This research undertaking was conducted in Aparri, Cagayan, particularly at the Cagayan River Estuary. The study generally characterized the catch rates and socio–economic dynamics of the filter net fisheries of the said estuary. The study utilized of questionnaires to obtain the data. It also considered personal interviews and observation to validate the data. Results revealed that majority of the respondents were married, have children ranging from 1-4, aged 26-40, finished elementary level of education, with no extended family. Majority of the respondents were engaged in fishing without alternative source of income. On gear species accounting, most of the drift filter net fishers consumed 1-2 hours per haul with alamang catch of 11-20 cans per haul and 9-10 hours per haul with 1-5 kilograms per haul for the stationary filter net fishers. Majority of the fishers have 3-4 hauls per day. On sales and sharing scheme of the drift filter net fishers, majority of the drift filter net fishers had sales of 10,000 and below per fishing trip, majority of the fishermen had a share of 500.00 per fishing trip. As to the respondents’ involvement in community activities, most of them joined community activities despite the fact that they do not hold any position in the community. There were 19 identified species that were caught by the drift filter net (DFN) and stationary filter net (SFN) for the months of May & June, with respect to moon phases. Catch per unit effort of “saplar” was higher than that of “banwar”.