A5103080964- Reproductive biology and impacts on aquatic species
- Aquaculture Nutrition and Growth
- Fish Ecology and Management Studies
- Genetic and Clinical Aspects of Sex Determination and Chromosomal Abnormalities
- Fish Biology and Ecology Studies
- Marine and fisheries research
- Effects and risks of endocrine disrupting chemicals
- Environmental Toxicology and Ecotoxicology
- Animal Behavior and Reproduction
- Fish biology, ecology, and behavior
- Animal Genetics and Reproduction
- Pharmaceutical and Antibiotic Environmental Impacts
- Marine Biology and Environmental Chemistry
- Cephalopods and Marine Biology
- Aquaculture disease management and microbiota
- Coral and Marine Ecosystems Studies
- Mosquito-borne diseases and control
- Marine Bivalve and Aquaculture Studies
- Marine Toxins and Detection Methods
- Ichthyology and Marine Biology
- Sperm and Testicular Function
- Neuroendocrine regulation and behavior
- Aquatic life and conservation
- Insect and Pesticide Research
- Toxic Organic Pollutants Impact
Nagasaki University
2015-2024
Graduate School USA
2004
AB Aquatic Biology Contact the journal Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 18:281-292 (2013) - DOI: https://doi.org/10.3354/ab00510 Effect of ocean acidification on growth, gonad development and physiology sea urchin Hemicentrotus pulcherrimus Haruko Kurihara1,*, Rui Yin2, Gregory N. Nishihara2, Kiyoshi Soyano2, Atsushi Ishimatsu2 1Transdisciplinary Research Organization for Subtropical Island Studies,...
Fishes exhibit remarkably diverse, and plastic, patterns of sexual development, most striking which is sequential hermaphroditism, where individuals readily reverse sex in adulthood. How this stunning example phenotypic plasticity controlled at a genetic level remains poorly understood. Several genes have been implicated regulating change, yet the degree to conserved machinery orchestrates process has not addressed. Using captive in-the-field social manipulations initiate combined with...
Circulating estradiol–17β (E2) levels decrease precipitously during female to male (protogynous) sex change in fish. Whether this drop E2 is a cause or consequence of still largely unknown. The present study treated adult honeycomb groupers (Epinephelus merra) with aromatase inhibitor (AI, Fadrozole), either alone combination E2, investigate the role estrogen protogynous change. Control fish had ovaries undergoing active vitellogenesis; gonads AI-treated already developed into testes, which...
The honeycomb grouper, Epinephelus merra, is a protogynous hermaphrodite fish. Sex steroid hormones play key roles in sex change of this species. A significant drop endogenous estradiol-17beta (E2) levels alone triggers female-to-male change, and the subsequent elevation 11-ketotestosterone (11KT) correlates with progression spermatogenesis. To elucidate role an androgen we attempted to induce by exogenous 11KT treatments. 75-day treatment caused 100% masculinization pre-spawning females....
Abstract We examined whether we could identify the feeding behaviours of trophic generalist fish Epinephelus ongus on different prey types (crabs and fish) using a data-logger that incorporated 3-axis gyroscope accelerometer. Feeding other burst behaviours, including escape responses, intraspecific interactions, routine movements, were recorded from six E. individuals data-loggers sampling at 200 Hz, validated by simultaneously video images. For each record, extracted 5 seconds data when any...
11-ketotestosterone (11-KT), a potent male-specific androgen in fish, has important roles on spermatogenesis, male behavior, and nuptial coloration. The site of 11-KT synthesis its role germ cell development during protogynous sex change is not clearly understood. We examined the dynamics steroidogenic enzymes immunolocalization, viz cholesterol side-chain cleavage (P450scc), biomarker steroids cytochrome P45011beta-hydroxylase (P45011beta), downstream to production, throughout process...
To understand the mechanism of sex differentiation in protogynous Malabar grouper <I>Epinephelus malabaricus</I>, we performed an immunohistochemical investigation expression three steroidogenic enzymes, cholesterol-side-chain-cleavage enzyme (CYP11a), aromatase (CYP19a1a), and cytochrome P45011beta-hydroxylase (CYP11b), gonads during ovarian differentiation. Strong positive immunoreactivity against CYP11a, key steroidogenesis, CYP19a1a which is essential for estrogen (17beta-estradiol)...