Seinen Chow
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View article: The First Larval Description of the Common Aesop Slipper Lobster <i>Scyllarides haanii</i> (Decapoda: Achelata: Scyllaridae)
The First Larval Description of the Common Aesop Slipper Lobster <i>Scyllarides haanii</i> (Decapoda: Achelata: Scyllaridae) Open
A late-stage phyllosoma, collected from the North Pacific Ocean, was identified as Scyllarides haanii (De Haan, 1841) by DNA analysis. A morphological description of the phyllosoma of this common Indo-Pacific species is given for the first…
View article: Re-evaluation of nuclear mitochondrial pseudogenes (NUMTs) and heteroplasmy in the Japanese spiny lobster <i>Panulirus japonicus</i>
Re-evaluation of nuclear mitochondrial pseudogenes (NUMTs) and heteroplasmy in the Japanese spiny lobster <i>Panulirus japonicus</i> Open
The Japanese spiny lobster Panulirus japonicus has been reported to harbor a numbers of nuclear mitochondrial pseudogenes (NUMTs) and heteroplasmy. However, distinguishing phylogenetically young NUMTs, heteroplasmy, and PCR-cloning artefac…
View article: Variation of length and sequence of the nuclear ribosomal DNA internal transcribed spacer 1 supports “hermit-to-king” crab hypothesis
Variation of length and sequence of the nuclear ribosomal DNA internal transcribed spacer 1 supports “hermit-to-king” crab hypothesis Open
Lithodoid and paguroid crabs are morphologically assigned to the superfamilies Lithodoidea and Paguroidea, respectively. Molecular analyses, however, have revealed closer genetic proximity of the lithodoid crabs to the family Paguridae tha…
View article: Genetic and morphological differentiation among local populations of Japanese top shell <i>Turbo sazae</i>
Genetic and morphological differentiation among local populations of Japanese top shell <i>Turbo sazae</i> Open
日本におけるサザエの分布範囲を網羅する11地域から標本を収集しミトコンドリア16S rDNAとCOI塩基配列及び殻の棘タイプを分析した。塩基配列は2つのハプログループに分けられ,ハプログループ間の平均塩基置換率は16S rDNAで1.247%,COIで1.429%であった。日本海-東シナ海と太平洋の集団間でその頻度が大きく異なっていた。また各海域内地域集団間にも有意な遺伝的分化が検出された。ごく近隣の地域間でも棘の有無や大小に大きな変異がみられ,環境要因の影響が示唆された。
View article: First Description of Phyllosoma Larva in the Genus <i>Projasus</i> (Crustacea: Decapoda: Palinuridae)
First Description of Phyllosoma Larva in the Genus <i>Projasus</i> (Crustacea: Decapoda: Palinuridae) Open
Konishi, Kooichi, Yanagimoto, Takashi, Chow, Seinen (2022): First Description of Phyllosoma Larva in the Genus Projasus (Crustacea: Decapoda: Palinuridae). Species Diversity 27 (2): 243-249, DOI: 10.12782/specdiv.27.243, URL: http://dx.doi…
View article: Variation of length and sequence of the nuclear ribosomal DNA internal transcribed spacer 1 supports “hermit-to-king” crab hypothesis
Variation of length and sequence of the nuclear ribosomal DNA internal transcribed spacer 1 supports “hermit-to-king” crab hypothesis Open
Lithodoid and paguroid crabs are morphologically assigned to the superfamilies Lithodoidea and Paguroidea, respectively. Molecular analyses, however, have revealed closer genetic proximity of the lithodoid crabs to the family Paguridae tha…
View article: Author Correction: Detection of heteroplasmy and nuclear mitochondrial pseudogenes in the Japanese spiny lobster Panulirus japonicus
Author Correction: Detection of heteroplasmy and nuclear mitochondrial pseudogenes in the Japanese spiny lobster Panulirus japonicus Open
View article: Active swimming and transport by currents observed in Japanese eels (Anguilla japonica) acoustically tracked in the western North Pacific
Active swimming and transport by currents observed in Japanese eels (Anguilla japonica) acoustically tracked in the western North Pacific Open
The mechanisms of oceanic animal migration remain enigmatic. Adult Japanese eels start their long-distance oceanic migration from coastal areas to breed near the West Mariana Ridge. We tracked acoustically tagged eels released in the Kuros…
View article: Detection of heteroplasmy and nuclear mitochondrial pseudogenes in the Japanese spiny lobster Panulirus japonicus
Detection of heteroplasmy and nuclear mitochondrial pseudogenes in the Japanese spiny lobster Panulirus japonicus Open
Partial mtDNA cytochrome oxidase subunit I (COI) fragments and near entire stretch of 12S rDNA (12S) and control region (Dloop) of the Japanese spiny lobster ( Panulirus japonicus ) (n = 3) were amplified by PCR and used for direct nucleot…
View article: Temporal variation in growth of yellowfin tuna (Thunnus albacares) larvae in the Panama Bight, 1990
Temporal variation in growth of yellowfin tuna (Thunnus albacares) larvae in the Panama Bight, 1990 Open
Tuna larvae (at flexion, postflexion, and transformationstages) were collected by dip net and light traps at night in the northwestern Panama Bight during the season ofreduced upwelling (June−September) of 1990, 1991, 1992, and 1997. The l…
View article: 18S rRNA gene sequences of leptocephalus gut contents, particulate organic matter, and biological oceanographic conditions in the western North Pacific
18S rRNA gene sequences of leptocephalus gut contents, particulate organic matter, and biological oceanographic conditions in the western North Pacific Open
Eel larvae apparently feed on marine snow, but many aspects of their feeding ecology remain unknown. The eukaryotic 18S rRNA gene sequence compositions in the gut contents of four taxa of anguilliform eel larvae were compared with the sequ…
View article: Histological Evidence of Multiple Spawning in Wild Female Japanese Eel <i>Anguilla japonica</i>.
Histological Evidence of Multiple Spawning in Wild Female Japanese Eel <i>Anguilla japonica</i>. Open
The post ovulatory follicle (POF) is an important and reliable tissue structure used to investigate the spawning history in teleost fish. Fresh POFs shortly after spawning are comprised of cellular (follicular cells) and acellular (basemen…
View article: Molecular Identification of Mid to Final Stage Slipper Lobster Phyllosoma Larvae of the Genus <i>Chelarctus</i> (Crustacea: Decapoda: Scyllaridae) Collected in the Pacific with Descriptions of Their Larval Morphology.
Molecular Identification of Mid to Final Stage Slipper Lobster Phyllosoma Larvae of the Genus <i>Chelarctus</i> (Crustacea: Decapoda: Scyllaridae) Collected in the Pacific with Descriptions of Their Larval Morphology. Open
Morphological descriptions of phyllosoma larvae are essential for correct species identification and investigating the spatiotemporal distribution and recruitment process of spiny and slipper lobsters. Species identification of the phyllos…
View article: Evaluation from otolith Sr stable isotope ratios of possible juvenile growth areas of Japanese eels collected from the West Mariana Ridge spawning area
Evaluation from otolith Sr stable isotope ratios of possible juvenile growth areas of Japanese eels collected from the West Mariana Ridge spawning area Open
View article: Erratum: A biochemical investigation on the natural diets of the long spined-sea urchin <i>Diadema setosum</i>
Erratum: A biochemical investigation on the natural diets of the long spined-sea urchin <i>Diadema setosum</i> Open
日本水産学会誌第86号1号（January 2020）9-19頁「生化学的アプローチによるガンガゼDiadema setosumの天然餌料の検討」（DOI: 10.2331/suisan.19-00015）に誤りがありましたので，訂正いたします。
View article: A biochemical investigation on the natural diets of the long spined-sea urchin <i>Diadema setosum</i>
A biochemical investigation on the natural diets of the long spined-sea urchin <i>Diadema setosum</i> Open
神奈川県横須賀市長井地先で採集したガンガゼ（殻径47.3±2.4 mm，体重48.5±1.9 gWW, n=9）に生息場所の優占海藻である褐藻カジメを与えて1年間飼育し，平均摂餌速度を求めるとともに，海藻の消化に関わる酵素活性及び炭素窒素安定同位体比を飼育個体と天然個体で比較した。飼育個体のカジメ摂餌量は夏季に最大となり，年間平均摂餌速度は0.69 gWW day−1だった。飼育終了時でのガンガゼの消化酵素活性は天然個体のものよりも有意に高く，窒素安定同位体比は有意に高かっ…
View article: Molecular diet analysis of Anguilliformes leptocephalus larvae collected in the western North Pacific
Molecular diet analysis of Anguilliformes leptocephalus larvae collected in the western North Pacific Open
Natural diets of leptocephalus larvae have been enigmatic. In this study, we collected DNA samples from the gut contents and body surface of leptocephali belonging to the five Anguilliform families (Anguillidae, Chlopsidae, Congridae, Mura…
View article: Morphological differences among phyllosoma larvae of the pronghorn spiny lobster, <i>Panulirus penicillatus</i>, from the western, central, and eastern areas of the Pacific Ocean
Morphological differences among phyllosoma larvae of the pronghorn spiny lobster, <i>Panulirus penicillatus</i>, from the western, central, and eastern areas of the Pacific Ocean Open
The pronghorn spiny lobster, Panulirus penicillatus, is known to have the widest distribution among palinurid lobster species, occurring in tropical and sub-tropical areas of the Indo-Pacific Ocean. In the Pacific Ocean, mitochondrial DNA …
View article: A method to separate eel leptocephalus larvae from turbid water by controlling the light environment
A method to separate eel leptocephalus larvae from turbid water by controlling the light environment Open
ウナギの完全養殖は達成されたが,飼育環境の水質維持のために頻繁な水槽の交換や洗浄が必要であり,人的にも仔魚にとっても大きなストレスとなっている。本研究ではパイプで連結したかけ流し式の水槽システム案を紹介する。パイプの断面積が約12 cm2以下,パイプ内の流速が約1 mm s−1以上という条件により,下流水槽の懸濁水が上流水槽へ漏洩することを防止できた。一方,照明をコントロールすることにより,仔魚を下流水槽から上流水槽へと能動的に移動させることができ,餌で汚れた飼育水から分離…
View article: Morphological differences between phyllosoma larvae from the western–central and eastern Pacific populations of the pronghorn spiny lobster <i>Panulirus penicillatus</i>
Morphological differences between phyllosoma larvae from the western–central and eastern Pacific populations of the pronghorn spiny lobster <i>Panulirus penicillatus</i> Open
The pronghorn spiny lobster Panulirus penicillatus is known to have the widest distribution among palinurid lobster species, occurring in tropical and sub-tropical areas of the Indo-Pacific Ocean. In the Pacific Ocean, mitochondrial DNA an…
View article: Evaluation from otolith Sr stable isotope ratios of possible juvenile growth areas of Japanese eels collected from the West Mariana Ridge spawning area
Evaluation from otolith Sr stable isotope ratios of possible juvenile growth areas of Japanese eels collected from the West Mariana Ridge spawning area Open
The widely distributed East Asian Japanese eel Anguilla japonica constitutes a single genetically homogeneous population with a single spawning area near the West Mariana Ridge. Otolith 87Sr/86Sr ratios of adults (categorized as “river“, “…
View article: Enrichment of bacteria and alginate lyase genes potentially involved in brown alga degradation in the gut of marine gastropods
Enrichment of bacteria and alginate lyase genes potentially involved in brown alga degradation in the gut of marine gastropods Open
Gut bacteria of phytophagous and omnivorous marine invertebrates often possess alginate lyases (ALGs), which are key enzymes for utilizing macroalgae as carbon neutral biomass. We hypothesized that the exclusive feeding of a target alga to…
View article: Whole-Genome Sequencing of 84 Japanese Eels Reveals Evidence against Panmixia and Support for Sympatric Speciation
Whole-Genome Sequencing of 84 Japanese Eels Reveals Evidence against Panmixia and Support for Sympatric Speciation Open
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…
View article: A DNA marker to discriminate two types of freshwater shrimp <i>Palaemon paucidens</i> and the distribution of these two types in Japan
A DNA marker to discriminate two types of freshwater shrimp <i>Palaemon paucidens</i> and the distribution of these two types in Japan Open
スジエビには遺伝的に異なる2タイプ（AとB）が知られているが，簡便に判別できるマーカーがない。18S rDNAの塩基配列に基づき，これら2タイプを判別するマルチプレックスPCRアッセイを考案した。日本における本種の分布範囲を網羅する152地点で採集した422個体を分析したところ，各タイプ特有の断片を併せ持つ個体，すなわちヘテロ型は観察されず，AとBタイプは生殖隔離しているものと考えられた。両タイプとも全国的に分布するがAタイプは河川及び湖沼に分布する一方，Bタイプは河川のみ…
View article: Observations of gut contents of anguilliform leptocephali collected in the western North Pacific
Observations of gut contents of anguilliform leptocephali collected in the western North Pacific Open
ウナギ目葉形仔魚(レプトセファルス)の餌料源を探索するため,西部北太平洋で採集した仔魚26個体の消化管内容物を観察した。いずれの消化管内容物とも,粒径2-10 μmのピコ・ナノプランクトン様の微粒子を多く含み,Alcian Blue染色される多糖類やCoomassie Brilliant Blue染色されるタンパク質で構成された無定形の凝集物であった。本調査結果は,レプトセファルスが外洋に広く存在する植物プランクトン由来のPOMを餌料源のひとつとして利用していることを示唆し…
View article: Rhodopsin gene copies in Japanese eel originated in a teleost-specific genome duplication
Rhodopsin gene copies in Japanese eel originated in a teleost-specific genome duplication Open
View article: Locus-specific EPIC-PCR primers for four distinct calmodulin genes of the Pacific bluefin tuna Thunnus orientalis (Temminck & Schlegel, 1844)
Locus-specific EPIC-PCR primers for four distinct calmodulin genes of the Pacific bluefin tuna Thunnus orientalis (Temminck & Schlegel, 1844) Open
Nucleotide sequences of four distinct calmodulin genes (designated as CaM-A to -D) of the Pacific bluefin tuna (Thunnus orientalis) were compared. Nucleotide sequence divergence between the coding regions of four genes ranged from 16.0 to …
View article: Additional file 1: Table S1. of Rhodopsin gene copies in Japanese eel originated in a teleost-specific genome duplication
Additional file 1: Table S1. of Rhodopsin gene copies in Japanese eel originated in a teleost-specific genome duplication Open
Sequencing results of the Japanese eel genome and cDNA. (XLS 32 kb)
View article: Additional file 8: Table S5. of Rhodopsin gene copies in Japanese eel originated in a teleost-specific genome duplication
Additional file 8: Table S5. of Rhodopsin gene copies in Japanese eel originated in a teleost-specific genome duplication Open
Substitution models employed in ML phylogenetic tree search. (XLS 28 kb)
View article: Additional file 3: Table S2. of Rhodopsin gene copies in Japanese eel originated in a teleost-specific genome duplication
Additional file 3: Table S2. of Rhodopsin gene copies in Japanese eel originated in a teleost-specific genome duplication Open
LG mapping of the Japanese eel scaffolds. (XLS 335 kb)