Use of Intestinal Tissue of Pomadasys kaakan and Lutjanus johnii as Biomarkers of Contamination in The Oman Sea

Tissue lesions is one of the reliable biomarkers of present contaminants in aquatic environments and aquatic body. The aim of the present study was to investigate the histopathology of intestine tissue as a marker of environmental contamination in Pomadasys kaakan and Lutjanus johnii in the Oman Sea.
 

Nine Pomadasys kaakan (average length 35.5±4.35 cm and mean total weight 512.6±58.5g) and 9 Lutjanus johnii (mean length 22.5±3.41 cm and mean total weight (205.6±22 g) of the three stations of Konarak, HaftTir and Ramin were caught using by gillnet in winter 2016. The intestine tissue of fish was separated and fixed in Bowen's solution to observe the type and severity of tissue lesions. After routine histological procedures, 5 microns thick sections of intestinal tissue were prepared using microtome cutting device and stained with hematoxylin-eosin. Then, tissue lesions were evaluated using a light microscope equipped with a digital camera.

Lesions such as necrosis, pyknotic nuclei formation, hemorrhage, vacuolation, hyperplasia and cell swelling were observed in fish intestine tissue at the studied stations. The lowest tissue lesions were observed in fish caught at the Konarak and Ramin stations and the highest at Haft Tir station.

Which could be due to the increased traffic and catching of fishing boats, cargo ships and commercial vessels in the semi-closed waters of these harbours