A5075002023- Physiological and biochemical adaptations
- Aquaculture Nutrition and Growth
- Fish Ecology and Management Studies
- Ocean Acidification Effects and Responses
- Aquaculture disease management and microbiota
- Amphibian and Reptile Biology
- Marine animal studies overview
- Species Distribution and Climate Change
- Marine Bivalve and Aquaculture Studies
- Animal Behavior and Reproduction
- Nanoparticles: synthesis and applications
- Plant and animal studies
- Olfactory and Sensory Function Studies
- Water Quality Monitoring Technologies
- Reproductive biology and impacts on aquatic species
- Microplastics and Plastic Pollution
- Neurobiology and Insect Physiology Research
- Recycling and Waste Management Techniques
- Neuroendocrine regulation and behavior
- Ecology and Conservation Studies
- Pharmaceutical and Antibiotic Environmental Impacts
- Rangeland and Wildlife Management
- Turtle Biology and Conservation
- Insect and Arachnid Ecology and Behavior
- Neuroscience of respiration and sleep
University of British Columbia
2014-2025
Bamfield Marine Sciences Centre
2018-2022
Kangwon National University
2008-2013
The contribution of the gut to ingestion, production, absorption, and excretion extra ammonia urea-N associated with feeding (“exogenous” fraction) has received limited prior attention. Analysis commercial pellet food revealed appreciable concentrations urea-N. Long term satiation-feeding increased whole trout rates by 2.5-fold above fasting levels. Blood was sampled from dorsal aorta, posterior, mid, anterior sub-intestinal veins, as well hepatic portal vein in situ. Ammonia, urea-N, fluid...
Because of their complex life styles, amphibians and reptiles living in wetlands require both aquatic terrestrial buffer zones protected conservation areas. Due to steep declines wild populations, the gold-spotted pond frog (Rana chosenica) is listed as vulnerable by IUCN. However, lack data about its movements use habitat prevents effective planning. To determine home range this species, we radio-tracked 44 adult frogs for 37 days between 10 July 4 Nov. 2007 observe three different...
To test the hypothesis that male Korean salamanders, Hynobius leechii, respond to water vibrations via mechanosensory lateral line system, we conducted a series of experiments. First, examined behavioral responses males 0, 0.5, 1.0, and 1.5 Hz generated by model salamander, measured number times (1) oriented their heads toward vibrating model; (2) approached within 15-cm–diameter circle centered on cloaca (3) touched model, as well (4) length time stayed circle. determine whether system...
We made anatomical and physiological observations of the breathing mechanisms in Pacific hagfish Eptatretus stoutii, with measurements nostril flow pressure, mouth pharyngo-cutaneous duct (PCD) pressure velum heart impedance dye patterns. Resting animals frequently exhibit spontaneous apnea. During normal breathing, water is continuous at a high rate (~125 ml kg-1 min-1 12°C) powered by two-phase unidirectional pumping system fast suction pump (the velum, ~22 ) for inhalation through single...
Our goal was to use novel fibreoptic sensors make the first direct PCO2 measurements in digestive tracts of live freshwater fish (anaesthetized, artificially ventilated, 12°C). levels gastrointestinal fluids were substantially higher than blood, and elevated after feeding. In carnivorous, gastric rainbow trout, mean various parts tract increased from 7-13 torr (1 = 0.1333 kPa) during fasting 20-41 feeding, relative arterial 3.5-4 torr. agastric, omnivorous goldfish, gut varied 10-13 fasted...
Ventilatory sensitivity to ammonia occurs in teleosts, elasmobranchs, and mammals. Here we investigated whether the response is present hagfish. parameters (nostril flow, pressure amplitude, velar frequency, ventilatory index, latter representing product of amplitude times frequency), together with blood water chemistry, were measured hagfish exposed either high environmental (HEA) external sea or internal loading by intra-vascular injection. HEA exposure (10 mM NH4HCO3 10 NH4Cl) caused a...
To study the function of arginine vasotocin (AVT) in a specific courtship behavior (body undulation) male Hynobius leechii, we injected various doses AVT or an V1a V2 receptor antagonist into breeding and non-breeding males. After these injections, placed males alone with females Petri dishes measured incidence frequency body undulation. Additionally, to test whether modulates olfactory response males, exposed that were female odors same response. Both intraperitoneally 50 100 µg exhibited...
Abstract To clarify the reproductive function of vibration signals in Hynobius, which has externally fertilized eggs, we quantitatively analyzed body and tail undulations male Korean salamanders (Hynobius leechii) sixteen mating events. One large one small male, female were used each event. We behaviors recorded over a total 3 hrs for event; 2 before 1 hr after female's oviposition. Males touched females using their snouts or trunk throughout entire periods, but males increasingly more...
Hagfish represent the oldest extant connection to ancestral vertebrates, but their physiology is not well understood. Using behavioural (video), physiological (respirometry, flow measurements), classical morphological (dissection, silicone injection) and modern imaging approaches (micro-MRI, DICE micro-CT), we examined interface between feeding unique breathing mechanism (nostril opening, high-frequency velum contraction, low-frequency gill pouch contraction pharyngo-cutaneous duct...
Most previous systems for quantifying ventilatory flow in fish involve prior anesthesia and difficult surgery to sew or glue membranes the animal, which are undoubtedly stressful. By modification of original “van Dam box” design incorporation an electromagnetic blood probe, we have developed a less invasive system that avoids these problems provides breath-to-breath measurements real time. The can be quickly moved out apparatus, facilitating repeated on same animal after different...