Relative Contributions and Impacts of Aquaculture and Capture Fisheries. James H. Tidwell, Ph.D. Kentucky State University And Geoff Allan, Ph.D. New South Wales Fisheries. Tidwell’s Theory of Fisheries Relativity. Fish is man’s most important source of animal protein (FAO 2000).
James H. Tidwell, Ph.D.
Kentucky State University
Geoff Allan, Ph.D.
New South Wales Fisheries
Fish as % animal protein
North America 10%
1.5 MMT additional product each year!
World Population Increase
The ocean’s bounty is NOT limitless.
50% of ocean fisheries fully exploited.
70% in need of urgent management. (FAO 1999).
What We Have Done? 2000)Invest in bigger, faster boats with longer ranges
Shrimp trawls may kill 10 kg of juvenile finfish for each kg of shrimp
Not only how much but where.
While 80% of beef production is in industrialized nations
Aquaculture Production: 2000)
Developed vs Developing countries
91% omnivores or filter feeders
If terrestrialagriculture had not developed, we could never support the current human population.
A similar juncture has been reached or passed in fish supplies.
Painting with a broad brush. Don’t say aquaculture when discussing one species!!
The Down Side ofFish Farming
“Aquaculture Industry a failure”, study claims
An analysis of these data indicates no statistical relationship between aquaculture production and pelagic fish landings or fish meal production (P values > 0.80)
of Pelagic Fish
Million Metric Tons
Fish Meal Use vs. Total Production in U.S. Catfish this fixed amount is used.
By-Catch + Wastes
Poultry 2 species
Aquaculture 167 species
These have their own environmental costs
Soon they must each supply half of the worlds fish supply.
It could actually increase pressures on marine stocks to supply the shortfall.