President Carter met 30 minutes yesterday with Soviet Ambassador Anatoly F. Dobrynin to discuss strategic arms limitations negotiations and recent violations by Soviet vessels of the United States' 200-mile offshore fishing limit.

The smiling Dobrynin emerged from the White House about 5 p.m. and told reporters he had not delivered a mesage to Carter from Soviet leader Leonid I. Brezhnev.

The White House described the meeting as "constructive and useful" and said it dealt only brefly with the fishing rights violations.

The meeting occurred the day after the Coast Guard had ordered a second Soviet fishing vessel into Boston harbor for violating the 200-mile limit. Over the weekend, the Coast Guard, with the President's personal approval, seized a Soviet fishing ship for a violation.

However, White House deputy press secretary Rex Granum said the meeting had been arranged before the seizure and did not result from any tension growing out of it.

Also attending the meeting, according to the White House, were Vice President Mondale, Secretary of State Cyrus R. Vance, national security adviser Zbigniew Brzezinski and Robert Hunter of the National Security Council.

In answer to a question on another foreign policy subject, Granum said the U.N. Ambassador Andrew Young's "basic overview" of what policy the U.S. should take in Africa "is not in disagreement with that of the President."

Granum was asked about Young's statement at a press conference Monday that Americans shouldn't "get all paranoid" about the presence of Cuban troops in Angola.

Asked if Carter agreed with that statement, Granum did not reply directly, but said U.S. policy in Africa is still evolving in the Carter administration and Young's views "are considered" in formulating that policy.