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1
Tournament-associated Mortality in Black Bass
Gene R. Wilde
Fisheries, Vol. 23 No. 10, Oct. 1998
Presented By:
Holly A. Campbell
2
130 tournaments, 1972-1996
• Objectives:
– Determine average rates of initial, delayed, and total mortality associated with tournaments
– Determine whether any changes in magnitude of sources of mortality has occurred since the 1970’s
– Combine results from from independent studies to assess overall effects of water temperature, tournament size, and fish size on mortality
– Model relationship between water temperature and initial, delayed and total mortality
3
Methods
Calculated mean, initial and delayed mortality for three
Periods:– 1970-1979– 1980-1989– 1990-1996
Used ANOVA to determine if mortality varied among periods, and to find correlation between water temp., fish size, and tournament size
4
Major Findings
• Initial mortality of tournament black bass has decreased from 19.5%-6.5% since 1970’s
• Delayed mortality likely decreased between 1970-1980’s, based on large decrease in initial mortality
• No evidence of decrease in delayed or total mortality between 1980-1990’s.
• Decreases in tournament mortality also supported by angler self-reports.
5
Recommendations
• Future studies should include descriptions of all aspects of tournaments (sponsors, length of fishing day, length of contest, etc.) in addition to mortality rates, water temp., etc.
• Studies of water conditions (bad weather, rough waters) should be considered.
• Results of individual tournaments should be reported independently rather than summaries of many tournaments