Abstract
Eel farmers frequently grade their stocks according to body size through screens of mesh or parallel bars. Some eels become either entangled or wedged in the screens which may be distorted by the animals themselves, or by the efforts of the operator to free trapped eels. This stresses and can damage the eels, and it reduces the accuracy, and shortens the life, of the grader. Prototype grading equipment was built around a novel design of tapered grading slat which (a) prevented eels up to 240 g live weight from becoming entangled, and (b) allowed the rapid release of eels that had become wedged between the grading slats. Tests showed the principles of the design to be suitable for use in or out of water and with all sizes of eel from 0·5 to 240 g live weight.
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