Effects of the sea lice bath treatment pharmaceuticals hydrogen peroxide, azamethiphos and deltamethrin on egg-carrying shrimp (Pandalus borealis)

Marianne Frantzen, Jenny Bytingsvik, Luca Tassara, Helena C Reinardy, Gro Harlaug Refseth, Ellie J Watts, Anita Evenset

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1 Citation (Scopus)

Abstract

This study investigated effects of sea lice pharmaceuticals on egg-bearing deep-water shrimp (Pandalus borealis). Both mortality and sub-lethal effects (behavior, embryo development, and reproductive output) were studied for each of three pharmaceuticals alone and in different sequential combinations. The most severe effect was observed for deltamethrin where 2 h exposure to 330 times diluted treatment dose (alone and in sequential application with hydrogen peroxide and azamethiphos) induced almost 100% mortality within a few days after exposure. Similar effects were not observed for hydrogen peroxide or azamethiphos. However, sequential treatment of hydrogen peroxide and azamethiphos (2 h exposure to each pharmaceutical; 500 times dilution) resulted in >40% mortality during the first week following treatment. No sub-lethal effects or loss of eggs in female shrimp could be related to exposure to the bath treatments. Future studies should investigate potential sub-lethal effects at exposure concentrations close to the no-effect concentration.

Original languageEnglish
Article number105007
Number of pages9
JournalMarine Environmental Research
Volume159
Early online date16 May 2020
DOIs
Publication statusPublished - 1 Jul 2020

Keywords

  • Aquaculture
  • Azametiphos
  • Hydrogen Peroxide
  • Deltamethrin
  • Pandalus borealis
  • Embryo

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