Yamada KT, Kitamura S, Abe S, Tajima Y, Matsuda A, Mead JG, Matsuishi TF
Scientific Reports 9(12723) 1-14 Aug 2019 [Refereed]
Two types of Berardius are recognised by local whalers in Hokkaido, Japan. The first is the ordinary Baird’s beaked whale, B. bairdii, whereas the other is much smaller and entirely black. Previous molecular phylogenetic analyses revealed that the...
Thi Phuong Dong Khuu, Yoko Saito, Naoki Tojo, Phuong Duy Nguyen, Thi Ngoc Hoa Nguyen and Matsuishi Takashi Fritz
International Journal of Food and Agricultural Economics 7(2) 127-140 Apr 2019 [Refereed]
This study aims to conduct the consumer’s willingness to pay (WTP) for traceable pork products by using the auction experiments methods, estimate the factors affecting to the WTP and identify the demand for specific information in traceability sys...
Aquaculture International 27(5) 1209-1229 Apr 2019 [Refereed]
Shrimp products play a vital role in the international trade of fisheries products. The main suppliers for shrimp products are developing nations such as Vietnam, Thailand, Bangladesh and other countries in Southeast Asia. Among them, Vietnam is o...
Maezawa T, Matsuishi T, Ito K, Kaji S, Tsunokawa M, Kawahara JI
Mammal Study 44(3) 205-213 Jul 2019 [Refereed]
Studies on odontocetes (e.g., porpoises) have revealed that these animals may adaptively use vision. The present study examined the contributions of vision to the approaching behavior of the harbor porpoise (Phocoena phocoena). When a porpoise app...
Ohishi K, Amano M, Nakamatsu K, Miyazaki N, Tajima Y, Yamada TK, Matsuda A, Ochiai M, Matsuishi TF, Taru H, Iwao H, Maruyama T
Journal of Veterinary Medical Science in press 2019 [Refereed]
A serologic investigation of Brucella infection was performed in 7 species of cetaceans inhabiting along the coast of Japan. A total of 32 serum samples were examined by enzyme-linked immunosorbent assay (ELISA) using Brucella abortus and B. canis...
Harlyan LI, Wu D, Kinashi R, Kaewnern M, Matsuishi T.
Canadian Journal of Fisheries and Aquatic Sciences 76(10) 1885-1893 2019 [Refereed]
Harvest control rules (HCRs) for sustainable fishery management have been developed for data-limited fish species for which stock assessments cannot be conducted. However, HCRs have largely not considered mixed-species catches, as when fishing-eff...
Fujii Y, Kato Y, Sakamoto K, Matsuishi T, Harada K, Koizumi A, Kimura O, Endo T, Haraguchi K
Marine Pollution Bulletin 136 230-242 Nov 2018 [Refereed]
Species-dependent profiles and regional trends in naturally produced halogenated bipyrroles (Br4Cl2-DBP and Cl7-MBP), methoxylated tetrabromodiphenyl ethers (MeO-BDEs), and anthropogenic erfluoroalkyl carboxylic acids (PFCAs) were investigated in ...
Recreational angling under appropriate management can contribute to the conservation of a fish population even for endangered fish, because anglers can enhance the social and economic foundation for the conservation of a fish population via anglin...
Kuroda M, Sasaki M, Yamada K, Miki N, Matsui N, Matsuishi T
PLoS ONE 13(9) e0202426 Sep 2018 [Refereed]
Dall's porpoise (Phocoenoides dalli) is one of most common North Pacific porpoise species, for which information on sound-emitting processes is limited. To evaluate the mechanism of click emission in the head of this porpoise, the distribution of ...
Shindo J, Sekizawa K, Okada A, Matsui N, Matsuida A, Matsuishi T
Japanese Journal of Zoo and Wildlife Medicine 23(3) 77-82 Sep 2018 [Refereed]
The morphological characteristic of the tongue of a Neonate Minke whale (Balaenoptera acutorostrata) was observed on gross and with scanning electron microscopy. The tongue was oval shaped, and had the marginal papillae of various forms on the bot...
Fisheries Research 204 269-274 Aug 2018 [Refereed]
Harbor porpoises (Phocoena phocoena) are often captured as bycatch in set net fisheries, which may have a large impact on their population and reduces the efficiency of fishing operations. Therefore, this study aimed to use passive acoustic monito...
Yamamoto Y, Yoshiyama T, Kajiwara K, Nakatani T, Matsuishi T
Fisheries Science 84(3) 425-433 May 2018 [Refereed]
Overfishing can affect life-history traits, resulting in population collapse, and oftentimes a decrease in length-at-age and maturation size in fish populations. However, little is known about these traits recovery mechanisms and time scales in ex...
Nippon Suisan Gakkaishi 84(1) 119-129 Jan 2018 [Refereed]
Sustainable recreational fisheries can be a conservation tool of fish population, even it is for an endangered species. Miyabe charr Salvelinus malma miyabei is a popular target for recreational anglers, which inhabits only in Lake Shikaribetsu, J...
Nakagun S, Shiozaki A, Ochiai M, Matsuda A, Tajima Y, Matsuishi T, Watanabe K, Horiuchi N, Kobayashi Y
Diseases of Aquatic Organisms 127 177-192 Mar 2018 [Refereed]
Beaked whales are among the least known group of cetaceans, and information regarding their pathology and parasitology are especially scarce. We describe a case of significant parasitism by a trematode found in the liver of an adult male Hubbs’ be...
Fujii Y, Kato Y, Sakamoto K, Matsuishi T, Harada K, Koizumi A, Kimura O, Endo T, Haraguchi K
Science of the Total Environment 616 554-563 2018 [Refereed]
This study investigated accumulation of perfluoroalkyl substances (PFASs), persistent organochlorines (OCs), and naturally produced halogenated compounds (NHCs), including brominated methylbipyrroles and methoxylated bromodiphenyl ethers, in liver...
Ochiai M, Nomiyama K, Isobe T, Yamada TK, Tajima Y, Matsuda A, Shiozaki A, Matsuishi T, Amano M, Iwata H, Tanabe S
Marine Environmental Research 128 124-132 Jul 2017 [Refereed]
This study investigated the accumulation of polybrominated diphenyl ethers (PBDEs) and their hydroxylated and methoxylated analogues (OH-PBDEs and MeO-PBDEs) in the blood of harbor porpoises, Dall's porpoises, and finless porpoises stranded or byc...
Matsuishi T, Matsuda A, Kuroda M, Sato M, Sato R, Ishikawa H
Risirhi Studies 43(36) 83-88 Mar 2017
Rishiri Island is located in the Sea of Japan off the northwest coast of Hokkaido, Japan. Stranding records for this island could be important information in understanding the migration patterns of cetaceans in the Sea of Japan. A total of 21 stra...
Fisheries Science 83(2) 171-180 Mar 2017 [Refereed]
Recreational angling is a globally popular leisure, which can be a threat or a useful conservation tool depending on the management strategy. Miyabe charr Salvelinus malma miyabei is an endemic fish that inhabits Lake Shikaribetsu, and a managemen...
Nozomi Kurihara, Yuko Tajima, Tadasu K. Yamada, Ayaka Matsuda and Takashi Matsuishi
Genetics and Molecular Biology 40(4) 803-807 Dec 2017 [Refereed]
The genus Mesoplodon (Cetacea: Odontoceti: Ziphiidae) is one of the few cetacean genera with the karyotype 2n = 42. The 2n = 42 karyotype of M. europaeus and M. carlhubbsi is largely consistent with the general cetacean karyotype 2n = 44, although...
Marine Pollution Bulletin 113(1-2) 282-286 Dec 2016 [Refereed]
We performed the first known study of polychlorinated biphenyls (PCBs) concentrations and patterns in the blubber and liver of a Hubbs’ beaked whale. Samples were pretreated with Supelclean™ sulfoxide and Discovery® Ag-ION solid phase extraction c...
Tsuboi U, Matsuishi T, Shibuya K, Takada Y, Aoyagi T, Tanizawa K, Ozawa R, Okazaki T
Nippon Suisan Gakkaishi 82(6) 884-890 Nov 2016 [Refereed]
In Lake Saiko, Kunimasu Oncorhynchus kawamurae was discovered and have been caught by recreational angling indistinguishable from a related species Himemasu Oncorhynchus nerka. From 2012 to 2014, we conducted creel survey for couple of days just a...
Nakamura T, Kimura O, Matsuda A, Matsuishi T, Kobayashi M, Endo T
Marine Ecology Progress Series 535 1-9 Sep 2015 [Refereed]
We analyzed radiocesium (134Cs and 137Cs) levels in the muscle tissue of several odontocetes and mysticetes stranded on the coast of Hokkaido (the northernmost island of Japan) in 2011 and 2012, following the Fukushima Dai-ichi Nuclear Power Plant...
Journal of Acoustical Society of America 138(3) 1451-1456 Sep 2015 [Refereed]
The process by which sound is propagated in the head of a toothed whale is still a subject of discussion. Investigating the distribution of acoustic impedance calculated by density and Young’s modulus is effective for quantitative comprehension be...
Nippon Suisan Gakkaishi 81(3) 418-428 May 2015 [Refereed]
In Lake Toya, sockeye salmon Oncorhynchus nerka is heavily caught by recreational angling and its population has widely fluctuated from year to year. Adaptive framework virtual population analysis (ADAPT VPA) was conducted as a step towards sound ...
Nippon Suisan Gakkaishi 81(1) 2-9 Jan 2015 [Refereed]
In Japan, Pacific saury fishing forecasts are indispensable information for fisheries. In this study, the abundance of Pacific saury in fishing grounds was predicted by using random forest and the forecast was evaluated by the Monte Carlo re-sampl...
Bulletin of Fisheries Sciences, Hokkaido University 64(3) 83-87 Dec 2014
To evaluate and improve the sustainability of Walleye Pollock fisheries for the Pacific stock according to the global standard, the fisheries is evaluated by MSC Fishery Standard which is a globally recognized requirements for an eco-label certifi...
Hashimoto O, Ohtsuki H, Kakizaki T, Amou K, Sato R, Doi S, Kobayashi S, Matsuda A, Sugiyama M, Funaba M, Matsuishi T, Terasawa F, Shindo J, Endo H
PLoS ONE 10(2) e0116734 Dec 2014 [Refereed]
Brown adipose tissue (BAT) plays an important role in thermoregulation in species living in cold environments, given heat can be generated from its chemical energy reserves. Here we investigate the existence of BAT in blubber in four species of de...
Maezawa T, Higashisaka H,Ishii M, Tashiro G, Kuroda M, Matsuda A, Matsuishi T
Japan Cetology (24) 27-32 Nov 2014 [Refereed]
A Spatial distribution of cetacean has been thought to be closely related to marine environment, such as sea surface temperature, chlorophyll-a concentration, sea floor gradient, and water depth which may affect an abundance of prey and in turn ma...
We analyzed d13C, d15N and d18O in the muscle and liver from killer whales stranded on the coast of Japan. The d15N values in the muscle samples from calves were apparently higher than those in their lactating mothers, suggesting that nursing may ...
Fisheries Science 80(3) 427-434 May 2014 [Refereed]
The catch forecast is important for fisheries activities. Previous research has tried to improve forecast accuracy. However the forecast accuracy does not directly correspond to the forecast benefit, and an inaccurate forecast could be more benefi...
Murase M, Tajima Y, Okamoto M, Matsuishi T, Yamada KT, Asakawa M
Journal of Rakuno Gakuen University 38(2) 149-152 Mar 2014 [Refereed]
Postmortem examination was performed on a female western gray whale (Eschrichtius robustus) stranded at Tomakomai-shi, Hokkaido, Japan in August, 2007, and amphipod whale lice (Cyamus scammoni) and cirripedian epizoites (Cryptolepas rachianecti) w...
Nomiyama K, Kanbara C, Ochiai M, Eguchi A, Mizukawa H, Isobe T, Matsuishi T, YamadaTK, Tanabe S
Marine Environmental Research 93 15-22 Feb 2014 [Refereed]
Information on accumulation of halogenated phenolic contaminants in the blood of marine mammal is limited. The present study, we determined the residue levels and patterns of chlorinated and brominated phenolic contaminants (OH-PCBs, OH-PBDEs and ...
Ichimori T, Suzuki S, Kojima S, Ishimori K, Sugitani M, Matsuda A, Ono Y,Matsuishi T
Japan Cetology (23) 29-33 Aug 2013 [Refereed]
The cetacean sighting records from 375 sighting survey in the Tsugaru Strait for ten years were compiled and the seasonal variability and yearly trend of cetacean encounter was examined. A total of 1876 school 19065 individuals were observed, and ...
Hossain MM, Perhar G, Arhonditsis GB, Matsuishi T, Goto A, Azuma M
Ecological Informatics 18 149-161 Aug 2013 [Refereed]
The introduction of largemouth bass (Micropterus salmoides) and bluegill sunfish (Lepomis macrochirus) into the freshwater ecosystems of Japan has resulted in the suppression and/or replacement of native species, generating considerable concerns...
Ochiai M, Nomiyama K, Isobe T, Mizukawa H, Yamada TK, Tajima Y, Matsuishi T, Amano M, Tanabe S
Chemosphere 92(7) 803-810 Aug 2013 [Refereed]
The present study investigated polychlorinated biphenyls (PCBs) and hydroxylated metabolites of PCBs (OH-PCBs) in blood from three porpoise species: finless porpoises (Neophocaena phocaenoides), harbor porpoises (Phocoena phocoena), and Dall’s por...
Shibata Y, Matsuishi T,Murase H, Matsuoka K. Hakamada T. Kitakado T, Matsuda H.
Fisheries Science 79(4) 559-568 Jun 2013 [Refereed]
The aim of this study was to examine theeffects of stratification of the survey region on the performanceof species distribution models (SDMs) described bygeneralized linear models or generalized additive modelswhen estimating school abundance by ...
International Journal of Biodiversity 2013(269141) 1-10 Feb 2013 [Refereed]
High biodiversity is the most remarkable characteristic of Lake Tanganyika including vertebrates, invertebrates, and plants. A few protected areas have been created along the lake to protect its biodiversity. However, limited studies have been car...
Dalls’s porpoise, Phocoenoides dalli stranded in Hokkaido were studied for their stomach contents. Seventeen individuals were reported from May to July in 2008. This is biggest number to have been reported within such a short period of time in the...
Ozaki K, Kuroda M, Tomiyasu M, Ito T, Iwai T, Takagi Y, Mizuno H, Morimitsu K, Iwahara Y, Matsuda A, Matsuishi T
Japan Cetology (22) 1-4 Aug 2012 [Refereed]
Pacific white-sided dolphin (PWS) Lagenorhynchus obliquidens is the most common cetacean species found in the Tsugaru Strait, Japan. It is suggested that PWS use this strait as a feeding ground and Japanese anchovy is one of the major prey species...
Accumulation of Halogenated Phenolic Compounds in Small Toothed Whales
Ochiai M, Nomiyama K, Isobe T, Yamada TK, Tajima Y, Matsuishi T, Amano M, Tanabe S
Interdisciplinary Studies on Environmental Chemistry-Environmental Pollution and Ecotoxicology 187-192 2012 [Refereed]
Proceedings of Interdisciplinary Studies on Environmental Chemistry Vol. 6 Environmental Pollution and Ecotoxicology, Eds., M. Kawaguchi, K. Misaki, H. Sato, T. Yokokawa, T. Itai, T. M. Nguyen, J. Ono and S. Tanabe
A comparative study on temporal trends of trace elements in harbor porpoise (Phocoena phocoena) from coastal waters of North Japan
Yasuda Y, Hirata S, Itai T, Isobe T, Matsuishi T, Yamada TK, Tajima Y,Takahashi S, Tanabe S
Interdisciplinary Studies on Environmental Chemistry-Environmental Pollution and Ecotoxicology 151-159 2012 [Refereed]
Proceedings of interdisciplinary studies on environmental chemistry Vol. 6 Environmental pollution and ecotoxicology, Eds., M. Kawaguchi, K. Misaki, H. Sato, T. Yokokawa, T. Itai, T. M. Nguyen, J. Ono and S. Tanabe
Accumulation of anthropogenic and natural origin organohalogen compounds in three porpoise species
Ochiai M, Nomiyama K, Isobe T, Yamada TK, Tajima Y, Matsuishi T, Amano M, Tanabe S
Organohalogen Compounds 73 1709-1712 Dec 2011 [Refereed]
Proceedings of the dioxin2011 in Brussels, Belgium
Contamination status of brominated flame retardants in Harbor (Phocoena phocoena) and Dall's (Phocoenoides dalli) porpoises from Hokkaido, Japan
Isobe T, Saito A, Matsuishi T, Yamada TK, Tajima Y, Tanabe S
Organohalogen Compounds 73 1721-1724 Dec 2011 [Refereed]
Proceedings of the dioxin2011 in Brussels, Belgium
Fisheries Science 77(4) 497-502 Aug 2011 [Refereed]
The yield-per-recruit (YPR) analysis has been used to assess growth overfishing of exploited fish stocks. Since the ex-vessel price per weight widely depends on the size of the fish, the result of the YPR does not imply the revenue. The value-per-...
Accumulation of brominated flame retardants in harbour and Dall's porpoises from Hokkaido
Saito A, Isobe T, Matsuishi T, Yamada TK, Tajima Y, Tanabe S
In the present study, stranded or by-caught Harbour porpoises (Phocoena phocoena) and Dall 's porpoises (Phocoenoides dalli) were collected from Hokkaido, Japan, and brominated flame retardants (PBDEs and HBCDs) and Polychlorinated bipl1enyls (PCB...
Inter-species differences of hydroxylated polychlorinated biphenyls (OH-PCBs) in the blood of small cetaceans
Ochiai M, Nomiyama K, Isobe T, Matsuishi T, Yamada TK, Tanabe S
The present study investigated the accumulation features and metabolic capacities of PCBs and OH-PCBs in the blood of harbor porpoises, Dall's porpoises and finless porpoises stranded or bycaught along the Japanese coastal waters. OH-PCBs concentr...
Genetic structure and phylogeography of the harbour porpoise Phocoena phocoena in the North Pacific were examined using 358 bps sequences from the 50 end of the mitochondrial DNA control region including those reported previously and newly obtaine...
Ono Y, Sahashi G, Nishizawa B, Yamada W, Shibata Y, Matsuishi T
Japan Cetology (20) 13-15 Jun 2010 [Refereed]
From the sighting survey in the TsugaruStrait, which is located betweenHokkaido and Honshu in northern Japan, it is known that Pacific white-sided dolphin (PWS) is the most common cetacean species in this strait, and is mostly observed from April ...
Little is known about the biology of harbour porpoises (Phocoena phocoena) around Japanese waters. This study estimates the seasonal distribution of harbour porpoises in Japan using 240 stranding and bycatch records from 1966 to August 2009 deposi...
Polychlorinated biphenyls (PCBs) and hydroxylated PCBs (OH-PCBs) in three porpoise species: accumulation features and metabolic capacity
Ochiai M, Nomiyama K, Isobe T, Matsuishi T, Yamada TK, Tanabe S
Organohalogen Compounds 72 1027-1030 Feb 2010 [Refereed]
The fishing practices in the oligotrophic Lake Toya, Hokkaido, Japan, have profound implications in the ecosystem sustainability. The status of the sockeye salmon (Oncorhynchus nerka) population has become a serious concern among the lake managers...
In spring, the Pacific white-sided dolphin (PWS) comes to the Tsugaru Strait and is observed mostly from April to June. In this study, we analyzed the data of sighting surveys conducted from ferry vessels between Hakodate and Aomori from May 2003 ...
Cohort analysis (also known as virtual population analysis) is a method of population reconstruction from age-specific harvest data. Because cohort analysis requires data over a whole life span to reconstruct a population for a single year, this m...
Elucidation of ecosystem attributes using ecopath with ecosim (EWE): Application to an oligotrophic lake in Hokkaido, Japan
Hossain MM, Matsuishi T, Arhonditsis G
Ecopath 25 Years 166-167 2009 [Refereed]
Proceedings of the symposium "Ecopath 25 years: conference and workshops", 30 August - 1 September, 2009, Vancouver, Canada
Fisheries Science 74(5) 955-969 Oct 2008 [Refereed]
To evaluate walleye pollock stock management procedures in the northern waters of the Sea of Japan, 30-year population dynamics, including uncertainties, were forecast. Errors in current stock size estimation, variability in future recruitment and...
As indices of protein synthetic activity, RNA:DNA ratios were determined for >80 copepod species caught from the epipelagic (0 to 500 m), mesopelagic (500 to 1000 m), upper bathypelagic (1000 to 2000 m), lower bathypelagic (2000 to 3000 m) and aby...
Fisheries Science 73(5) 1061-1069 Oct 2007 [Refereed]
Effects of sampling errors on abundance estimates from virtual population analysis (VPA) were quantified with the bootstrap method for stock of walleye pollock in the the Sea of Japan. In the bootstrap method, individual fish measurements were res...
ICES Journal of Marine Science 64(5) 870-877 May 2007 [Refereed]
Simulation studies are used widely for fish stock management. In such studies, forecasting future recruitment, which can vary greatly between years, has become an essential part of evaluating management strategies. We propose a new forecasting alg...
Deep-see Research I 53 1791-1809 Nov 2006 [Refereed]
Condition factor index [CFI=1000×DW/(PL)3; DW: dry weight, PL: prosome length], water content, carbon (C), nitrogen (N), ash and energy content were determined on a total of 69 copepod species caught from the mesopelagic (500-1000 m), upper-bathyp...
A histological examination was carried out on a young harbor porpoise, Phocoena phocoena (♀), 1.3m long, caught in a set net installed off Takashima, Otaru City, Hokkaido, facing the Sea of Japan. The formalin-preserved left lobe of the ovary was ...
Marine Ecology Progress Series 322 199-211 Sep 2006 [Refereed]
Respiration (= oxygen consumption) rates and electron transport system (ETS) enzyme activities in conjunction with body carbon and nitrogen composition (for respiration) or protein (for ETS) were determined for over 50 copepod species from the mes...
Fisheries resources are resource is a great natural asset to this planet and ensuring the responsible use of these resources can enrich the lives of its people. However, global fishery resources are under high and mounting pressure which is severe...
Fujinaga K, Ilano AS, Hayakari C, Oyama Y, Matsuishi T, Nakao S
Aquaculture Science 54(2) 179-185 Jun 2006 [Refereed]
along the coast of Hokkaido, Japan was examined based on RPSI, imposex frequency, and sex ratio. The extent of imposex was compared between species in shallow waters and deep waters. In whelks in shallow waters, imposex was observed, with low RPSI...
Ueda Y, Narimatsu Y, Hattori T, Ito M, Kitagawa D, Tomikawa N, Matsuishi T
Nippon Suisan Gakkaishi 72(2) 201-209 Mar 2006 [Refereed]
Fishing efficiency is one of the most important parameters to estimate population size using the swept area method based on bottom-trawl surveys. In the present study, the fishing efficiency of the stock of Pacific cod Gadus macrocephalus in the w...
Fisheries Research 77(3) 275-284 Mar 2006 [Refereed]
Despite the possession of a highly productive inland water area of about 45,000 km＾2, the continuing decrease in fish catch increasingly threatens the livelihoods of more than 12 million fishers in Bangladesh. The government’s open access and leas...
Matsuishi T, Muhoozi L, Mkumbo O, Budeba Y, Njiru M, Asila A, Othina A, Cowx IG
Fisheries Management and Ecology 13 53-71 Feb 2006 [Refereed]
Lake Victoria is one of the African Great Lakes, and an important source of affordable protein food in the form of fish. It provides employment, income, and export earnings to the riparian communities. Despite this importance there are major conce...
Nippon Suisan Gakkaishi 71(6) 935-941 Nov 2005 [Refereed]
The hair crab fishery in Funka Bay, Hokkaido, has adopted a total allowable catch system. In order to examine management policy, a length-based population analysis (LPA) including yield per recruit (YPR^L) was conducted on the hair crab in Funka B...
The ovaries (each 25mm in length) of a female harbor popoise, Phocoena phocoena, accidently caught in a set net on 26 April 2004, were examined histologically to assess their degree of maturity. The sectioned cortical region was occupied entirely ...
Fisheries Science 71(4) 799-804 Aug 2005 [Refereed]
The present study assessed the stock state of Pacific cod Gadus macrocephalus caught off the coast of southern Hokkaido, Japan. Weight-based yield per recruitment (YPR) and spawning-biomass per recruitment (SPR) analyses were used for this assessm...
Velocity control of harbor porpoise (Phocoena phocoena): a case study
Ito K, Matsuishi T, Ito A, Kojima Y, Miyashita A, Aoyama M
Studies in perception and action 8 77-81 Jun 2005 [Refereed]
Proceedings of 13th International conference on perception and action/ ed. by H. Heft and K. L. Marsh
The genetic impact of stocking on natural populations was assessed by using individual- based life history models. Models were constructed that included density-dependent mortality at the early life stage, natural mortality, fishing mortality, and...
Fisheries Science 70(5) 829-838 Oct 2004 [Refereed]
Age-based population assessment is widely used, but there are cases where information on age or even body length of landed fish is difficult to collect. In the present study, the biomass and fishing mortality of the southern Hokkaido stock of Paci...
Bulletin of Fisheries Sciences, Hokkaido University 55(1) 7-10 Aug 2004
The surfacings of minke whales were collected through direct observation from JARPA (Japanese Whale Research Program under special permit in the Antarctic) and analyzed to see the distribution and average of the surfacing interval. The distributio...
Honma Y, Ushiki T, Hashizume H, Takeda M, Matsuishi T, Honno Y
Fisheries Science 70(1) 94-99 Feb 2004 [Refereed]
A histological examination of two harbor porpoises Phocoena phocoena caught in a set net established off Usujiri, Hokkaido was conducted in order to further understand the reproductive biology of the species. In the male, a unilateral testis compr...
For a fish to pass through the mesh of a net, the mesh perimeter must be at least equal to the fish's maximum girth. Assuming the maximum girth as the circumference of an ellipse calculated from the maximum body depth (D_m) and maximum body width ...
Behavior of a harbor porpoise in an unfamiliar environment
Honno Y, Ito K, Matsuishi T, Okura M, Sasaki M
Studies in perception and action 7 191-194 Jun 2003 [Refereed]
Proceedings of 12th International conference on perception and action
Journal of Plankton Research 25(3) 261-271 Mar 2003 [Refereed]
Post-embryonic development time, somatic growth, egg production rate, survival and sex ratio for the marine calanoid copepod Pseudocalanus newmani from the Pacific coast off southwestern Hokkaido were determined at five temperatures (3, 6, 10, 15 ...
Fisheries Science 68(6) 1205-1211 Dec 2002 [Refereed]
We carried out mail and access point surveys to estimate the catch numbers, angling effort of recreational angling and the population of sockeye salmon Oncorhynchus nerka in Lake Toya in 1998 and 1999. The mail survey questions in questionnaires d...
Nippon Suisan Gakkaishi 68(6) 881-886 Nov 2002 [Refereed]
In order to investigate the relationship between the girth of fish and the appropriate mesh size when the fish body passes through the mesh in case of wedged capture, a new device for measuring the maximum girth was developed. This device is capab...
Nippon Suisan Gakkaishi 68(2) 180-185 Mar 2002 [Refereed]
We examined the effects of catch-and-release angling on the growth, survival and catchability of white-spotted charr Salvelinus leucomaenis in four wild streams in northern Japan. Investigations were made twice at each stream. We angled fish with ...
Sighting surveys of cetaceans were conducted in tropical waters of the western and central North Pacific during January and February 1993. In total, 51 schools and 1915 individuals were sighted, including humpback whales, Bryde's whales, sperm wha...
Crabs in Cold Water Regions: Biology, Management, and Economics 495-509 2002 [Refereed]
Proceedings of the symposium "Crabs 2001, Crabs in Cold Water Regions", 17-20 January 2001, Anchorage, Alaska, eds. Paul AJ, Dawe EG, Elner R, Jamieson GS, Kruse GH, Otto RS, Sainte-Marie B, Shirley TC, Woodby D, University of Alaska Sea Grant Col...
Journal of the Fisheries Society of Taiwan 28(3) 203-207 Sep 2001 [Refereed]
The otolith is an important part of the sensory organ of fish in detecting their direction and keeping balance through the movement of the otolith when swimming. The size of the otolith tends to vary according to the swimming speed of different fi...
Canadian Journal of Fish and Aquatic Science 58(9) 1805-1811 Sep 2001 [Refereed]
We developed a simple back-calculation model that includes the age effect in which otolith size increases continuously during no-growth periods. To evaluate the validity of our proposed model, we back-calculated the past fish lengths and growth ra...
Fisheries Research 50(3) 271-278 Mar 2001 [Refereed]
Generally, the individual weight of large fish is measured at landing, and thus, their weight composition is easily obtained. In this paper, we develop a method of population analysis using weight composition of fish, called weight-based populatio...
Nippon Suisan Gakkaishi 67(1) 67-77 Jan 2001 [Refereed]
Density of the fish shoal and vertebral counts of Pacific cod at various locations in the Sea of Japan and in the Pacific Ocean off the Tohoku District, and in the Pacific Ocean off Hokkaido were studied. Off the Pacific coast, there were three hi...
A length-based population analysis (LPA) was applied to the Eastern Hokkaido hair crab Erimacrus isenbeckii, incorporating stochastic growth and gradual recruitment over length. A nonlinear least squares approach was used to estimate growth, proba...
Mitochondrial DNA (mtDNA) of masu salmon among eight populations from six rivers around Hokkaido island were examined to clarify their genetic features and population structure. Restriction fragment length polymorphism (RFLP) analysis using 10 res...
Fisheries Science 66(3) 515-520 Jun 2000 [Refereed]
The ages of individual specimens of white-spotted char Salvelinus leucomaenis, collected from the Furuu River in Hokkaido, Japan, were determined from otoliths using NIH Image. We employed two methods to determine age. First, for a surface method ...
