Effects of sea louse chemotherapeutants on early life stages of the spot prawn (Pandalus platyceros)
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| Authors: | Mill, K; Sahota, C; Hayek, K; Kennedy, CJ |
| Year: | 2021 |
| Journal: | Aquac. Res. Article Link (DOI) |
| Title: | Effects of sea louse chemotherapeutants on early life stages of the spot prawn (Pandalus platyceros) |
| Abstract: | The effects of five salmon aquaculture anti-sea louse chemotherapeutant active ingredients [azamethiphos (AZ), hydrogen peroxide (HP), emamectin benzoate (EB), cypermethrin (CP) and deltamethrin (DM)] were examined in five life stages (egg, Stage I, Stage III, Stage V and juvenile) of Pacific spot prawn (Pandalus platyceros) for two exposure durations (1-h and 3-h). Endpoints affected by exposures to chemotherapeutants included morbidity in all life stages, egg hatch success, hatchling fitness, latency to moult between successive stages and survival to the juvenile stage. Across life stages, 1-h and 3-h median lethal effect concentrations on morbidity ranged from 73 to 809 mg/L HP; 10-236 mu g/L AZ; 321 to >1200 mu g/L EB; 0.1 to >5 mu g/L CP; and 12 to >1000 ng/L DM. Across endpoints, DM was the most toxic, followed by CP, AZ and EB, followed by HP, which was generally observed to be the least toxic regardless of endpoint examined. The embryo and juvenile life stages were generally more resilient to effects than any larval life stage. Longer duration (3-h) exposures were generally more potent than shorter (1-h) exposures, with up to a threefold greater magnitude of effect when these exposure time frames were compared. Considering predicted environmental concentrations, the estimated greatest risk to ELS spot prawns was observed to be posed by DM, followed by CP, AZ and then EB, with a variable relative risk of HP across different endpoints/life stages. |
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