Can't find a reference to long leaf pond weed. Does it look anything like this link.

http://aquaplant.tamu.edu/database/submerged_plants/american_pondweed_pics.htm

Try this link to your Coop. Ext.

http://extension.unh.edu/News/GoodPond.htm

65% plant coverage is a lot. The usual top recommended figure is about 20%. Better ID that stuff and find out what the control options are even if you don't use them.

The better the condition of the fish the more likely they are to have more eggs and a bigger spawn.