Measurement of organic loading under an open-ocean aquaculture cage, using sediment traps on the bottom

2007 ◽  
Vol 23 (6) ◽  
pp. 661-667 ◽  
Author(s):  
P. Rapp ◽  
W. R. Ramírez ◽  
J. A. Rivera ◽  
M. Carlo ◽  
R. Luciano
Author(s):  
O̸sten Jensen ◽  
Anders Sunde Wroldsen ◽  
Pa˚l Furset Lader ◽  
Arne Fredheim ◽  
Mats Heide ◽  
...  

Aquaculture is the fastest growing food producing sector in the world. Considerable interest exists in developing open ocean aquaculture in response to a shortage of suitable, sheltered inshore locations. The harsh weather conditions experienced offshore lead to a focus on new structure concepts, remote monitoring and a higher degree of automation in order to keep the cost of structures and operations within an economically viable range. This paper proposes tensegrity structures in the design of flexible structures for offshore aquaculture. The finite element analysis program ABAQUS™ has been used to investigate stiffness properties and performance of tensegrity structures when subjected to various forced deformations and hydrodynamic load conditions. The suggested concept, the tensegrity beam, shows promising stiffness properties in tension, compression and bending, which are relevant for development of open ocean aquaculture construction for high energy environments. When designing a tensegrity beam, both pre-stress and spring stiffness should be considered to ensure the desired structural properties. A large strength to mass ratio and promising properties with respect to control of geometry, stiffness and vibration could make tensegrity an enabling technology for future developments.


Aquaculture ◽  
2020 ◽  
Vol 524 ◽  
pp. 735266
Author(s):  
Tyler Sclodnick ◽  
Steve Sutton ◽  
Thomas Selby ◽  
Robert Dwyer ◽  
Langley Gace

2014 ◽  
Vol 88 (1-2) ◽  
pp. 129-137 ◽  
Author(s):  
R.E. Grizzle ◽  
L.G. Ward ◽  
D.W. Fredriksson ◽  
J.D. Irish ◽  
R. Langan ◽  
...  

2004 ◽  
Vol 32 (1) ◽  
pp. 77-94 ◽  
Author(s):  
David W. Fredriksson ◽  
Judson DeCew ◽  
M.Robinson Swift ◽  
Igor Tsukrov ◽  
Michael D. Chambers ◽  
...  

Author(s):  
Barbaros Celikkol ◽  
Judson DeCew ◽  
Kenneth Baldwin ◽  
Stanley Boduch ◽  
Michael Chambers ◽  
...  

2007 ◽  
Author(s):  
J.D. Irish ◽  
S.J. Boduch ◽  
J.C. DeCew ◽  
W. Paul

2010 ◽  
Vol 44 (3) ◽  
pp. 22-35 ◽  
Author(s):  
Daniel D. Benetti ◽  
Gabriel I. Benetti ◽  
José A. Rivera ◽  
Bruno Sardenberg ◽  
Brian O’Hanlon

AbstractWith aquaculture steadily expanding, the need for suitable space has been followed by the development of more efficient, cost-effective, and environmentally sustainable methodologies. Avoiding possible conflicts between the development of commercial aquaculture operations and the environmental impact in coastal areas, utilizing the offshore environment offers the greatest potential for expansion of the industry in most regions throughout the world. Although currents and greater depths generally increase the assimilation capacity and energy of the offshore environment and offer many advantages for aquaculture, a number of challenges associated with developing any activity in the open ocean environment must be taken into consideration. This article summarizes these advantages and challenges, focusing on the first and most crucial step for project development: site selection criteria for open ocean aquaculture. Although most of the concepts and criteria are common to other marine net pen aquaculture operations, we review and present those conditions that are inherent to the open ocean environment and must be considered before developing any offshore aquaculture activity. These encompass basic premises; assumptions; logistics; infrastructure; availability of manpower, services, and materials; legal framework; socioeconomic and political issues; and oceanographic, biological, environmental, and technological criteria. There are no defined set of criteria, as most are interacting and not fixed but interdependent (e.g., depth vs. current velocity). However, suitable sites must meet basic crucial standards summarized here.Site selection is one of the most important decisions for the establishment of a fish farm operation. Satellite images, hydrographic charts, maps, Google Earth, and Geographic Information Systems can all provide important information for preliminary work on site assessment; however, a very careful in situ survey is mandatory to evaluate the suitability of the area.


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