Genetic variability in marine bivalvia: implications and applications in molluscan mariculture
AuthorWilkins, N P
MetadataShow full item record
AbstractThe extent of genetic variability at enzyme gene loci is assessed in twelve species of marine bivalve molluscs of actual or potential commercial importance. Approximately one third of these loci are polymorphic, average heterozygosity is 0.14, and an average of 3.9 alleles are segregating per polymorphic locus. Hatchery-produced samples exhibit a lower proportion of polymorphic loci and a loss of some alleles at polymorphic loci. In two hatchery-produced families of Crassostrea gigas, phenotype frequencies at two loci depart from Mendelian expectations in young individuals. The implications of these hatchery induced alterations are discussed, together with some possible applications of biochemical genetics in molluscan mariculture.
DescriptionPermission to include this article in this repository has been obtained from the author, Professor Noël P. Wilkins.
CitationWilkins, N.P. (1976) Genetic variability in marine bivalvia: implications and applications in molluscan mariculture. Proceedings of the 10th European Symposium on Marine Biology Vol. 1: Mariculture, pp. 549-563
Showing items related by title, author, creator and subject.
OATP (Evaluation of the promotion of Offshore Aquaculture Through a Technology Platform)Jackson, D.; Drumm, A.; Fredheim, A.; Lader, P.; Fernáandez Otero, R.; Marine Institute; SINTEF Fisheries and Aquaculture Ltd.; Centro Technologico del Mar, Fundacion CETMAR (Marine Institute, 2011)This is the final report of the project OATP which investigated the opportunity and usefulness for the aquaculture industry to promote offshore aquaculture through a technological platform. The report is divided into five sections and begins with an executive summary of the project. In section two it discusses the European aquaculture sector including vision, strengths and gaps. The third section involves stakeholder consultation feedback, touching on potential species, regulation, planning frameworks, safety, environmental considerations and technology involved. Section four offers recommendations for stakeholders, covering ethical issues, potential species, regulation, planning, safety and environment as well. The fifth and last section features a sector overview by country and report appendices.
Inferring marine distribution of Canadian and Irish Atlantic salmon (Salmo salar L.) in the North Atlantic from tissue concentrations of bio-accumulated Caesium 137Spares, Aaron D.; Reader, Jeffery M.; Stokesbury, Michael J.W.; McDermott, Tom; Zikovsky, Lubomir; Dadswell, Michael J. (Oxford University Press, 2007)Atlantic salmon returning from marine migrations to eastern Canada and western Ireland during 2002 and 2003 were analysed for tissue concentrations of bio-accumulated caesium 137 (137Cs). Salmon from Canadian and Irish waters demonstrated concentrations (0.20 ± 0.14 Bq kg-1 and 0.19 ± 0.09 Bq kg-1, mean ± s.d., respectively) suggesting similar oceanic feeding distributions during migration. Canadian aquaculture escapees had a similar mean tissue concentration (0.28 ± 0.22 Bq kg-1), suggesting migration with wild salmon. However, significantly higher concentrations in 1-sea-winter (1SW) escapees (0.43 ± 0.25 Bq kg-1) may alternatively suggest feeding within local estuaries. High concentrations in some Canadian 1SW salmon indicated trans-Atlantic migration. Low concentrations of Canadian multi-sea-winter (MSW) salmon suggested a feeding distribution in the Labrador and Irminger Seas before homeward migration, because those regions have the lowest surface water 137Cs levels. Estimates of wild Canadian and Irish salmon feeding east of the Faroes (~8oW) were 14.2% and 10.0% (1SW, 24.7% and 11.5%; MSW, 2.9% and 0.0%), respectively. We propose that most anadromous North Atlantic salmon utilize the North Atlantic Gyre for marine migration and should be classified as a single trans-Atlantic straddling stock.
Tools for Appropriate Assessment of Fishing and Aquaculture Activities in Marine and Coastal Natura 2000 Sites. Report V: Intertidal and Subtidal Coarse SedimentsABPmer (ABP Marine Environmental Research Ltd, 2013)Ireland has many coastal and marine habitats and species that are of national and international conservation importance. The value of these has been recognised by the designation of a number of Special Areas of Conservation and Special Protected Areas through the EU Habitats Directive (92/43/EEC) and EU Birds Directive (2009/147/EC). Together these sites form part of the European network of Natura 2000 sites. This report and accompanying annexes is part of a series of documents that present a risk assessment tool developed by ABPmer to assess the effects of fishing and aquaculture activities on the Annex I habitats and Annex II species present in Natura 2000 sites. The tool is designed to support the preparation of screening statements and Appropriate Assessments. Specifically this report presents the project deliverables for the assessment of coarse sediments and describes the potential use of the risk assessment tool.