Sustainability of shellfish stocks in the Irish Sea Essay

Sustainability of shellfish stocks in the Irish Sea - Essay ExampleThe seminar introduction seeks to find ways that could help sustain the population of fish stocks in the Irish Sea.In tell apart to achieve this, the organisms must be organized into different breeding groups, migration patterns productivity, genetics and habitats must be root explored and understood. The shellfish were organized into a population structure whereby a population is a group of organisms of single species which can freely interbreed and live in the same place at a clock (Atkinson, 2000)2. Populations can be further divided into sub-populations where interbreeding is restricted and the organisms accumulate genetic differences and whitethorn topically adapt to the environment. some other way of organizing the shellfish is by the use of the stock concept. This involves division into stocks for easier management. However, this may not accurately reflect genetic sub-division because in subdivision and pr oductivity concept, each sub-population contributes absolute productivity to the fundamental population which may vary depending on environmental conditions.While extirpation of subpopulations decreases, total productivity may increase vulnerability to environmental change and decrease genetic diversity. In considering subdivision and gene flow, the reducing in size or density of subpopulations may reduce migration between subpopulations and increases genetic drift or may increase migration into some subpopulations. Migration of locally harvested stock contribute to breeding populations over a much wider geographical area, for example, salmon and trout harvested in the ocean contain migrants from many different freshwater streams which are genetically isolated subpopulations and locally adapted to breeding streams (Nielsen, 1994)3.The methodologies used include the migration of larvae or adults between subpopulations, DNA blood of haemolymph or muscle, DNA analysis through gene s equencing and screen for microsatellite markers used to measure genetic diversity. Another