A device for sensing well-being of fish includes a rod, a first prong and a second prong extending from the rod, an opto-detector, a circuit and a transmitter. The opto- detector includes at least one light emitting diode (LED) and at least one photo detector aligned with a line of sight of the at least one light LED. The LED is mounted on the first prong and the photodiode is mounted on the second prong. A distance between the at least one LED and its corresponding photo-detector is defined so that fish can swim therebetween. The circuit detects interception of the line of site and counts a number of times that the line of sight is intercepted. The transmitter reports output from the circuit.
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