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Article
Open AccessGender identification of the horsehair crab, Erimacrus isenbeckii (Brandt, 1848), by image recognition with a deep neural network
Appearance-based gender identification of the horsehair crab [Erimacrus isenbeckii (Brandt, 1848)] is important for preventing indiscriminate fishing of female crabs. Although their gender is easily identified by...
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Article
Open AccessThe role of mesenchymal estrogen receptor 1 in mouse uterus in response to estrogen
Estrogens play important roles in uterine growth and homeostasis through estrogen receptors (ESR1 and ESR2). To address the role of ESR1-mediated tissue events in the murine uterus, we analyzed mice with a mes...
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Article
Open AccessKynurenine promotes Calcitonin secretion and reduces cortisol in the Japanese flounder Paralichthys olivaceus
Deep ocean water (DOW) exerts positive effects on the growth of marine organisms, suggesting the presence of unknown component(s) that facilitate their aquaculture. We observed that DOW suppressed plasma corti...
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Article
Open AccessDeep ocean water alters the cholesterol and mineral metabolism of squid Todarodes pacificus and suppresses its weight loss
This study is the first to demonstrate that deep ocean water (DOW) has physiological significant effects on squid. After 36 h of rearing squids, those reared with DOW had significantly higher total and free ch...
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Article
Open AccessEyestalk transcriptome and methyl farnesoate titers provide insight into the physiological changes in the male snow crab, Chionoecetes opilio, after its terminal molt
The snow crab, Chionoecetes opilio, is a giant deep-sea brachyuran. While several decapod crustaceans generally continue to molt and grow throughout their lifetime, the snow crab has a fixed number of molts. Adol...
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Article
Open AccessAdaptation to the shallow sea floor environment of a species of marine worms, Oligobrachia mashikoi, generally inhabiting deep-sea water
Beard worms from the family Siboglinidae, are peculiar animals and are known for their symbiotic relationships with sulfur bacteria. Most Siboglinids inhabit the deep-sea floor, thus making difficult to make a...
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Article
Annual reproductive cycle of the greasyback shrimp Metapenaeus ensis in Ise Bay, Japan
The greasyback shrimp Metapenaeus ensis is widely distributed along the coast of India and the West Pacific where it is an important fisheries species. We have examined seasonal changes in ovarian development, sp...
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Article
Open AccessTransgenerational response to early spring warming in Daphnia
Temperature and photoperiod regulate key fitness traits in plants and animals. However, with temperature increase due to global warming, temperature cue thresholds are experienced at shorter photoperiods, disr...
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Environmental Control of Sex Differentiation in Daphnia
The cladoceran crustacean genus Daphnia (daphnids) exhibits a unique reproductive strategy in response to changes in environmental conditions of their habitat. This is known as environmental sex determination (ES...
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Article
Open AccessMetabolomics reveals an involvement of pantothenate for male production responding to the short-day stimulus in the water flea, Daphnia pulex
Under favorable conditions, the micro-crustacean Daphnia pulex produces female offspring by parthenogenesis, whereas under unfavorable conditions, they produce male offspring to induce sexual reproduction (enviro...
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Article
Open AccessNMDA receptor activation upstream of methyl farnesoate signaling for short day-induced male offspring production in the water flea, Daphnia pulex
The cladoceran crustacean Daphnia pulex produces female offspring by parthenogenesis under favorable conditions, but in response to various unfavorable external stimuli, it produces male offspring (environmental ...
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Article
Open AccessTargeted gene disruption by use of transcription activator-like effector nuclease (TALEN) in the water flea Daphnia pulex
The cosmopolitan microcrustacean Daphnia pulex provides a model system for both human health research and monitoring ecosystem integrity. It is the first crustacean to have its complete genome sequenced, an unpre...
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Article
Open AccessRoles of ecdysteroids for progression of reproductive cycle in the fresh water crustacean Daphnia magna
Daphnia magna exhibits a parthenogenetic reproductive cycle linked to a moulting cycle, but regulatory mechanisms of neither moulting nor reproductive cycle are understood in daphnids. Moulting is regulated by ec...
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Article
Open AccessDevelopment of a microinjection system for RNA interference in the water flea Daphnia pulex
The ubiquitous, freshwater microcrustacean Daphnia pulex provides a model system for both human health research and monitoring ecosystem integrity. It is the first crustacean to have a well annotated, reference g...
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Article
A mutation in the receptor Methoprene-tolerant alters juvenile hormone response in insects and crustaceans
Juvenile hormone is an essential regulator of major developmental and life history events in arthropods. Most of the insects use juvenile hormone III as the innate juvenile hormone ligand. By contrast, crustac...
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Article
Open AccessMolecular cloning of doublesex genes of four cladocera (water flea) species
The gene doublesex (dsx) is known as a key factor regulating genetic sex determination in many organisms. We previously identified two dsx genes (DapmaDsx1 and DapmaDsx2) from a freshwater branchiopod crustacean,...
