Lethal and sublethal effects of the anti-sea lice formulation Salmosan (R) on the Pacific spot prawn (Pandalus platyceros)
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| Authors: | Mill, K; Kennedy, CJ |
| Year: | 2021 |
| Journal: | J. World Aquacult. Soc. Article Link (DOI) |
| Title: | Lethal and sublethal effects of the anti-sea lice formulation Salmosan (R) on the Pacific spot prawn (Pandalus platyceros) |
| Abstract: | The effects of the aquaculture chemotherapeutant Salmosan (R) (active ingredient [a.i.]: azamethiphos) were examined in Pacific spot prawns (Pandalus platyceros) at three temperatures (5, 11, and 17 degrees C). Post-molt prawns were more sensitive to Salmosan (R) than intermolt prawns; repeated (3x) 1-hr LC50 values for post-molt prawns ranged from 17 (9.3-31 95% confident intervals) to 40 (25-63) mu g/L a.i. while intermolt prawns survived 3 x 1-hr exposures up to 100 mu g/L a.i. Using LC50 values, Salmosan (R) was approximately 2.4 times more toxic at 17 versus 5 degrees C. Temperature significantly altered chemosensory and locomotory behaviors in intermolt prawns with the highest activity at the intermediate temperature. Significant decreases in antennule flicking (84 and 104% over controls) were seen at 17 degrees C after 3 x 1-hr pulse exposures to 50 and 100 mu g/L a.i., respectively. Temperature, but not Salmosan (R), affected molting success: at 17 degrees C significantly lower survival was seen during ecdysis (60% of those at 5 degrees C) and at 5 degrees C, molt time was longer (41 +/- 3 days) compared to 11 degrees C (34 +/- 4 days) or 17 degrees C (21 +/- 4 days). Life stage (molt status) and environmental parameters (temperature) alter the effects of Salmosan (R) to non-target spot prawns. |
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