A police cruiser chasing a reportedly stolen car collided with a camper in Northeast Washington last night, slightly injuring the drivers of the cruiser and camper and closing three blocks of Maryland Avenue for more than an hour, D.C. police said.

The collision occurred shortly after 10 p.m. at 13th Street and Maryland Avenue NE, police said. Moments after the stolen car crossed the avenue at high speed, a camper being driven west on Maryland Avenue was struck by the police cruiser, police said. The cruiser and camper were overturned.

A small propane tank inside the camper spilled onto the street but did not ignite. Firefighters quickly cleaned the spill, which police said posed no threat to the area.

The officer, whose identity was not immediately released, and the camper's driver were treated for cuts and bruises, police said. limit from eight inches to 10 inches and will prohibit selling of yellow perch in February. The daily catch limit will be the first ever imposed on yellow perch in the state.

Brown said he doesn't expect much opposition to the proposed regulations.

"We've heard for a couple of years that there is a problem with perch and something really ought to be done. We believe this is what ought to be done," he said.

The February ban is aimed at protecting yellow fish from commercial harvesting during the beginning of the spawning season.Brown estimated it would decrease the value of the small commercial harvest by about $6,000 a year. He couldn't say how many commercial fishermen will be affected.

Natural resources officials said they believe that acid rain is the main cause of the sharp drop in the reproductive rate for yellow perch.

Brown said the department has conducted tests with yellow perch eggs, using lime in one stream area to reduce acidity. There was a hatch rate of less than 20 percent in the untreated water and 80 percent to 90 percent in the treated water, he said.

"There is no question the rain is more acidic now than it used to be," he said.

The department will continue experiments to determine if it is feasible to reduce acid content of streams by adding lime.

It also will conduct a test in the Wye and Miles rivers to determine the effectivness of stocking streams with baby perch.

Brown said 10,000 to 20,000 hatchery-raised perch will be stocked in the Wye River, and surveys will be conducted to see if there is a substantial improvement in the yellow perch population over the Miles River, which will not be stocked.

The proposed regulations are not emergency regulations, which means they will go through a full round of public hearings. Brown estimated they won't take effect until 1989.

AP-BA-01-12 1409EST