Physiological effects of methyl farnesoate and pyriproxyfen on wintering female crayfish Cherax quadricarinatus

Uri Abdu, Assaf Barki, Ilan Karplus, Shimon Barel, Peter Takac, Galit Yehezkel, Hans Laufer, Amir Sagi

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

Methyl farnesoate (MF), the predominant juvenile hormone-like compound of crustaceans, was found in the hemolymph of female Cherax quadricarinatus crayfish. Administration of MF to C. quadricarinatus females during their winter reproductive arrest period had no effect on reproduction; however, it did have a tendency to accelerate molting. However, since MF caused increased mortality (∼47% survival in the high MF treatment), we were not able to draw definitive conclusions regarding its physiological affect. In contrast, administration of pyriproxyfen, a juvenile hormone analog, did not cause significant mortality (95% survival in the high pyriproxyfen treatment), although it accumulated in high quantities in the hepatopancreas and, to a lesser extent, muscle tissue, ovaries and gills. The highest dose of pyriproxyfen used in this study, 20 μg/gram animal body weight/week, caused a delay in spawning, which became statistically significant from the seventeenth week. This dose of pyriproxyfen caused a tendency of acceleration of molting without any effect on molt increment. The results of this study show that pyriproxyfen does not seem to be toxic to the crayfish, even in relatively high doses, and might affect the energetic balance between molt and reproduction.

Original languageEnglish
Pages (from-to)163-175
Number of pages13
JournalAquaculture
Volume202
Issue number1-2
DOIs
StatePublished - 19 Oct 2001

Keywords

  • Cherax quadricarinatus
  • Crayfish
  • Crustacea
  • Juvenile hormone
  • Methyl farnesoate
  • Molt
  • Pyriproxyfen
  • Reproduction
  • Spawning

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