, Amanda T, Lopes, Priscila F M, Lotze, Heike K, Mallory, Tabitha G, Mangar, Roshni S, Marszalec, Daniel, Mattah, Preciou, Mayorga, Juan, McAusland, Carol, McCauley, Douglas J, McLean, Jeffrey, McMullen, Karly, Meere, Frank, Mejaes, Annie, Melnychuk, Michael, Mendo, Jaime, Micheli, Fiorenza, Millage, Katherine, Miller, Dana, Mohamed, Kolliyil Sunil, Mohammed, Essam, Mokhtar, Mazlin, Morgan, Lance, Muawanah, Umi, Munro, Gordon R, Murray, Grant, Mustafa, Saleem, Nayak, Prateep, Newell, Dianne, Nguyen, Tu, Noack, Frederik, Nor, Adibi M, Nunoo, Francis K E, Obura, David, Okey, Tom, Okyere, Isaac, Onyango, Paul, Oostdijk, Maartje, Orlov, Polina, Österblom, Henrik, Owens, Dwight, Owens, Tessa, Oyinlola, Mohammed, Pacoureau, Nathan, Pakhomov, Evgeny, Abrantes, Juliano Palacio, Pascual, Unai, Paulmier, Aurélien, Pauly, Daniel, Pèlèbè, Rodrigue Orobiyi Edéya, Peñalosa, Daniel, Pennino, Maria G, Peterson, Garry, Pham, Thuy T T, Pinkerton, Evelyn, Polasky, Stephen, Polunin, Nicholas V C, Prah, Ekow, Ramírez, Jorge, Relano, Veronica, Reygondeau, Gabriel, Robadue, Don, Roberts, Callum, Rogers, Alex, Roumbedakis, Katina, Sala, Enric, Scheffer, Marten, Segerson, Kathleen, Seijo, Juan Carlo, Seto, Karen C, Shogren, Jason F, Silver, Jennifer J, Singh, Gerald, Soszynski, Ambre, Splichalova, Dacotah-Victoria, Spring, Margaret, Stage, Jesper, Stephenson, Fabrice, Stewart, Bryce D, Sultan, Riad, Suttle, Curti, Tagliabue, Alessandro, Tall, Amadou, Talloni-Álvarez, Nicolá, Tavoni, Alessandro, Taylor, D R Fraser, Teh, Louise S L, Teh, Lydia C L, Thiebot, Jean-Baptiste, Thiele, Torsten, Thilsted, Shakuntala H, Thumbadoo, Romola V, Tigchelaar, Michelle, Tol, Richard S J, Tortell, Philippe, Troell, Max, Uzmanoğlu, M Selçuk, van Putten, Ingrid, van Santen, Gert, Villaseñor-Derbez, Juan Carlo, Wabnitz, Colette C C, Walsh, Melissa, Walsh, J P, Wambiji, Nina, Weber, Elke U, Westley, France, Williams, Stella, Wisz, Mary S, Worm, Bori, Xiao, Lan, Yagi, Nobuyuki, Yamazaki, Satoshi, Yang, Hong, and Zeller, Dirk

Subjects
0106 biological sciences, Aquatic Ecology and Water Quality Management, Multidisciplinary, WIMEK, 010504 meteorology & atmospheric sciences, Natural resource economics, 530 Physics, 010604 marine biology & hydrobiology, Subsidy, Aquatische Ecologie en Waterkwaliteitsbeheer, 01 natural sciences, WTO, fishery, subsidy, 13. Climate action, 550 Earth sciences & geology, SUBSÍDIOS, Life Science, 14. Life underwater, Business, 0105 earth and related environmental sciences
Abstract

Sustainably managed wild fisheries support food and nutritional security, livelihoods, and cultures (1). Harmful fisheries subsidies—government payments that incentivize overcapacity and lead to overfishing—undermine these benefits yet are increasing globally (2). World Trade Organization (WTO) members have a unique opportunity at their ministerial meeting in November to reach an agreement that eliminates harmful subsidies (3). We—a group of scientists spanning 46 countries and 6 continents—urge the WTO to make this commitment...

Published
2021
Full Text
View/download PDF

3. Differentiating salmonid migratory ecotypes through stable isotope analysis of collagen: Archaeological and ecological applications

Author

Hillary G.M. Ward, Masahide Kaeriyama, Paul Szpak, Thomas J. Brown, Michael H. H. Price, Yuxue Qin, Dongya Y. Yang, Tyler Weir, Bruce P. Finney, Thomas C.A. Royle, Brian P. V. Hunt, Eric J. Guiry, R. G. Matson, and Nicholas Waber

Subjects
0106 biological sciences, Male, Range (biology), Social Sciences, Marine and Aquatic Sciences, Fresh Water, 01 natural sciences, Biochemistry, Otolith, Salmon, Medicine and Health Sciences, Marine Fish, Isotope analysis, Carbon Isotopes, Multidisciplinary, biology, Ecotype, Ecology, Eukaryota, Agriculture, Biodiversity, Geography, Archaeology, Vertebrates, Inner Ear, Oncorhynchus, Medicine, Female, Collagen, Anatomy, Salmonidae, Research Article, Freshwater Environments, Fish Proteins, Conservation of Natural Resources, Ecology (disciplines), Science, Animal Scales, Fisheries, Marine Biology, Research and Analysis Methods, 010603 evolutionary biology, Bone and Bones, Animals, DNA, Ancient, Chemical Characterization, Isotope Analysis, Fish migration, Pacific Ocean, 010604 marine biology & hydrobiology, Ecology and Environmental Sciences, Organisms, Biology and Life Sciences, Proteins, Aquatic Environments, Bodies of Water, biology.organism_classification, Lakes, Ancient DNA, Fish, Ears, Earth Sciences, Animal Migration, Collagens, Head
Abstract

The ability to distinguish between different migratory behaviours (e.g., anadromy and potamodromy) in fish can provide important insights into the ecology, evolution, and conservation of many aquatic species. We present a simple stable carbon isotope (δ13C) approach for distinguishing between sockeye (anadromous ocean migrants) and kokanee (potamodromous freshwater residents), two migratory ecotypes of Oncorhynchus nerka (Salmonidae) that is applicable throughout most of their range across coastal regions of the North Pacific Ocean. Analyses of kokanee (n = 239) and sockeye (n = 417) from 87 sites spanning the North Pacific (Russia to California) show that anadromous and potamodromous ecotypes are broadly distinguishable on the basis of the δ13C values of their scale and bone collagen. We present three case studies demonstrating how this approach can address questions in archaeology, archival, and conservation research. Relative to conventional methods for determining migratory status, which typically apply chemical analyses to otoliths or involve genetic analyses of tissues, the δ13C approach outlined here has the benefit of being non-lethal (when applied to scales), cost-effective, widely available commercially, and should be much more broadly accessible for addressing archaeological questions since the recovery of otoliths at archaeological sites is rare.

Published
2020

4. Cost-effective accurate estimates of adult chum salmon, Oncorhynchus keta, abundance in a Japanese river using a radio-controlled helicopter

Author

Masahide Kaeriyama, Hideaki Kudo, Yousuke Koshino, Masaki Ichimura, and Akihiro Eto

Subjects
Radio-controlled helicopter, geography, Aerial census, geography.geographical_feature_category, biology, Salmon escapement, Salmon abundance, Estuary, Aquatic Science, Census, biology.organism_classification, Fishery, Altitude, Aerial photography, Abundance (ecology), Chum salmon, Weir, Environmental science, Oncorhynchus
Abstract

This paper describes an attempt in 2008 to establish an aerial census of adult chum salmon using a small radio-controlled (RC) helicopter. The Moheji River, located in southern Hokkaido, was chosen because all the salmon in a stretch of the river between a weir and the estuary are seine-netted every morning for artificial propagation. Aerial photographs of the river were taken from a RC helicopter equipped with a digital single-lens reflex camera and polarized filter. To quantify salmon density within the census area, the number of salmon per aerial photograph was counted using image-processing software. Salmon could be clearly identified in photographs taken from an altitude of ∼30 m. Salmon numbers estimated by aerial census and seine-netting were significantly related. The results indicate that a small RC helicopter can be used to generate adult salmon abundance data in Japanese rivers.

Published
2012

5. Molecular characterization and histochemical demonstration of salmon olfactory marker protein in the olfactory epithelium of lacustrine sockeye salmon (Oncorhynchus nerka)

Author

Hiroshi Ueda, Hideaki Kudo, Yoshiaki Doi, and Masahide Kaeriyama

Subjects
Male, endocrine system, DNA, Complementary, Physiology, Olfactory receptor neuron, Molecular Sequence Data, olfactory marker protein, cloning, chemical and pharmacologic phenomena, In situ hybridization, Teleostei, complex mixtures, Biochemistry, immunocytochemistry, Olfactory Mucosa, Complementary DNA, medicine, Animals, Amino Acid Sequence, Molecular Biology, Phylogeny, Messenger RNA, Olfactory receptor, Base Sequence, Sequence Homology, Amino Acid, biology, Histocytochemistry, bacterial infections and mycoses, biology.organism_classification, Molecular biology, Rats, Pacific salmon, medicine.anatomical_structure, biology.protein, bacteria, Oncorhynchus, Female, in situ hybridization, Sequence Alignment, Olfactory marker protein, Olfactory epithelium, olfactory receptor neuron
Abstract

Despite the importance of olfactory receptor neurons (ORNs) for homing migration, the expression of olfactory marker protein (OMP) is not well understood in ORNs of Pacific salmon (genus Oncorhynchus ). In this study, salmon OMP was characterized in the olfactory epithelia of lacustrine sockeye salmon ( O. nerka ) by molecular biological and histochemical techniques. Two cDNAs encoding salmon OMP were isolated and sequenced. These cDNAs both contained a coding region encoding 173 amino acid residues, and the molecular mass of the two proteins was calculated to be 19,581.17 and 19,387.11 Da, respectively. Both amino acid sequences showed marked homology (90%). The protein and nucleotide sequencing demonstrates the existence of high-level homology between salmon OMPs and those of other teleosts. By in situ hybridization using a digoxigenin-labeled salmon OMP cRNA probe, signals for salmon OMP mRNA were observed preferentially in the perinuclear regions of the ORNs. By immunohistochemistry using a specific antibody to salmon OMP, OMP-immunoreactivities were noted in the cytosol of those neurons. The present study is the first to describe cDNA cloning of OMP in salmon olfactory epithelium, and indicate that OMP is a useful molecular marker for the detection of the ORNs in Pacific salmon.

Published
2009

6. アジア系シロザケ2個体群の種内相互作用と成長パターンの時空間変動

Author

Masahide Kaeriyama, Hideaki Kudo, and Hyunju Seo

Subjects
intraspecific interaction, media_common.quotation_subject, Aquatic Science, Biology, density-dependent effect, Fish measurement, biology.organism_classification, Annual growth %, Competition (biology), Intraspecific competition, Fishery, back-calculation, Homogeneous, Sympatric speciation, Juvenile, Oncorhynchus, chum salmon, growth variability, scale analysis, media_common
Abstract

Spatiotemporal changes in growth patterns of chum salmon Oncorhynchus keta that returned to the Ishikari (Japan) and Namdae (Korea) rivers in 1984-1998 were investigated using scale analysis. Juvenile chum salmon from both populations left coastal marine areas after spring at a size of over 8 cm fork length (FL). In summer, juvenile salmon from the Namdae River entered the Okhotsk Sea at a larger FL than Ishikari River juveniles. There were no significant differences in annual growth between populations of one-, two-, and four-year-old fish. For three-year-old fish, however, Namdae River salmon had significantly higher synchronous and sympatric growth than Ishikari River salmon. Mean FL of adults was also larger in Namdae River salmon than in Ishikari River salmon. ANCOVA results showed (1) negative linear relations between FL and catch, (2) homogeneous slopes of those relations at regional and species levels, and (3) non-homogeneous slopes at the population level, indicating that density dependent effects on growth were most significant at this level. We concluded that growth of chum salmon was concurrently influenced by stronger effects of intrapopulation competition and weaker effects of inter- and intra-specific interactions in the Bering Sea., 鱗分析と体サイズのバックカリキュレーション法に基づき，1984-1998 年に北海道石狩川と韓国ナンダエ川へ回帰したシロザケの成長パターンの時空間変動を明らかにした。その結果，石狩川系幼魚が沿岸から小型で直接オホーツク海へ移動するのに対して，ナンダエ川幼魚は日本海を回遊後オホーツク海へ大型で移動することが明らかとなった。シロザケ4 歳魚の体サイズはベーリング海で3 歳時に種内あるいは個体群間より個体群内で強い密度依存効果を受けることが示唆された。

Published
2009

7. Sexual Differences in Homing Profiles and Shortening of Homing Duration by Gonadotropin-Releasing Hormone Analog Implantation in Lacustrine Sockeye Salmon (Oncorhynchus nerka) in Lake Shikotsu

Author

Kohei Yamauchi, Ayako Sato, Masahide Kaeriyama, Hiroshi Ueda, Masahiro Fukaya, Akihisa Urano, and Yonathan Zohar

Subjects
biology, Homing (biology), medicine.medical_treatment, Zoology, biology.organism_classification, Hatchery, Fishery, Steroid hormone, Gonadotropin-releasing hormone analog, medicine, Seasonal breeder, Oncorhynchus, Animal Science and Zoology, Sexual difference, Hormone
Abstract

Adult sockeye salmon (Oncorhynchus nerka) in Lake Shikotsu were captured in September, October and November adjacent to their natal hatchery prior to spawning. They were sampled for hormones, tagged and released in the center of lake. Fish were again sampled at recapture to characterize changes in steroid hormone levels in individual migrants as well as homing percentage and duration in each month. All males returned faster than females early in the breeding season, although a half of the tagged males did not return to the natal site late in the season (November). A high percentage of females always returned, and homing duration shortened late in the season. In males, the shortening of homing duration coincided with an increase in serum testosterone (T) and 11-ketotestosterone levels. In females, the shortening of homing duration corresponded to an elevation of serum T and 17α,20β-dihydroxy-4-pregnen-3-one (DHP) levels, and a drop in serum estradiol-17β levels. Sustained administration of gonadotropin-releasing hormone analog (GnRHa, via implants) in September greatly shortened homing duration, especially in females. GnRHa treatment caused a dramatic increase in serum DHP levels in both sexes on average. Individual GnRHa-treated males which rapidly returned, however, showed higher serum T levels and lower serum DHP levels than slower returning males. The present study indicates sexual differences in homing profiles as well as shortening of homing duration following GnRHa implantation in lacustrine sockeye salmon in Lake Shikotsu which may be reflective of changes in serum steroid hormone levels.

Published
1997

8. DEVELOPMENT OF THE RETINA IN THE CUTTLEFISH SEPIA ESCULENTA.

Author

ZHEN-LIN HAO, XIU-MEI ZHANG, HIDEAKI KUDO, and MASAHIDE KAERIYAMA

Abstract

To provide morphological bases for functional studies, the development of the photoreceptor cells in the retina of the cuttlefish Sepia esculenta from newly hatched juveniles to the adults was examined by light and electron microscopy. Four layers were distinguished in the retina: the rhabdomeric layer, subrhabdomeric layer, inner segmental layer, and plexiform layer. With the development of the retina, the structure of the plexiform layer becomes stronger. Morphometric data on the rhabdomeric microvilli from the newly hatched to the adult retinas are presented. The thickness of the rhabdomeric layer and the total surface area of the rhabdomeric microvilli present beneath a unit surface area of the retina show an exponential increase with developmental days; the diameter of the lens shows a linear increase with days. The results of our research show that the visual acuity and sensitivity of S. esculenta continuously increased with development. [ABSTRACT FROM AUTHOR]

Published
2010
Full Text
View/download PDF

9. Effect of global warming on the life history and population dynamics of Japanese chum salmon

Author

Yuxue Qin, Masahide Kaeriyama, and Hyunju Seo

Subjects
education.field_of_study, River ecosystem, biology, Global warming, Population, Climate change, Aquatic Science, biology.organism_classification, Fishery, Sea surface temperature, Effects of global warming, Carrying capacity, Oncorhynchus, Environmental science, education
Abstract

We have reviewed the effects of long-term climatic/oceanic conditions on the growth, survival, pro- duction dynamics, and distribution of Hokkaido chum salmon Oncorhynchus keta in Japan during the period 1945-2005 using path analysis, back-calculation, and scale analyses, and applied a prediction method based on the SRES-A1B scenario of the intergovernmental panel on climate change. The populations of Hokkaido chum salmon were found to have had high growth rates at age 1 year since the late 1980s. Path analysis indicated that the growth at age 1 year in the Okhotsk Sea was directly affected by warm sea surface temperature associated with global warming, with the increased growth at age 1 year resulting in higher rates of survival and large population sizes. Predictions on the global warming effects on the chum salmon were (1) decreased carrying capacity and distribu- tion area, (2) occurrence of a strong density-dependent effect, and (3) loss of migration route to the Sea of Okh- otsk, especially for Hokkaido chum salmon. We have also outlined the future challenges of establishing a sustainable conservation management scheme for salmon that include adaptive management and precautionary principles, as well as conservation of natural spawning populations and recovery of natural river ecosystems in Japan despite the warming climate.

Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results