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Intern. J. Environ. Studies, 2002, Vol. 591), pp. 59 ± 71 CAUSES OF FISH MORTALITY ALONG THE QATARI WATERS ARABIAN GULF) M. A. AL-ANSI a , M. A. R. ABDEL-MOATI b, * and I. S. AL-ANSARI a a Marine Science Department, University of Qatar, Doha P.O. Box 2713, State of Qatar; b Oceanography Department, Alexandria University, Moharam bey 21511, Alexandria, Egypt Received in ®nal form 24 January 2001) Excessive ®sh mortality were observed along the Qatari coastline and oshore during the summer of 1996 and 1998. Massive amounts about 40 tons) of dead ®sh were recorded o the eastern coast. Siganidae, Lethrinidae and Carangidae, coral reef inhabiting ®sh, were the main species observed dead along the beaches. Hydrographic parameters temperature, salinity and dissolved oxygen) and main pollutants ex: NH 4 , TPH, BOD 5 , metals, PCB's and PAHs), as well as chlorophyll a were monitored. Pollutants levels during summer were around background concentrations. Thermal plumes from industrial facilities don't extend more than 2 kms oshore. Fish kills did not follow the appearance of patchy algal blooms during spring and autumn seasons. Temperatures along the Qatari coast rising to 37.0 C during summer 1996 and 38.6 C during summer 1998, seem to be the main reason for ®sh-kills. The 35 C are regarded as the threshold beyond which ®sh-kill phenomena exist. Beside the control and monitoring of landbased and marine derived pollution sources, the development of a Temperature and Red tide Watch Program in the Gulf is a must. Keywords: Fish kill; Temperature; Red tide; Qatar; Arabian gulf INTRODUCTION Qatar is a peninsula located along the western coast of the Arabian Gulf between latitudes 24 30 0 and 26 34 0 N and longitudes 50 40 0 and 52 45 0 E. The total land area is 11,437 km 2 surrounded by 35,000 km 2 of Gulf water with an average depth of 30 m. Because of its *Corresponding author. e-mail: [email protected] Print ISSN: 0020-7233. Online ISSN: 1029-0400. # 2002 Taylor & Francis Ltd DOI: 10.1080/00207230290011526

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