In a last minute effort, the Governor of Massachusetts yesterday intervened in a successful effort to convince the state marine fisheries commission to remain conservative in adopting striped bass management for the coming season.

In a three hour meeting, held in Weston, state officials after lengthy discussion adopted a uniform 34-inch minimum size for the catching of striped bass for both recreational and commercial fishermen. This represents a drop in two inches from last year's minimum.

Under the new regime recreational fishermen will have a one fish per day bag limit, the same as last year. The commercial fishing season which lasted less than a month last year will be extended with the following provisions: Fishermen will be allowed to fish for three weeks each month during the season with one week of no commercial fishing. The length of the season, expected to last through the summer, will depend on how quickly fishermen go through a 750,000 pound quota. Last year's quota was 234,000.

Tensions have been high for weeks between rod and reel fishermen and the state Division of Marine Fisheries over public hearings held in March. At each of three public hearings, one here on the Vineyard, state officials strongly argued striped bass management could be relaxed. While complimenting the fishermen for their participation in strict conservation measures for the last 10 years, they said under the federal plan all the northern states could set minimums as small as 28 inches.

More than 90 per cent of those attending the hearings opposed opening up the fishery to recommended levels. Coinciding with the hearings, recreational fishermen had circulated a petition calling for a ban on the commercial fishing of the fish in the state.

Yesterday Division of Marine Fisheries director Philip G. Coates presented a relaxed fisheries management plan. He based his staff report to the commission on recommendations made by the scientific staff of the Atlantic States Marine Fisheries Commission. His memorandum to the commission read: "I assure the commission that the new amendment's cornerstone is to maintain and even increase the current level of spawning stock to prevent depletion as occurred during the 1970s."

John C. Phillips, the state commissioner for Fisheries and Wildlife intervened with his own recommendation and that of Gov. William F. Weld. It was reported that the Governor's recommendations were even more restrictive than commissioner's. The commission then voted for the 34-inch minimum.

Dick Russell, a seasonal resident of Chilmark and the founder in 1983 of Striped Bass Emergency Council, told the Gazette last night after attending the meeting: "I was very pleased by the vote. New York, Maine and New Hampshire were waiting to see what Massachusetts would do and now there is a good chance that these states will also stay at a high size limit."

As a result of the state decision, the petition for game fish status was withdrawn. State officials were not available for comment at press time last night.