Insect Juvenile Hormone Analogues and Their Biological Activity on Sea Lice (Lepeophtheirus salmonis)

Abstract

A number of synthetic compounds that exhibit juvenile hormone activity when tested on the insect species Tenebrio molitor have been shown to inhibit the development of the sea lice species Lepeophtheirus salmonis. The testing was carried out on both isolated nauplius larvae and live Atlantic salmon (Salmo salar).

The antifouling activity of some juvenoids on three species of acorn barnacle, Balanus

“…We have recently reported that certain juvenoids interrupt the metamorphosis of the sea louse, Lepeophtheirus salmonis Krøyer, a crustacean species harmful to fish farming,7 and in the present study we show that some of the same juvenoids affect the metamorphosis of barnacle cyprids as well. For the bioassay we selected three species of acorn barnacle, Balanus balanoides (L.), Balanus improvisus Darwin and B. amphitrite , which all cause fouling of ships and marine installations.…”

“…2 are known from the literature. We have previously described the preparation of compounds 5, 6, 8–11, 15–19 and 21–24 7. The pyridyl ether 7 was prepared according to the literature 8.…”

Transcriptome mining: Multigene panel to test delousing drug response in the sea louse Caligus rogercresseyi

“…In a study of L. salmonis, organophosphates and pyrethroids were observed to inhibit the metamorphosis of the nauplius to a copepodid; a result similar to that observed when using a compound analogous to JH, which would indicate that the binding of these drugs to the receptors of JH inhibit its function (Skattebol et al, 2004). In C. rogercresseyi, a lesser number of transcripts for JH were expressed in samples treated with deltamethrin as compared to azamethiphos.…”

The contrariwise life of a parasitic, pedomorphic copepod with a non‐feeding adult: ontogenesis, ecology, and evolution

“…Evolutionary changes in the hormonal regulation of development can profoundly alter life histories (Gould 1977;Matsuda 1987;Nijhout 1999;West-Eberhard 2003;Truman & Riddiford 2007), and pedomorphosis in thaumatopsyllids likely arose through natural selection acting, directly or indirectly, on the hormonal control of molting and metamorphosis. The endocrine system that regulates those processes in macrocrustaceans is uncomplicated in general outline (Anger 2001;Laufer & Biggers 2001;Charmantier-Daures & Vernet 2004;Laufer et al 2005), and resembles the system in copepods (Charmantier-Daures & Vernet 2004;Irigoien 2004;Skatteb^l et al 2004).…”