A system for grading aquatic organisms, the system comprising: a process line having: concentration control means configured to control a concentration of the organisms in water; a grading unit coupled to an output of the concentration control means, the grading unit comprising at least: a pump ; and a grader having chambers each with an adjustable slit; and a counter at an end of the process line, the counter being configured to count organisms; flow measurement means at the counter, configured to measure fluid flow speed; two or more receptacles at the end of the process line, the receptacles for receiving aquatic organisms from the grader ; and a central control system , wherein the counter and the flow measurement means are configured to send information to the central control system on a performance of the grading process, and wherein the central control system is configured to compare the information to data stored in a database and send feedback signals to adjust settings of each individual component of the grading unit , including adjusting based on the feedback signals a speed of the pump and a slit setting of the grader , during the grading process to optimize the grading process. a process line having: concentration control means configured to control a concentration of the organisms in water; a grading unit coupled to an output of the concentration control means, the grading unit comprising at least: a pump ; and a grader having chambers each with an adjustable slit; and a counter at an end of the process line, the counter being configured to count organisms; flow measurement means at the counter, configured to measure fluid flow speed; two or more receptacles at the end of the process line, the receptacles for receiving aquatic organisms from the grader ; and concentration control means configured to control a concentration of the organisms in water; a grading unit coupled to an output of the concentration control means, the grading unit comprising at least: a pump ; and a grader having chambers each with an adjustable slit; and a pump ; and a grader having chambers each with an adjustable slit; and a counter at an end of the process line, the counter being configured to count organisms; flow measurement means at the counter, configured to measure fluid flow speed; two or more receptacles at the end of the process line, the receptacles for receiving aquatic organisms from the grader ; and a central control system , wherein the counter and the flow measurement means are configured to send information to the central control system on a performance of the grading process, and wherein the central control system is configured to compare the information to data stored in a database and send feedback signals to adjust settings of each individual component of the grading unit , including adjusting based on the feedback signals a speed of the pump and a slit setting of the grader , during the grading process to optimize the grading process. wherein the counter and the flow measurement means are configured to send information to the central control system on a performance of the grading process, and wherein the central control system is configured to compare the information to data stored in a database and send feedback signals to adjust settings of each individual component of the grading unit , including adjusting based on the feedback signals a speed of the pump and a slit setting of the grader , during the grading process to optimize the grading process. <EOS>