HW 5 - 1. They ask you what is the best method for...

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1. They ask you what is the best method for monitoring yearly changes in the abundance of adult (spawning age) fish. In detail, what procedure do you recommend? a. Indicate changes in population by using catch per init effort. CPUE is applied by fishing with same gear for same length of time or same distance of net haul in successive years, multiplying by total are to estimate total population and comparing catch trends from year to year. 2. They ask you what is the best method for forecasting the biomass of adult hake a few years in advance. What happens at a certain stage in the life cycle of fish that is believed to determine the future abundance of adults? a. Virtual population analysis is used to track estimated numbers of each year class as it ages. Calibrate estimated from commercial catch to numbers from research surveys, numbers decline due to morality and mortality can be calculated. Sum of all year- classes gives total estimated population number, times weight gives biomass. 3. In detail, what procedure do you recommend for forecasting the abundance of adult hake a few years in advance? a. Estimate recruitment to each year class where total population is the cumulative effect of multiple year-class successes of failures. 4. They ask you for some background on the past abundance of hake. You find a useful page on the web site of the UW Climate Impacts Group. What about the population structure of hake accounted for the biomass level in the late
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This note was uploaded on 02/09/2009 for the course OCEAN 16204 taught by Professor Strickland,richardm. during the Spring '09 term at University of Washington.

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HW 5 - 1. They ask you what is the best method for...

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