Abstract
The relationship between the effective concentration ( C E ) of the anaesthetic MS-222 and body mass was examined at 20°C in porgy ranging in size from 0.00022 g (just after hatching) to 320 g (595 days old). C E was defined as the concentration which required 3–5 min to induce deep anaesthesia in the fish. Values of C E (ppm) increased monophasically with increasing body mass ( W in g), following the equation C E = 79 W 0.0549 ( N = 30, r = 0.936 between log C E and log W). The recovery ratio ( R R in %), i.e., the number of fish as a percentage which recovered after being placed back in ordinary seawater, varied depending on the developmental stage. R R was lowest in fish of around 0.01 g (30 days old), corresponding to the transitional stage between the post-larval and juvenile stage, whereas it was highest (nearly 100%) in the pro-larval stage (about 0.00023 g in size and 0–6 days of age).
Published Version
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