Abstract
Massive use of insecticides along Laguna de Bay exacerbates the poor condition of the lake waters. Hence, this study was done to evaluate the size and number of Melanomacrophage (MMCs) of ten freshly caught sampled O. niloticus L. (April 2010-May 2010, dry season; October 2010-November 2010, wet season) collected from bay fish cages with no sexual preferences and from a reference pond per season for five consecutive weeks. The spleen was obtained and stained by Perl's technique. The study revealed that there were significant (P < 0.05) differences in the number of splenic MMCs during the dry season while there were no significant differences (P > 0.05) during the wet season. Also, there were no significant differences (P > 0.05) in the sizes of MMCs for both seasons. The results, suggest that MMCs are reliable biomarkers for water quality in terms of environmental stress because of insecticides loading.
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