Hydro biological study of Laft & Khamir (Khooran Estuaries)

Abstract

Coastal area with a complex ecosystem such as estuaries, lagoons, creeks and are special for nursery grounds, developing area for short time of larva of most marine organisms with high potential rate. Khooran estuaries are of high ecological importance in Hormozgan waters. In this study, fluctuations some biological and hydrological factors were Inonitored from Apr, 1999 to Apr, 2000 monthly, in khooran estuaries. Thirty-nine groups of fishes, 23 families of Ichthyoplanktons, 6 groups of macrobenthose and 54 genera of phytoplanktons were identified. Frequency and weight of sampled fishes was high during Oct, Nov, May & July J respectively. Density of Ichthyoplanktons were higher in west branch, of estuary the most frequency of ichthyoplankton were related to Clupeidae, Gobiidae, uscianidae. Amongst phytoplanktons diatoms density were higher than dinoflagellates and cyanophyceae. Nematoda, Gastropod and Bivalve had the most density of Macrobenthos In west branch & Bivalve, Polychaeta and Crustacea were the most frequent groups at , macrobenthose in the east branch estuarjes, Chlorophyl a, nutrients (N03.N02T04.Si02) ), Poc,' Oc, Do, pH, Salinity & Temperature were measured from 12 sampling stations. Results showed that photosynthesis and photosynthesis Pius detritus are the main resources of Poc In east and west branches respectively (P<0.05) Sediment composition were made mostly of fine sand in mouth of estuarine branches and of silt & clay in other parts. Oxidized carbon rate showed a direct relationship with silt (r =9), and clay (r = 0.79) percentage.