Environmental assessment of fishpen culture in Pansipit River (barangay [village] Poblacion, San Nicolas, Batangas [Philippines])
1999
Santos, R.A.V. (Philippines Univ. Los Banos, College, Laguna (Philippines). School of Environmental Science and Management)
Results of the investigation showed possible significant impacts to occur on the biological and socioeconomic subsystems of the river. On a short-term period, adverse impacts are seen for open fishermen who will not look for other fishing grounds. Disturbance of the benthic habitat is also foreseen. Water quality will also be affected because of the enrichment of the nutrient pool when bamboo stakes or net serve as medium for attachments of phytoplankton. Continuous flushing of the river will ensure that eutrophication of the river is least likely. It is also possible that improvement of the fishery resources (diversity and population) will take place. Considering the economic net benefit of the operators, it was suggested that tilapia culture in the river, with certain limits, should be continued. However, addition of pens should be monitored since the present number has already congested the river aside from obstructing the navigation
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