Dietary Habits and Distribution of Some Fish Species in the Pansipit River-Lake Taal Connection, Luzon Island, Philippines

Milette U Mendoza, Kenoses L Legaspi, Marion G. Acojido, Arvin C Cabais, Jose Luis E. de Guzman, Abelardo M. Favila, Stephanie M. Lazo, Jed B. Rivera, Jonathan Carlo A. Briones, Rey Donne S. Papa
Vol 18 No 2 (2015), pp.




The interface between lakes and their outlet rivers is an interesting research site for fish community dynamics because it is immediately exposed to disturbances in lake ecosystems. In this paper, observations on the species composition, dietary habits and distribution of fish in the upstream area of Pansipit River - sole outlet of Lake Taal, were presented. Fish samples comprised of juvenile fish from 12 species, including four that were introduced. These non-native species were more abundant than native fish caught. Dietary analyses suggest that non-native fish have a wider dietary breadth compared to native fish and may be one reason why introduced fish populations have exceeded native fish populations in the area. Fish activity varied depending on time of day in certain sub-sites and these fishes aggregated in intermittent deep pools when water depth is uniformly low in the river during the dry season. These suggest that fish abundance in the area is associated with river water depth and other environmental factors. Overall, the study stresses the need for more in- depth research in Pansipit River given its importance as a migratory path and its potential as a refugia for the riverine fish community.


Keywords: diet analysis, river refugia, tropical caldera lakes, hydroacoustic survey, echo-sounder


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