Design and Analysis of an Innovative Concept for Submerging Open-Sea Aquaculture System

Milich, Michael; Drimer, Nitai

doi:10.1109/joe.2018.2826358

Cited by 14 publications

(8 citation statements)

References 18 publications

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“…This requires more strength and stiffness due to a higher local bending moment when compared to other pipes filled with ballast water or permanent filler (see Table 4). When the SeaFisher is submerged, maintaining a slight negative buoyancy condition (where the total weight slightly exceeds the total buoyant force) is desirable to keep the submerged structure in a stable condition under the water, similar to other submerged fish case designs, such as SubFlex [17]. However, there should be a means to prevent the submerged structure from sinking further than a prescribed submerged water depth.…”

Section: Sizing Of Seafisher Componentsmentioning

confidence: 99%

“…The other design philosophy is to have smaller, flexible, and submergible fish pens to dodge the powerful surface waves during extreme weather events, making them storm-proof. Examples of such fish pens are SubFlex [16,17], SeaStation [18], and Impact 9 submersible pens [19]. This kind of fish pen is often constructed from high-density polyethylene (HDPE) and possesses a ballasting system to submerge the pen and to re-float it to the water surface [17,20].…”

Section: Introductionmentioning

confidence: 99%

“…Examples of such fish pens are SubFlex [16,17], SeaStation [18], and Impact 9 submersible pens [19]. This kind of fish pen is often constructed from high-density polyethylene (HDPE) and possesses a ballasting system to submerge the pen and to re-float it to the water surface [17,20]. It is important to determine the optimum submerged depth to save ballasting cost and time for re-float.…”

Section: Introductionmentioning

confidence: 99%

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SeaFisher—A Submersible High-Density Polyethylene Offshore Fish Pen

Wang,

Chu,

Baumeister

et al. 2023

JMSE

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Moving offshore for fish farming poses challenges due to the more energetic sea environment. In this paper, a novel offshore fish pen design named SeaFisher has been proposed. The SeaFisher comprises modular cubic pens that are assembled to form a large 2 × n array offshore fish pen. Its frame structure is made from HDPE, making it flexible and durable against the harsh sea environment. Specially tailored connection brackets and connector pods are designed to assemble bundles of HDPE pipes forming the SeaFisher structure. The SeaFisher is moored using a single point mooring to minimize environmental and collision loads, and for improved waste dispersal. More importantly, the SeaFisher possesses ballast tubes positioned on the top surface to allow it to submerge to a desired water depth to dodge the strong surface waves during severe weather events. This paper presents the engineering design details and hydroelastic analysis of the SeaFisher. Based on a hydrostatic analysis, suitable materials were chosen for the various components of the SeaFisher, and the components were appropriately sized up. By using the software AquaSim v.2.17.3, the SeaFisher’s hydroelastic responses under different sea-state conditions were investigated. It is found that the designed SeaFisher structure and mooring system are adequate with respect to strength and stiffness for the considered sea-state conditions of up to 8 m significant wave height and 0.8 m/s current speed. It is expected that the SeaFisher will be a game changer for offshore fish farming due to its cost-effectiveness and ability to survive in severe storms.

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Section: Sizing Of Seafisher Componentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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SeaFisher—A Submersible High-Density Polyethylene Offshore Fish Pen

Wang,

Chu,

Baumeister

et al. 2023

JMSE

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“…Later, a numerical method is developed based on BEM (boundary element method) to validate the experimental results of Oceanfarm 1 and the results were correlated well [13]. Later, studies were conducted on different shaped cages such as vessel-shaped, wellboat, hexagon, octagon, and innovative open net cages [14]- [17]. Further, research has been extended to multipurpose projects like cages combined with waves, wind energy converters, and breakwaters [18]- [21].…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic Analysis of A Semisubmersible Fish Cage With Different Drafts Subjected to Regular Waves

Shaik,

Thuvanismail,

Chekuri

et al. 2023

Recent Experimental and Computational Research in Structural Engineering

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Cage farming has historical roots spanning centuries, while its commercialization has only commenced within the past few decades. The unsustainability of captured fish production leads to the development of the aquaculture industry. The initial practice has been carried out in ponds, rivers and later moved on into sheltered zones of the sea as a part of nearshore farming. Nowadays, farmers are keen to relocate offshore due to space constraints and pollution-related issues. This article presents a hydrodynamic analysis of the semisubmersible square fish cage with a net solidity of 0.26 subjected to regular waves. The cage is studied numerically under different drafts of 17.5cm, 26.25cm and 35cm under regular waves with a water depth of 55cm. Frequency and time domain analyses are performed to investigate the hydrodynamic characteristics of the cage. Each case's motion responses and anchor line tension are studied and results are analysed. The results indicate that the increase in draft depths leads to decreased motion responses and anchor line tensions. The cage behaves well in three different submerged conditions and shows better performance at the draft of 35cm.

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“…Sensor networks assist the monitoring of fish farm cage as mechanic structures that are deployed in hostile open sea scenarios [ 8 ]. Particularly in Europe, offshore engineering knowledge of fish farms comes mainly from salmon aquaculture.…”

Section: Introductionmentioning

confidence: 99%

Design of a Practical Underwater Sensor Network for Offshore Fish Farm Cages

Sosa

Abril

Sosa

et al. 2020

Sensors

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In this paper, we present the design of a practical underwater sensor network for offshore fish farm cages. An overview of the current structure of an offshore fish farm, applied sensor network solutions, and their weaknesses are given. A mixed wireless–wired approach is proposed to mitigate the problem of wire breakage in underwater wired sensor networks. The approach is based on the serial arrangement of identical sections with wired and wireless interconnections areas. Wireless section alleviates underwater maintenance operations when cages are damaged. The analytical model of the proposed solution is studied in terms of maximum power transfer efficiency and the general formulas of the current in their transmitting antennas and sensor nodes are provided. Subsequently, based on simulations, the effects of parasitic resistance across the network are evaluated. A practical underwater sensor network to reach the 30 m depth with sensor nodes distanced 6 m is used to determine the proposal compliance with the ISO 11784/11785 HDX standard in its normal operation. Taking into account the cable breakage scenario, the results from experiments demonstrate the robustness of the proposed approach to keep running the sensor nodes that are located before the short circuit. Sensor node run time is reduced only 4.07% at most using standard values when a cable breakage occurs at the second deepest section.

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Design and Analysis of an Innovative Concept for Submerging Open-Sea Aquaculture System

Cited by 14 publications

References 18 publications

SeaFisher—A Submersible High-Density Polyethylene Offshore Fish Pen

SeaFisher—A Submersible High-Density Polyethylene Offshore Fish Pen

Hydrodynamic Analysis of A Semisubmersible Fish Cage With Different Drafts Subjected to Regular Waves

Design of a Practical Underwater Sensor Network for Offshore Fish Farm Cages

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