A bill to authorize appropriations for fiscal years 1978, 1979, and 1980 to carry out the Atlantic Tunas Convention Act of 1975.

Amends the Atlantic Tunas Convention Act to: (1) authorize appropriations for fiscal years 1978, 1979, and 1980 to carry out the purposes of the Act; and (2) redefine "fisheries zone" to fix the outer boundary of such zone at a point which is 200 nautical miles from the baseline from which the territorial sea is measured.