Effects of water exchange and abiotic factors on zooplankton and epibenthic fauna in shrimp ponds

2006 ◽  
Vol 37 (14) ◽  
pp. 1387-1399 ◽  
Author(s):  
Frank E Coman ◽  
Rod M Connolly ◽  
Nigel P Preston
Keyword(s):  
Water Exchange ◽  
Abiotic Factors ◽  
Shrimp Ponds ◽  
Epibenthic Fauna

scholarly journals Autonomous water-cleaning machine using solar energy in shrimp ponds

2012 ◽  
Vol 3 (1) ◽  
pp. 30-33
Author(s):  
Thien Ngon Dang
Keyword(s):  
Water Quality ◽  
Water Exchange ◽  
Water Quality Management ◽  
Shrimp Farming ◽  
Coliform Bacteria ◽  
Viet Nam ◽  
Shrimp Culture ◽  
Shrimp Ponds ◽  
Water Cleaning ◽  
Cleaning Machine

Limited water exchange shrimp culture technology is commonly used today in many shrimp farms in Vietnam to reduce water usage, input of diseases and discharge of nutrient-rich effluents into environment as well as to increase the production per unit area. However, a remaining problem in this technology is that the water quality in shrimp ponds will be reduced due to limitation of water exchange for a long period. The accumulation of inorganic components such as waste feed, bacterial deposits or other biological debris at the pond bottom will lead to low dissolved oxygen, high ammonia-nitrogen level, high fecal coliform bacteria and high turbidity which cause a severe degradation of water quality and detriment to shrimp growth and survival. To solve this remaining problem, an autonomous water-cleaning machine for shrimp ponds was designed to control the waste accumulation in the pond. This is an effective solution to replace manual cleaning methods for water quality management in shrimp farming in the coastal area of the Mekong delta of Vietnam. Especially, this technique can be used for biosecure shrimp production systems according to GMP standards to meet the objectives for sustainable development of shrimp aquaculture in Vietnam. Kỹ thuật nuôi tôm không thay nước đang được sử dụng rộng rãi ở các trại nuôi tôm Việt Nam vì giúp giảm lượng nước sử dụng, hạn chế thải nước vào môi trường và giúp tăng diện tích nuôi trồng tôm. Tuy nhiên, bản thân kỹ thuật này cũng tạo nên một sản phẩm chất thải là phân tôm, thức ăn và chế phẩm sinh học xử lý nước dư thừa. Chất thải này dần dần tích tụ dưới đáy ao tạo thành lớp bùn độc, rất thiếu ôxy và chứa nhiều chất gây hại như ammonia, nitrite, hydrogen sul-fide. Để tránh làm giảm diện tích ao nuôi do chất thải tích tụ làm tôm lảng tránh và tăng mật độ tôm nuôi trồng, thiết bị tự hành thu gom chất thải làm sạch nước trong vuông nuôi tôm đã được nghiên cứu, thiết kế và chế tạo thành công. Thiết bị đã thay thế các hoạt động làm sạch chất thải thủ công của con người, không sử dụng các nguồn năng lượng gây ô nhiễm, giảm nhu cầu về điện góp phần phát triển sản xuất tôm sạch đạt chuẩn GMP và phát triển bền vững ở các tỉnh ven biển miền Tây Việt Nam.

scholarly journals THE EFFECT OF ABIOTIC FACTORS ON WATER EXCHANGE IN CONIFEROUS AND DECIDUOUS PLANTS

2018 ◽  
pp. 76
Author(s):  
Владислава Борисовна Придача ◽  
Галина Петровна Тихова ◽  
Татьяна Аркадьевна Сазонова ◽  
Vladislava Pridacha ◽  
Galina Tikhova ◽  
...  
Keyword(s):  
Water Exchange ◽  
Abiotic Factors

Zooplankton and epibenthic fauna in shrimp ponds: factors influencing assemblage dynamics

2003 ◽  
Vol 34 (5) ◽  
pp. 359-371 ◽  
Author(s):  
Francis E Coman ◽  
Rod M Connolly ◽  
Nigel P Preston
Keyword(s):  
Shrimp Ponds ◽  
Factors Influencing ◽  
Epibenthic Fauna

scholarly journals ABIOTIC FACTORS AFFECTING THE ECOLOGICAL STATE OF LAKE NERO ACCORDING TO MATHEMATICAL MODELING. 2. TWO-PHASE MASS TRANSFER IN THE WATER AREA

2020 ◽  
pp. 28-37
Author(s):  
Sh. Pozdnyakov ◽  
S. Kondratiev ◽  
M. Shmakova
Keyword(s):  
Sediment Transport ◽  
Water Exchange ◽  
Abiotic Factors ◽  
Analytical Formula ◽  
Water Area ◽  
Design Solution ◽  
Practical Implementation ◽  
Aquatic Area ◽  
Project Proposal ◽  
Design Solutions

For the shallow Lake Nero, calculations of currents, sediment transport and the intensity of bottom reformation in various hydrometeorological situations were performed. The calculations were carried out using a two-dimensional model of currents and sediment transport in a shallow reservoir and an analytical formula for sediment discharge developed at the Institute of Limnology of the Russian Academy of Sciences. Numerical experiments have been carried out to assess the possible consequences of the implementation of two design solutions aimed at improving water exchange for the recovery of Lake Nero. According to the first decision, it was planned to excavate bottom sediments within the city limits of Rostov in order to increase the depths in the coastal zone of the lake. Calculations showed that for a section of the water area with a deep bottom, the current velocities decrease several times (in some areas, to zero values). The sediment rate will slightly increase directly in the deepening section due to the increase in the cross-sectional area of the flow. Therefor this event will not bring any positive effect. The second project proposal was to be aimed at increasing the transit capacity of the longitudinal section of the aquatic area from the mouth of the main tributary of Sara River to the inflow of Veksa River. Calculations have shown that an increase in depth along the indicated trajectory while maintaining the transferred amount of water masses will also lead to a decrease in the speed of currents. Based on the simulation, it can be concluded that the practical implementation of the presented design solutions will not lead to an improvement in water exchange in the lake, but also vice versa, will contribute to the formation of stagnant zones, especially for the first proposed design solution.

The main principles and results of pollution monitoring of sediments in the river basin

2020 ◽  
pp. 14-20
Author(s):  
B. Korzhenevsky ◽  
Gleb Tolkachev ◽  
Nikolay Kolomiycev
Keyword(s):  
Heavy Metals ◽  
River Basin ◽  
Water Exchange ◽  
Pollution Monitoring ◽  
Small Rivers ◽  
Volga River ◽  
Natural Landscape ◽  
Volga River Basin ◽  
Ivankovo Reservoir ◽  
Selection Of

The problems of modern geological ecology associated with the study of pollution of sediments of water bodies by heavy metals are considered. The Volga River basin is quite heterogeneous, both in geomorphological and hydrological terms, and in thechnogenical development and usage. A fourrank taxonomy is presented for the selection of sites for monitoring, based on a combination of natural, landscape, climatic and thechnogenical factors. To the largest – the highest taxon – sites of the Ist category – bowls of reservoirs with the slopes and the urban zones, industrial and agricultural structures located within them are carried. Within these areas are allocated to smaller taxa, areas category IInd are the industrial and urban zones, areas category IIIrd are the small rivers without significant contamination and areas category IVth to conduct special observations. The examples of special observations in the study of the annual migration of heavy metals in the system «bottom sediments – water column» on the Ivankovo reservoir are highlighted. The investigations were carried out under the conditions of the standard flow rate for this reservoir and in the conditions of slow water exchange.

Density-driven water exchange controls seasonal declines in jellyfish (Aurelia aurita) abundance in a shallow fjord system

2018 ◽  
Vol 597 ◽  
pp. 137-145 ◽  
Author(s):  
J Goldstein ◽  
C Jürgensen ◽  
UK Steiner ◽  
HU Riisgård
Keyword(s):  
Water Exchange ◽  
Aurelia Aurita ◽  
Fjord System
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