文摘
Well boat treatments with hydrogen peroxide are used to control sea lice infections on farmed salmonids in many salmon producing countries. A study was performed to investigate the hatching ability of salmon lice egg strings following exposure to hydrogen peroxide in both a field treatment and a laboratory experiment. Egg strings were collected prior to and following exposure to the test compound and subsequently hatched in a laboratory. In the laboratory experiment, the inhibiting concentration of hydrogen peroxide on egg string hatching was investigated by exposures to various concentrations. No hatching was observed after the field treatment with 1750 mg L鈭?#xA0;1 for 31-32 min at 6.4 掳C. Even low concentrations proved to affect the hatching when egg strings were exposed for 36 卤 3 min at 8.0 掳C. No infective larvae were observed after exposure to concentrations above 470 mg L鈭?#xA0;1 in the laboratory study. Thus, the current practice of discharging residual well boat hydrogen peroxide treatment water 3 km from the treatment site seems unnecessary and reduces on-site treatment capacity.