Biological control of invasive zebra mussel (Dreissen polymorpha) in a freshwater ecosystem through Potamon ibericum

In the present study, possible effects of using Potamon ibericum for the prevention of zebra mussel (Dreissena polymorpha) invasion in a freshwater ecosystem were investigated. In a recirculating aquaculture system (RAS) supplied with aerated freshwater, 3 individuals of P. ibericum were placed in each of 3 aquariums provided by 100 zebra mussels. Throughout the 90-day monitoring study, mussel consumption was visually counted and then new mussels were introduced daily to complete the number of mussels to hundred, repeatedly each day. Throughout the monitoring study, growth rates, number of mussels consumed, and the number of broken mussel shell pieces were determined. Daily consumption rate of mussels by each crab was recorded as 11.115, 11.104, and 11.107 mussel/crab in the 3 experimental groups, respectively. The consumption rate of mussels per crab was counted as 999.78 over the 90-days experiment. As a result, the findings of this study provide strong evidence that P. ibericum can be used for

Download Full-text

Variation of Water Quality in Fish Farm Using Recirculating Aquaculture System for Fancy Carp

Journal of the Korean Society for Environmental Technology ◽

10.26511/jkset.19.1.5 ◽

2018 ◽

Vol 19 (1) ◽

pp. 37-45

Author(s):

Woo Jin Lee ◽

Seon Woo Baek ◽

Ha Na Seo ◽

Byeong Wook Kong ◽

Deog Gwan Ra ◽

...

Keyword(s):

Water Quality ◽

Fish Farm ◽

Recirculating Aquaculture System ◽

Recirculating Aquaculture ◽

Aquaculture System

Download Full-text

Analysis of microbial community structure in an integrated pond recirculating aquaculture system

Journal of Fishery Sciences of China ◽

10.3724/sp.j.1118.2011.00407 ◽

2013 ◽

Vol 18 (2) ◽

pp. 407-415

Author(s):

Yandan YAO ◽

Gu LI ◽

Ling TAO ◽

Xiaoli LI ◽

Shiyang ZHANG ◽

...

Keyword(s):

Community Structure ◽

Microbial Community ◽

Microbial Community Structure ◽

Recirculating Aquaculture System ◽

Recirculating Aquaculture ◽

Aquaculture System

Download Full-text

Denitrification Control in a Recirculating Aquaculture System—A Simulation Study

Processes ◽

10.3390/pr8101306 ◽

2020 ◽

Vol 8 (10) ◽

pp. 1306

Author(s):

Pedro Almeida ◽

Laurent Dewasme ◽

Alain Vande Wouwer

Keyword(s):

Carbon Source ◽

Carbon Sources ◽

Aquatic Organisms ◽

Operating Conditions ◽

Toxic Substances ◽

Recirculating Aquaculture System ◽

Treatment Technology ◽

Tuning Method ◽

Recirculating Aquaculture ◽

Aquaculture System

The recirculating aquaculture system (RAS) is a land-based water treatment technology, which allows for farming aquatic organisms, such as fish, by reusing the water in the production (often less than 5%). This technology is based on the use of filters, either mechanical or biological, and can, in principle, be used for any species grown in aquaculture. Due to the low recirculation rate, ammonia accumulates in the system and must be converted into nitrate using nitrification reactors. Although less toxic for fish, nitrate can also be further reduced into nitrogen gas by the use of denitrification biofilters which may create several issues, such as incomplete denitrification, resulting in toxic substances, such as nitrite and nitric oxide, or a waste of carbon source in excess. Control of the added quantity of carbon source in the denitrification biofilter is then mandatory to keep nitrate/nitrite concentrations under toxic levels for fish and in accordance with local effluent regulations, and to reduce costs related to wasted organic carbon sources. This study therefore investigates the application of different control methodologies to a denitrification reactor in a RAS. To this end, a numerical simulator is built to predict the RAS behavior and to allow for the comparison of different control approaches, in the presence of changes in the operating conditions, such as fish density and biofilter removal efficiency. First, a classical proportional-integral-derivative (PID) controller was designed, based on an SIMC tuning method depending on the amount of ammonia excreted by fish. Then, linearizing and cascade controllers were considered as possible alternatives.

Download Full-text