Tiger Shrimp Migration in the Iranian Seashore of Persian Gulf

One of the most characteristic behaviour of cruastaceans is the seasonal as well as daily migrations which is influenced by light intensity, temperature and Co2concentration. Other surveys have indicated that light intensity has the greatest effect on their migration. The Persian Gulf is situated in the northwestern-southeastern direction which cause uneven absorbtion of solar energy explaining migratory behaviour of tiger shrimp. The abundance area of tiger shrimp lies between Naiband Bay in the south and Baherkansere in the north. Studying the fluctuations of light intensity in different depths which effect some biological characteristics of shrimp shows that 1 - Light intensity and temperature are the main factors, which result the vertical migration of the shrimp. 2 - Shrimp migration in warm and cold seasons is mainly due to temperature difference between northern and southern part of the Persian Gulf 3 - Light intensity and temperature are also the main factors which affect shrimps migration and uneven shrimp density in different depths of water, so that in warm and cold seasons the highest shrimp density is seen in depth more than 30 meters and in moderate seasons (fall and spring) shrimp density in deep area decreases greatly.