siebenthalae ( Osteichthyes Osteichthyes Osteichthyes, , Characidae)

Undernaturalconditions,� manyfishspecies,� such� asfreshwatertropical� reofilics,� voluntarilyrestricttheirfoodsupplyd uringtheperiodbeforereproduction.� Maturefemalesfedwithcommercialfoodweredivide dintwogroupsfourmonthsbefore� theirreproductionperiod.�Onegroupwasfedwith�3 %�biomass/dayoffood,�whileforthe� othergroupfoodwasrestricted�50%�ofthatamount. �Duringtwoconsecutivereproductive� cyclesfemalesfrombothgroupswereinducedtospa wn,�andthereproductiveperformance� andvisceralfatindexwerecomparedaswell.�Femal esfromrestrictedtreatmentshowed� betterresultsafterhormonalinjectionandproduce dlargereggsafterspawning,�although� thevisceralfatindexwassignificantlysmaller�(P <0.05).�Thespawnweight,�fertilityand� embryonicsurvivalswerenotdifferentamonggroups �duringthetwoyears.�� � RESUMO.�Efeito da restricao alimentar sobre o desempenho reprodutivo das femeas de yamu Brycon siebenthalae (Osteichthyes, Characidae). Algumasespeciesde� peixes,� taiscomoosreofilicostropicais,� apresent amumarestricaoalimentarvoluntaria� duranteoperiodopre�reprodutivo,� quandoseencont ramnoambientenatural.� Femeas� madurasalimentadascomracaocomercialforamdivid