Ecotoxicological impact of agricultural contaminants on selected aquatic organisms
Issue Date
10-2008
Abstract
The Pagsanjan-Lumban watershed is the main source of fresh water to Laguna Lake but is surrounded by farms with intensive agricultural activities. Off-site diffusion of pesticides and nutrients from fertilizer applications can have an effect on aquatic life and quality of water resources. Toxicological tests of pesticides (cypermethrin, lambda cyhalothrin, deltamethin and malathion), currently used in agricultural farms (rice, vegetable and coconut) within the watershed, were done in the laboratory on Tilapia fingerlings and duckweed Lemna sp., an important fish food. Deltamethrin, Lambda cyhalothrin and cypermethrin affected Lemna growth at concentrations ≥ 10 ppm. Malathion also affected the growth of Lemna at ≥ 25 mg/L in water. Composite samples of water collected weekly from Majayjay, Laguna had negative impact on the growth parameters of duckweed and the growth and survival of Tilapia fingerlings compared to water collected from Pagsanjan, Cavinti and Lukban. Calculated doubling time of Lemna fronds for Lukban, Pagsanjan, Majayjay and reconstituted fresh water was 9.4, 9.6, 40.4 and 12.5 days, respectively. No recovery of the chlorotic Lemna was observed after exposure of the treated Lemna for 7 days in clean water.
Source or Periodical Title
Philippine Entomologist
ISSN
0048-3753
Volume
22
Issue
2
Page
206-207
Document Type
Article
Frequency
semi-annually
Language
English
Recommended Citation
Bajet, Cristina M., "Ecotoxicological impact of agricultural contaminants on selected aquatic organisms" (2008). Journal Article. 5487.
https://www.ukdr.uplb.edu.ph/journal-articles/5487
En – AGROVOC descriptors
LEMNA; AQUATIC ORGANISMS; CYPERMETHRIN; FRESHWATER; FRESHWATER ECOLOGY; PESTICIDES; AQUATIC ECOLOGY; PHILIPPINES