Advancement and synchronization of spawning in Salmo gairdneri and S. trutta following administration of pimozide and LHRH-A

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Advancement and synchronization of spawning in Salmo gairdneri and S. trutta following administration of

pimozide and LHRH-A

Roland Billard

To cite this version:

Roland Billard. Advancement and synchronization of spawning in Salmo gairdneri and S. trutta fol- lowing administration of pimozide and LHRH-A. International Symposium on Salmonid Reproduction, Oct 1983, Bellevue, Washington, United States. �hal-02783569�

Red Lion Inn

BE1,llevue, Washington

3l Oct.-2 Nov. 19-83

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SALMONID

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An International Symposium

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Advancement and Synchronization of Spawoing in Salmo gairdneri and S, trutta FoHowing Administration of Pimozide and LHRH·A

Rolland Billard. P. Reinaud. M. G. Plouidy

B. Breton. Laboratoire de Physiologie des Pois- sons. Jnstitute National de la Recherche Agronomique. Jouy.-en-Josas. France

The spawning of rainbow trout was udvanced by more rhan l month in 60% of females aftcr pimozide injection ( 10 mg/kg body weight} followed by LHRH-A injection ( 1 µglkg) 6 h. Jater.

A..dvancemenf was clearly less marked whcn we injected either LHRH-A or pimozidç alone and when che control.s wcre given only saline solution. Ovum fertility was comparable in a.11 g:roups.

Wilh the aim of avoÎding rwo successtve injeccions, we tried administering pimozide ( 10 mg/kg in an injection) and LHRH·A (implant containing 50 and 5 µ.g/kg body weight) slmur·

taoeously in brown trout during full spawning. The Jayings of females given pimozide plus

LHRH-A were grouped over a 4-day period and those of females gîven onJy pimozide or a blank

implant over 8 days.