New Yorkers may soon have to dig a little deeper into their pocketbooks to go to public zoos and recreation centers: In an effort to generate more money for the city’s coffers, the Bloomberg administration is proposing increases to the entrance fees.

The city Department of Parks and Recreation is planning to increase the admission fees at three zoos and six recreational centers to raise roughly $3 million.

Starting later this year, the entrance fee for the Central Park Zoo would jump to $8 from $6 for adults, to $3 from $1 for children, and to $4 from $1.25 for seniors. The same goes for tickets to the Prospect Park and Queens zoos, where, according to a spokesman for the Parks Department, Warner Johnston, the price would be raised to $6 from $5 for adults.

The agency, Mr. Johnston said, is also planning to institute annual fees at the six remaining recreation centers in the city that are still free. Two of those centers are in the Bronx, two are in Brooklyn, and two are in Manhattan. Facilities with pools would charge a $75 annual fee, while those without would charge $50.

Mr. Johnston said that even if the new fees are approved, the recreation centers offer some of the “best deals in the city” and that payment plans would be available for those who can not afford a lump sum. The proposed increases require approval through the budget process.

The Parks Department fee increases were disclosed in the mayor’s $52.2 billion budget, presented on Tuesday. Although the big-ticket budget items focus on the city’s long-term financial health, through paying down debt and planning for predicted future deficits, it also proposes dozens of new fee increases.

The city, for example, is projecting 412,000 more parking tickets. It is also proposing a $525 fee to be paid to the Fire Department for reviewing evacuation plans of high-rise buildings, and is planning to increase fees for pest control exterminations conducted by the Department of Health and Mental Hygiene.

Mr. Bloomberg said he would roll the unexpected $3.3 billion surplus from fiscal year 2006 – which was fueled by higher than expected tax revenues stemming from a strong real estate market and economy – into fiscal year 2007. Deficits are projected at $3.4 billion for fiscal year 2008, $3.5 billion for fiscal year 2009, and $2.7 billion for fiscal year 2010.