Thesis (M.S.) in Resource Ecomonics and Policy--University of Maine, 2002. / Includes vita. Includes bibliographical references (leaves 66-68).

No description available.

No description available.

Thesis (Ph. D.)--University of Rhode Island, 2005. / Typescript. Includes bibliographical references (leaves 103-112).

Melanogrammus aeglefinus, commonly known as haddock, is a commercially important marine fish species closely related to cod. Preliminary investigations into the immune function of this species has revealed several unique and interesting features, including an unusually high number of expressed alleles of Major Histocompatibility (MH) Class I genes. The goal of this project was to examine the sequences of alleles, including the untranslated regions, for potential regulatory mechanisms which may limit the number of alleles expressed to the point of functional molecules. Using a cDNA library from an individual haddock, a total of 22 unique alleles were isolated and sequenced, and three putative mechanisms for limiting expression were revealed. The first mechanism was the inversion of the open reading frame within the transcript. The second mechanism was the linking of the MH Class I transcript with the transcript of another gene. The third mechanism was non-classical substitutions at the nine amino acid residues involved in peptide anchoring. These three mechanisms represent novel ways of limiting expression and effectively reduced the number of alleles which could be expressed into functional classical MH Class I molecules.

Melanogrammus aeglefinus, commonly known as haddock, is a commercially important marine fish species closely related to cod. Preliminary investigations into the immune function of this species has revealed several unique and interesting features, including an unusually high number of expressed alleles of Major Histocompatibility (MH) Class I genes. The goal of this project was to examine the sequences of alleles, including the untranslated regions, for potential regulatory mechanisms which may limit the number of alleles expressed to the point of functional molecules. Using a cDNA library from an individual haddock, a total of 22 unique alleles were isolated and sequenced, and three putative mechanisms for limiting expression were revealed. The first mechanism was the inversion of the open reading frame within the transcript. The second mechanism was the linking of the MH Class I transcript with the transcript of another gene. The third mechanism was non-classical substitutions at the nine amino acid residues involved in peptide anchoring. These three mechanisms represent novel ways of limiting expression and effectively reduced the number of alleles which could be expressed into functional classical MH Class I molecules.

Thesis (Ph. D.)--University of Washington, 2004. / Vita. Includes bibliographical references (leaves 157-173).

Cod, haddock and whiting are among the most economically important species in the Scottish demersal fishery. Juvenile settlement, the transition from pelagic to demersal habitat, has been identified as an important milestone for these species, but there is insufficient knowledge and data about this life stage. It is believed that the period of settlement has an impact on recruitment success, as important density-dependent processes may take place, such as competition for suitable substrate, refuge or prey. Also, knowledge of settlement timing and duration is relevant to understanding population connectivity and thus to the development of successful conservation measures. Sampling was conducted between April and August 2004, June and September 2005 and June and July 2006 at an inshore site off the east coast of Scotland. Over 4000 0- group cod, haddock and whiting were collected. Comprehensive morphometric and dietary analyses of the samples were carried out, followed by statistical analysis of the data. The results suggested clear differences in the patterns of settlement between the different species. Initially juvenile haddock favoured deeper, further offshore locations, while cod occupied shallower, inshore waters. Whiting settled much later in the season and over protracted period of time. Furthermore, cod showed an affinity for structured habitat, while haddock and whiting were found only over sand. The results also showed that the transition from the pelagic to the demersal habitat was associated with clear and progressive changes in the prey composition of the juvenile fish. The results also showed temporal, spatial and dietary niche segregation of settling juveniles, which is expected to reduce competition for resources and increase the potential for settlement success.

Thesis (Ph. D.)--Joint Program in Oceanography/Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Dept. of Biology; and the Woods Hole Oceanographic Institution), 2011. / Cataloged from PDF version of thesis. / Includes bibliographical references. / The ultimate goal of early life studies of fish over the past century has been to better understand recruitment variability. Recruitment is the single most important natural event controlling year-class strength and biomass in fish populations. As evident in Georges Bank haddock, Melanogrammus aeglefinus, there is a strong relationship between recruitment success and processes occurring during the planktonic larval stage. Spatially explicit coupled biological-physical individual-based models are ideal for studying the processes of feeding, growth, and predation during the larval stage. This thesis sought new insights into the mechanisms controlling the recruitment process in fish populations by using recent advances in biological-physical modeling methods together with laboratory and field data sets. Interactions between feeding, metabolism and growth, vertical behavior, advection, predation, and the oceanic environment of larval haddock were quantitatively investigated using individual-based models. A mechanistic feeding model illustrated that species-specific behavioral characteristics of copepod prey are critically important in determining food availability to the haddock larvae. Experiments conducted with a one-dimensional vertical behavior model suggested that larval haddock should focus on avoiding visual predation when they are small and vulnerable and food is readily available. Coupled hydrodynamics, concentration-based copepod species, and individual-based larval haddock models demonstrated that the increased egg hatching rates and lower predation rates on larvae in 1998 contributed to its larger year-class. Additionally, results from these coupled models imply that losses to predation may be responsible for interannual variability in recruitment and larval survival. The findings of this thesis can be used to better manage the haddock population on Georges Bank by providing insights into how changes in the physical and biological environment of haddock affect their survival and recruitment, and more generally about the processes significant for larval fish survival. / by Colleen Mary Petrik. / Ph.D.

High Hydrostatic Pressure (HHP) application, alone or in combination with refrigeration, ambient or moderate heating temperatures / inactivates pathogenic and spoilage microorganisms and conserves the product &bdquo / &bdquo / freshness