Biological investigation of parachromis managuensis (Gunther, 1867 in Taal Lake, Philippines

Issue Date

12-2006

Abstract

This study was conducted to describe the ecological parameters in Taal Lake where the alien/invasive species Jaguar Guapote (Parachronis managuensis) was "illegally" introduced. This study also aimed to contribute in the analysis of some of its biological aspects. Surface water temperature range recorded was within the normal level (30.0˳C - 30.71˳C.). On the other hand, pH levels were moderately alkaline and almost within the same range (8.30 -8.70). Likewise, dissolved oxygen levels were moderately high in Talisay(10.22 ppm) and Tanauan (10.16 ppm), and lower value was obtained in Laurel (8.30 ppm. Majority of the sampling stations had sandy to muddy bottom. Based on the samples, male P. management were slightly larger than females. Spawning of the species in Taal Lake was throughout the survey period with peaks in July and December. Taal fecundity of the fish was between 904 to 10,496 eggs and with an average of 3,158 eggs/female. Jaguar guapote is a piscivorous species and the major food items found in its gut were fish (56.40%), predominatly. Atherina spp., Ambassis spp., and thecichlids, tilapia and guapote. It is anticipated that the alien fish could become abundant in all areas of Taal Lake because of the luxuriant growth of aquatic vegetation which serves as their spawning and feeding grounds, abundant natural food, and favorable environment. This may cause serious damage to native fish communities through direct predation.

Source or Periodical Title

Journal of Environmental Science and Management

ISSN

0119-1144

Volume

9

Issue

2

Page

20-30

Document Type

Article

College

School of Environmental Science and Management (SESAM)

Frequency

semi-annually

Physical Description

map, graphs, tables, picture

Language

English

This document is currently not available here.

Share

COinS