Environmental assessment of fishpen culture in Pansipit River (Barangay Poblacion, San Nicolas, Batangas) [Philippines]
1993
Santos, R.A.V.
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 offered because of the commercial feeds being supplied to the fingerlings. In the long-run, positive impacts will prove beneficial from the operators to the consumers who will be ensured of continuous fish supply. On the water quality level, potential improvement of primary productivity is possible because of the enrichment of the nutrient pool and when bamboo stakes or net serve as medium for attachments of the phytoplankton. Continuous flushing of the river will ensure that eutrophication of the river is least likely. From here, it is also possible that an improvement on the fishery resources (diversity and population) will take place. Considering the economic net benefits of the operators, this suggest that tilapia culture in the river, within certain limits, should be continued. However, along with this, monitoring on the number of pens operating should be monitored since present number of these has already congested the river aside from obstructing the navigation
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