There are 5 ft radius Hawaiian throw nets like you see pictures of the Tahitian kids throwing off the reefs. very easy to catch protein of all sorts. Small fish, crayfish, large fish. Fish nets are probably the most efficient way to catch protein. A mono-filament light weight gill net will be the most efficient way to catch larger fish. The source below has a catalogue for all types of nets and traps - mosquito netting, gill nets, cast nets, trot line setups, animal traps, trellis nets, seines, fish traps, fish hooks, etc.
Memphis Net and Twine Co, Inc
901 458 2656 Voice
901 458 1601 Fax
2481 Matthews Ave
PO Box 8331
Memphis TN 38108
Suggestion from Jack