The Department of Marine Biology is the first department in the Faculty of Marine Sciences. Established in 1395AH (1975) as a Marine Science Department in the Faculty of Science, it developed into Marine Biology Department in the year 1398 AH (1978). A large number of students have graduated from the department armed with knowledge to serve the nation and have occupied several important positions. The department looks forward to more of the graduates, post-graduates and doctorates after the adoption of the plan proposed by the department. We, in Department of Marine Biology, seek to actively keep abreast of developments in the field of marine biology. By taking advantage of internal expertise available to us and opening the possibility of cooperation with other institutes and universities specializing in this area, the Department of Marine Biology strives to become one of the best scientific departments specializing in the area. This cannot be achieved without the support of my fellow faculty members, technicians and all the employees of the department, who I thank for their cooperation and their contribution to the progress of the department and look forward to more.