This study addresses the design and analysis of a compact Remotely Operated Vehicle (ROV) intended for surveying aquatic environments in aquaculture. The geometric dimensions and component placement were initially determined based on allowable weight constraints and buoyancy principles. Hydrodynamic characteristics of the ROV were then evaluated using Computational Fluid Dynamics (CFD) simulations and compared with semi-empirical calculation methods. The CFD analyses provided quantitative assessments of drag, buoyant, and thrust forces, and further enabled evaluation of the influence of fluid flow on thruster positioning—an aspect not feasible through conventional preliminary design approaches. The integrated computational and analytical approach establishes a reliable foundation for optimizing the ROV’s design prior to fabrication, ensuring improved efficiency and operational stability in aquaculture applications.