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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 91 for “"Otolith"”.
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Morphometric Otolith Analysis
Abstract Fish otoliths have long played an important role in sustainable �sheries management. Stock assessment models currently used rely on species speci�c age pro�les obtained from the seasonal patterns of growth marks that otoliths exhibit. We compare methods widely used in �sheries science …
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Otolith morphologies in the genus sinocyclocheilus
… to surface fish, and specifically that their otoliths are larger. Otoliths are functionally important and easy to measure components of fish hearing systems. The size, shape, and volume of otoliths were measured as a first step in identifying and understanding evolutionary changes in hearing …
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A closed-loop otolith system assessment procedure
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1983.
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Novel Mechanisms in Zebrafish Otolith Nucleation, Tethering, and Dysfunction
… to study these biomineralized crystals called otoliths, as many required genes are homologous to human otoconial development. This study examines the underlying mechanisms of zebrafish otolith nucleation, tethering, and dysfunction. Here I show that 1) otolith nucleation is impaired in three …
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Growth and otolith zone formation of Namibian hake, merluccius capensis
… of length-frequency distributions (LFDs) from otoliths collected from fur seal scat samples was used to identify cohorts and calculate the approximate hatchdates and growth rates of young M. capensis from 1994 to 2009. Monthly otolith samples of five of these cohorts (1996, 1998, 2002, 2005 and …
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Variability in red snapper otolith microchemistry among Gulf of Mexico regions
… The two objectives of this study were to apply otolith nursery chemical signatures to estimate red snapper mixing dynamics in the western Gulf, and to determine if signatures based upon trace metals associated with oil and gas platforms could discriminate between region and habitat of origin to …
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Molecular and Functional Analysis of Otolith Formation in Zebrafish, Danio Rerio
"Mammalian otoconia and fish otoliths are calcium-carbonate biominerals and important inner-ear organs that detect linear accelerations and perceive gravity. As a result, the absence, degradation, or dislocation of these structures causes severe imbalance in affected animals. The common vestibular …
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Otolith-based discrimination of cod ecotypes and the effect of growth rate
Kvarnalögun hefur áður verið notuð til greiningar vistgerða innan íslenska þorskstofnsins og sterkra áhrifa vaxtarhraða á kvarnalögun ítrekað gætt í ýmsum tegundum fiska. Með það markmið að rannsaka áhrif vaxtarhraða á tengsl kvarnalögunar og vistgerða þorsks (skilgreindar með breytileika á Pan I …
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Arctic Char Otolith Records of Recent Limnological Change in High Arctic Lakes
… the top predatory fish in Arctic lakes. Otoliths, the inner ear bones of fish, offer a method to monitor these impacts through chemical analysis of their annual rings. However, not only are long-term limnological records in the Arctic limited, but the impacts of climate-driven change on …
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Assessing Movement of Fish Through Spectral Analysis of Otolith Life History Scans
… scans of the chemical signatures encoded in fish otoliths (ear stones). I provide a quantitative approach to examining life history scan data using spectral analysis, which retrospectively measures the movement timing for individual fish. Sagittal otoliths from juvenile Atlantic croaker …
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Modeling and Monitoring of Otolith Organ Performance in US Navy Operating Environments
Previous mathematical modeling work has produced a transfer function that relates otoconial layer displacement to stimulus acceleration. Due to the complexity of this transfer function, time domain solutions may be obtained only through numerical methods. In the current work, several approximations …
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A Comparison Of Otolith Growth To Somatic Growth In Largemouth Bass, Micropterus Salmoides
… the nature of the relationships between otolith growth and somatic growth as they relate to previous growth history, largemouth bass (Micropterus salmoides) were injected with calcein to impart fluorescent marks on the otoliths on a periodic basis. Total lengths and weights were recorded …
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An analytic evaluation of the upper break frequency of the human otolith organ
… that the upper break frequency of the human otolith organ is about 1.5 rad/sec. This paper presents an analytical technique to show that this value is approximately two orders of magnitude too small. The accepted lumped parameter model of the otolith organ is approximated to be independent of …
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Uncovering the role of biomineralisation in otolith trace element uptake by microstructural and microchemical analysis
Otolith biomineralisation was examined in order to uncover its role in trace element uptake within otolith structures by microstructural and chemical analysis. The mechanism of otolith elemental incorporation, the orientation of aragonite and the organic matrix in otoliths of four marine species …
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A viscoelastic model for the response of a step change in velocity of the human otolith organs
The otolith organs are housed in the inner ear and are responsible for sensing accelerations and gravity. These inertial sensing systems are modeled in this thesis as a three material system consisting of a rigid otoconial plate attached to the skull by a gel layer, surrounded by a viscous …
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Using otolith shape and DNA to identify the stock structure of the spotted wolffish (Anarhichas minor) around Iceland
… the waters of Iceland, genetic samples and otoliths were collected during the annual spring survey of the Icelandic Marine and Freshwater Research Institute in 2022. Genetic and otolith samples were collected from 185 individuals from Iceland’s West, North, and East coasts. Genetic material …
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The Central Stoneroller, Campostoma Anomalum, as an Indicator of Heavy Metal Contamination Using Otolith Age Determination and Growth Analysis
… S will impart a violet-red mark in stoneroller otoliths that can be viewed with a compound light microscope. Using that dye, a second experiment validated the formation of daily increments in stonerollers provided different food rations. Sedentary behavior in post-larval and juvenile …
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Reimagining the Inner Ear: A Morphometric Modeling Approach for Establishing Shape Change in the Evolution of the Human Otolith System
… canals (detecting angular acceleration) and otolith organs (utricle and saccule; detecting linear acceleration, vibration, and head tilt relative to gravity). The vestibular organs are often considered a single system, with most research focusing on the semicircular canals. The otolith …
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Evaluating Methods for Optimizing Classification Success From Otolith Tracers for Spotted Seatrout (<i>Cynoscion nebulosus</i>) in the Chesapeake Bay
… effective management. Within the last decade, otolith chemistry signatures have been increasingly used as a natural marker to delineate fish from a mixture of nursery sources. Despite the widespread use of otolith trace element and stable isotope ratios as habitat markers, the statistical …
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