High-production, minimal-discharge aquaponic systems and methods. In one aspect, a light source includes a Fabry-Perot laser that is operable to generate multimode laser light, an electroabsorption modulator that is configured to selectively absorb and transmit laser light traveling therethrough, and an optical isolator. The forceps include at least one container element having a cavity for receiving a plurality of biopsy samples. Because the complementary FETs are driven by local oscillator signals that are 180 degrees out of phase, the NMOS FET is turned on for at least a portion of the positive cycle of the local oscillator signal and the PMOS FET is turned on for at least a portion of the negative cycle of the 180-degree phase shifted local oscillator signal. The mobile device is de-registered if the mobile device fails to re-authenticate within the shortened registration validity time, and re-registered if the mobile device re-authenticates within the shortened registration validity time.