Pigment structures of pyrethroid-induced Melanomacropahe Centers (MMCS) among Nile tilapia (Oreochromis niloticus Linn)

Issue Date

10-2009

Abstract

This study intended to establish an account of pigment composition of Melanomacrophage Centers (MMCs) in Nile tilapia induced through the time course pattern utilizing 1.6 ug/L cypermethrin and 15.0 ug/L deltamethrin. Observations were taken on the 3rd, 7th, 11th and 15th day of exposure to the insecticides. Measured parameters included body weights, relative organ weights of liver and spleen, MMC counts, MMC Size, and pigment composition of MMCs. There were no significant differences among body weights and relative spleen weights of treated groups for both insecticides. Relative liver weights, however, were significantly different. Cypermethrin-exposed fish did not form MMCs in the liver while deltamethrin-exposed fish showed MMC formation in the liver at 7th day of exposure. Exposure to cypermethrin induced formation of a significant number of MMCs in the spleen although the sizes of these MMCs were not significantly different from those of control fish. Hemosiderin and lipofucsin were the only pigments accounted for in this study, with the latter of greater quantity than the former.

Source or Periodical Title

Philippine Entomologist

ISSN

0048-3753

Volume

23

Issue

2

Page

201

Document Type

Article

Frequency

semi-annually

Language

English

En – AGROVOC descriptors

OREOCHROMIS NILOTICUS; TILAPIA; PYRETHROID INSECTICIDES; CYPERMETHRIN; INSECTICIDES; PESTICIDE EXPOSURE

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