Browsing by Author "Shaik, A.S."

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    A Review on Nearshore and Offshore Fish Cage Developments in Open Seas
    (Springer Science and Business Media Deutschland GmbH, 2024) Shaik, A.S.; Thuvanismail, N.
    Despite the fact that cage culture has been in practice for centuries, commercialization has only begun in the last few decades. Farmers are keen to relocate to offshore locations since most nearshore sites are entirely utilized, with limited potential for additional fish production and environmental groups are raising concerns about pollution, conservation, and recreation. The cage culture system classifies into nearshore and offshore farming. In this review, the nearshore cage system investigates on cage materials, classifications, and net shapes. It provides a brief overview of cage deformation, velocity reduction, cage hydrodynamic features, motion responses, mooring line tension of single cage and grid system. The definitions of offshore and the design challenges that must overcome to relocate offshore are discussed. The offshore system analyses distinct designs in open cages depending on submergence depth and closed contaminant tanks under harsh environmental conditions. An assessment is carried out on experimental studies, in-situ tests, and numerical and analytical methods of the cage culture system. The evolution, development, and present scenario of sea cage culture in India are also reviewed. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd 2024.
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    Numerical Investigation on Different Configurations of Offshore Fish Cages in Submerged Conditions Subjected to Regular Waves
    (Editorial Board of Journal of Harbin Engineering, 2023) Shaik, A.S.; Thuvanismail, N.; Vijayakumar, M.; Kumar, P.
    The present research work concerns about the hydrodynamic behaviors of the open net offshore fish cages of single, double and 4-cage systems subjected to regular sinusoidal waves. The open net semisubmersible rigid cage is square in shape and analyzed numerically using ANSYS AQWA software. Frequency and time domain analyses are carried out for each case. The hydrodynamic parameters such as added mass, radiation potential damping, motion responses and mooring line tensions are considered as performance indicators to conclude as the best arrangements among three different cages. The single cage and windward side of all cages exhibit identical performance in all hydrodynamic parameters. The leeward side of each cage shows lesser parametric values than the windward side cages. Based on the performance indicators, it is concluded that the grid system containing four cage arrangements provides better performance than three other cage configurations. An experimental model of 1: 75 scale is fabricated and wave flume studies are conducted to validate the present numerical model. The cage is placed at a water depth of 55 cm and subjected to wave heights of 12 cm and 14 cm with wave periods ranging from 0.8 s to 2.2 s with an interval of 0.2 s are considered. The same wave flume boundary conditions are adopted for numerical simulations and results are in good agreement with experimental work results. © 2023, Harbin Engineering University and Springer-Verlag GmbH Germany, part of Springer Nature.