There are numerous links related to fisheries and aquaculture topics.
Some suggested site are:

• Aquaculture
  • AquaNIC
  • USDA
  • Ohio State University - Piketon
  • Kentucky State University aquaculture program
  • National Association for Aquaculture Coordinators
• Fisheries
  • Iowa Department of Natural Resources - Fisheries
    
  • ISU Fisheries Extension
• Aquatic Vegetation Management
  • Aquaplant
  • Center for Aquatic and Invasive Plants - Florida