A5005058501- Reproductive biology and impacts on aquatic species
- Aquaculture Nutrition and Growth
- Regulation of Appetite and Obesity
- Aquaculture disease management and microbiota
- Genetic and Clinical Aspects of Sex Determination and Chromosomal Abnormalities
- Hypothalamic control of reproductive hormones
- Biochemical Analysis and Sensing Techniques
- Fish Ecology and Management Studies
- Physiological and biochemical adaptations
- Sperm and Testicular Function
- melanin and skin pigmentation
- Fish Biology and Ecology Studies
- Growth Hormone and Insulin-like Growth Factors
- Ovarian function and disorders
- Spaceflight effects on biology
- Adipose Tissue and Metabolism
- Reproductive Biology and Fertility
- Animal Behavior and Reproduction
- Neuroendocrine regulation and behavior
- Marine and fisheries research
- Marine Bivalve and Aquaculture Studies
- Aquatic Invertebrate Ecology and Behavior
- Stress Responses and Cortisol
- Lipid metabolism and disorders
- Pregnancy and preeclampsia studies
Kitasato University
2008-2022
Hagfish, which lack both jaws and vertebrae, are considered the most primitive vertebrate known, living or extinct. Hagfish have long been enigma of evolution not only because their evolutionary position, but also our knowledge on fundamental processes. Key elements reproductive endocrine system in hagfish yet to be elucidated. Here, presence identity a functional glycoprotein hormone (GPH) elucidated from brown Paramyxine atami. The GPH consists two subunits, alpha beta, synthesized...
Circadian changes in serum concentrations of testosterone (T), 11-ketotestosterone (11KT), estradiol-17β (E2), 17α,20β-dihydroxy-4-pregnen-3-one (DHP), 17α-hydroxyprogesterone (OHP), cortisol (F) and progesterone (P) were investigated the spermiated/ovulated Japanese char Salvelinus leucomaenis for over three days using newly developed time-resolved fluoroimmunoassays. Testosterone DHP both sex 11KT male showed significantly (P<0.05) higher levels just before/after onset darkness (15:00 or...
Reproductive homing migration of salmonids requires accurate interaction between the reception external olfactory cues for navigation to spawning grounds and regulation sexual maturation processes. This study aimed at providing insights into hypothesized functional link sensing ground final maturation. We have therefore assessed presence expression levels genes by RNA sequencing (RNAseq) rosettes in chum salmon Oncorhynchus keta Walbaum from coastal sea 75 km upstream rivers pre-spawning...
The life history and reproductive ecology of an autumn-spawning bitterling Acheilognathus typus were studied under natural experimental conditions. In the study pond, embryos A. emerged from mussels in May grew rapidly until August, whereas overwintered age-1 fish slowly. Adult pond was smaller (32-47 mm standard length) than they other habitats mainly spawned mussels. number negatively correlated with shell length mussel, a lower observed larger (over 110 length). mussel size-choice...
Abstract Changes in serum concentrations of estradiol‐17β, testosterone, 17α,20βdihydroxy‐4‐pregnen‐3‐one, and vitellogenin were investigated during ovarian development induced by injection a salmon pituitary extract cultured European eel Anguilla anguilla . Vitellogenesis was with weekly dose 50 mg extract/kg body weight. In eels receiving that dose, gonadsomatic indices ranged from 20–43% after the 10th–11th injection. Body weights relatively stable vitellogenesis, but increased...