Fish Mgmt Issues 2010 [Compatibility Mode]

Fish Mgmt Issues 2010 [Compatibility Mode] - Global...

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Global Fisheries & Management Issues World harvest appears to be stable at ~70 million metric tons per year, but optimistic estimates call for 100 mmt The World of Six Bil ion , UN Pop Division 8 10 12 n (bilions) Global Fisheries Landings & The Human Population 0 2 4 6 0 1250 1750 1850 1910 1930 1950 1970 19 20 2020 2040 210 2 Year World Populatio We cannot depend on harvesting fish in the open ocean to feed an ever-burgeoning human population. Shifting Baseline Syndrome Coined by Daniel Pauly to characterize creep in our perception of environmental changes as related to fisheries. ‘Grampa said fishing was better when he was a kid’. “... each generation of fisheries scientists accepts as a baseline the stock size and species composition that occurred at the beginning of their careers, and uses this to evaluate changes.” Over generations the changes have been dramatic and ecosystems have assumed new stable states. Thus we have inappropriate reference points to target rehabilitation measures. We need to reach back in history to understand and overcome the SBS. Otherwise, we cannot appreciate the true social and ecological costs of fisheries. Problems with Landing Statistics Difficult to collect Changing size and numbers Fishing down process: sizes, species, trophic levels Double counting Untruthful reporting Unreported landings Unregulated landings mis MANAGING THE FISHERY The fishing-down process 1950s 1960s 1980s Figure 2 Fisheries, both marine and freshwater, are characterized by a decline of the mean trophic level in the landings, implying an increased reliance on organisms low in food webs (data from FishBase 27 , with Peru/Chile excluded owing to the dominance of Peruvian anchoveta; see also Fig. 1). Freshwater fisheries have lower trophic level values overall, indicating an earlier onset of the 'fishing down' phenomenon 29 . The trend is inverted in non-Asian aquaculture, whose production consists increasingly of piscivorous organisms, as illustrated here for Norway (a major producer, yet representative country) 85 .
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C a t MANAGING THE FISHERY Response to fishing Suggested collapse c h Effort Fish only large species Maximize economic yield Maximize ponderal yield and keep quality Maximize employment WORLD FISHERY STATISTICS: Food and Agricultural Organization (FAO) 1990 1992 1994 1995 1996 1997 Aquaculture 8.17 9.39 12.11 13.86 15.61 17.13 Capture 6.59 6.25 6.91 7.38 7.55 7.70 Total inland 14.76 15.64 19.02 21.24 23.16 24.83 PRODUCTION Inland Marine Aquaculture 4.96 6.13 8.67 10.42 10.78 11.14 Capture 79.29 79.95 85.77 85.62 87.07 86.03 Total marine 84.25 86.08 94.44 96.04 97.85 97.17 Total aquaculture 13.13 15.52 20.77 24.28 26.38 28.27 Total capture 85.88 86.21 92.68 93.00 94.63 93.73 Human consumption 70.82 72.43 79.99 86.49 90.62 92.50 Reduction 28.19 29.29 33.47 30.78 30.39 29.50 Total world 99.01 101.73 113.46 117.28 121.01 122.00 Marine UTILIZATION Production system Figure 1 Time series of global and Chinese marine fisheries catches (1950 to present). a, Global reported catch, with and without the highly variable Peruvian anchoveta.
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This note was uploaded on 09/13/2010 for the course OCS 4012 taught by Professor Baltz,d during the Spring '08 term at LSU.

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Fish Mgmt Issues 2010 [Compatibility Mode] - Global...

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