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Fish Health and Oceanography Project of the Aquaculture Collaborative Research and Development Program

其他書名	Report of the Initial Project Meeting, 18 December 2001
出版	Fisheries and Oceans Canada, Science Branch, Maritimes Region Biological Station, 2002
URL	http://books.google.com.hk/books?id=CxNQAQAAMAAJ&hl=&source=gbs_api

註釋The Fish Health and Oceanography Project received funding from the DFO Aquaculture Collaborative Research and Development Program (ACRDP) in late 2001. The project's main goal is to enhance understanding of the water circulation and water transport pathways within the Long Pond Bay area of southern Grand Manan and to use this to help assess the influence of the water circulation patterns on fish health and bay management concerns in the area. This report summarizes the presentations given at the initial meeting of the project, held on 18 December 2001. The concepts of Bay Management Areas (BMAs) and single-year-class farming are key aspects of the fish health management strategy for the New Brunswick salmon aquaculture industry. The concept was developed and implemented largely as a result of the outbreak of infectious salmon anaemia (ISA) which started among salmon farms in New Brunswick in 1996. The fish health management strategy includes having all farms with just one year-class on a site at any one time and having all farms within a BMA on the same year-class schedule. The existing BMA boundaries were based on a number of factors, including oceanography, groups that share the resource, wharf usage and company structure. It was recognized that the BMA boundaries could be revised as new information becomes available. In this project, we hope to conduct oceanographic work, which would help redefine the BMA boundaries in southern Grand Manan, in light of the new salmon farms approved for the area and fish health concerns. One of the main motivations behind the project was concern over the oceanographic appropriateness of the BMA boundaries in the southern Grand Manan area, especially following the approval of new farms in the area in 2001. As a result, only one farm in the area, in northern Long Pond Bay (BMA 21), is an even year-class farm, with all the others being odd year-class sites. One of the main questions being asked is whether the sole even year-class farm (which has been operating since 1998) is sufficiently isolated from the other farms to allow it to be considered as an oceanographically-isolated site and if so, could the BMA boundaries be redrawn to reflect this. Although some hydrographic data and current meter records have previously been collected in southern Grand Manan and a preliminary three-dimensional tidal circulation model has been developed, the work was not sufficient to adequately address the issues of concern. Encouragingly, the field observations to date have, for the most part, agreed with the model predictions. However, the current regime in the area is quite complex due to the complexity of the topography and perhaps due to seasonality in circulation-driving functions such as wind and water density structure. In addition, the oceanographic information needs and the interpretation of that information vary according to the fish health issue. Hence, additional field work and model development is required to resolve some discrepancies in observation-model comparisons, to improve the model resolution and observational base in some areas, to characterize the importance of tidal currents to the total circulation and transport of particles and to assess the sensitivity of the model to non-tidal forcing. In recognition of these needs and shortcomings, the project will focus on obtaining current observations from key locations in the southern Grand Manan area, refining and evaluating a high spatial resolution three dimensional tidal circulation and particle tracking model of the area and using the combination of observations and models to generate enhanced advice on the exchange of water, and by inference disease, between farm sites and the general utility of the BMAs in the area. The project will also focus on how to better link oceanographic knowledge with fish health needs, so fish health management advice and actions can better take the oceanographic knowledge into consideration. The specific objectives of this project are: 1. To develop a better understanding of the water circulation within the Long Pond Bay area of Grand Manan by: obtaining more observations, especially in key areas, more fully analyzing existing and new observations, and refining a three-dimensional tidal circulation model. 2. To characterize the fish health issues of importance to the salmon aquaculture industry that may have a significant oceanographic component to their spread and management considerations, especially in the Long Pond Bay area and to define approaches and guidelines for estimating fish health risks based on oceanographic information. 3. To re-examine the implications of the water circulation in Long Pond Bay to the fish health and bay management boundaries within the area. Field work is scheduled to take place mostly in the spring and summer of 2002. A meeting of project participants will be held at the end of the field season to review the results and preliminary analyses. The remaining time of the project will be dedicated to further data analysis, refinement of the circulation model, elaboration of linkages between oceanography and fish health, refinement of the project's conclusions, writing of the final project report(s) and convening of a workshop to present the project's findings. The project is scheduled to terminate in March 2004