Iranian Journal of Fisheries Sciences

other Nitrogen and phosphorous budgets for integrated culture of whiteleg shrimp Litopenaeus vannamei with red seaweed Gracilaria corticata in zero water exchange system Biology & physiology Biology & physiology پژوهشي Orginal research papers In this study, a 2×3 factorial design  with two levels of  shrimp density (25 and 50 shrimp per m2) and three  levels of  red algae density (0, 200 and 400g per m2) was applied to calculate  nitrogen and phosphorous budgets in the integrated culture of Litopenaeus vannamei with Gracilaria corticata  during 45 days in a zero water exchange system. Juveniles of L. vannamei (5.82±0.11 g) and G. corticata were cultured in 18 round 1 m3 poly ethylene tanks. Water temperature, dissolved oxygen (DO), pH and salinity were measured once every 3 days.  Results indicated that shrimp density had a significant effect on pH and DO in the morning and in the afternoon. The algal density didn’t have a significant effect on pH and DO in culturing tanks (p>0.05). According to the results of this study, the main source of nitrogen and phosphorus input to the tanks during a 45- day culturing period was from feeds. Shrimp and algal densities significantly affect the concentration of total ammonia, nitrite, nitrate and phosphate in water and an increase in shrimp density led to an increase of these compounds whereas, increasing the algal density led to the reduction of these compounds. Results indicated that increasing the density of G.corticata in all treatments, led to an increase in biomass of harvested shrimp and the co-culture of G. corticata with L.vannamei decreased the amount of nitrogen and phosphorus in both water and sediments and improved the water quality of L.vannamei culture. Nitrogen budget, Phosphorous budget, Litopenaeus vannamei, Gracilaria corticata, Zero water exchange 471 486 http://jifro.ir/browse.php?a_code=A-10-1054-6&slc_lang=other&sid=1 H. Fourooghifard fourooghifard@yahoo.com 100319475328460029535 100319475328460029535 Yes Persian Gulf and Oman Sea Ecological Research Center, Iranian Fisheries Science Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Bandar Abbas, Iran, Persian Gulf and Oman Sea Ecological Research Center, Iranian Fisheries Science Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Bandar Abbas, Iran, A. Matinfar 100319475328460029536 100319475328460029536 No Iranian Fisheries Science Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran Iranian Fisheries Science Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran M. S. Mortazavi 100319475328460029537 100319475328460029537 No Persian Gulf and Oman Sea Ecological Research Center, Iranian Fisheries Science Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Bandar Abbas, Iran, Persian Gulf and Oman Sea Ecological Research Center, Iranian Fisheries Science Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Bandar Abbas, Iran, K. Roohani Ghadikolaee 100319475328460029538 100319475328460029538 No Persian Gulf and Oman Sea Ecological Research Center, Iranian Fisheries Science Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Bandar Abbas, Iran, Persian Gulf and Oman Sea Ecological Research Center, Iranian Fisheries Science Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Bandar Abbas, Iran, M. Mirbakhsh 100319475328460029539 100319475328460029539 No Shrimp Research Center, Iranian Fisheries Sciences Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Bushehr, Iran Shrimp Research Center, Iranian Fisheries Sciences Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Bushehr, Iran