Author/Authors :
Shirmohammadi، Mehrnaz نويسنده Dept. of Marine Biology, Faculty of Marine Science and Oceanography, Khorramshahr Marine Science and Technology University, Khorramshahr, Iran , , Doustshenas، Babak نويسنده Dept. of Marine Biology, Faculty of Marine Science and Oceanography, Khorramshahr Marine Science and Technology University, Khorramshahr, Iran , , Dehghan Mediseh، Simin نويسنده South Aquaculture Research Center, Ahwaz, Ahwaz, Iran , , Savari، Ahmad نويسنده Department of Marine Biology, Khorramshar University of Marine Science and Technology 669 Khorramshar, IR Iran , , Sakhaei، Nasrin نويسنده Dept. of Marine Biology, Faculty of Marine Science and Oceanography, Khorramshahr Marine Science and Technology University, Khorramshahr, Iran ,
Abstract :
This study was undertaken to survey impacts of bottom trawling on distribution and diversity of
gastropods of the Bahrakan Fishing Area (BFA), of the northwestern coasts of the Persian Gulf.
Gastropod samples were collected from depths of 6m and 10m at 18 randomly selected stations in
three occasions, right before the opening of shrimp trawling season and two weeks and 3 months after
the fishing season ended. Majority of sediments displayed silt-clay texture. Abundance, diversity,
richness and evenness indices of gastropods decreased but conversely, Simpson dominant index
increased in all post–season samplings compared to pre-season samplings in both depths (P < 0.05).
Biomass of gastropods declined after trawling and no recovery occurred after three months. However,
the abundance of smaller gastropods increased after trawling. In both depths, Acteocina involuta was
found abundantly in two weeks after trawling. Impacts of trawling were higher in shallow areas (6m
depth) than that in the deeper areas (10m depth).
