ABSTRACT. PLASMATIC AND BILIAR ION IC CONCENTRATION OF THE FRES HWATERTELEOST FISII PROCHILOD US SCROFA STEINDACIINER (OSTEICIITIIVES, CIIARA CIFORMES), lN RELATION OF MATURATION CVCLE. Body fl uid ionic content of fishes varies wi th ambient. Vari alions in the plasmati c ion ic concentrati on have also been related with sex or malurati on cycl e, once that reproducti on modifi es metaboli c processes. ln tishes, lhe gall bladder is an importanl oSl1loregulatOly organ. So, the present work has been foc used on the relali on of plasmatic and bil iar eleclrolyles with sex and maluralion cyc1e, of lhe teleost fis h Prochilodus scrofa at the resling and mature stages of gonadal cyc1 e. The animais (2 8 males and 30 fe males) were co ll ected at Cac hoeira de Emas (Pirassllnunga, São Paulo) and they were fas ted for three days before the experiments. Detemi nations ofNa -, K+, Mg ++, and Ca ++ were made by spectophotomelly and cr by microlitlllalion. Compari sons of ion ic content belween sex and malUralion cyc1e were assessed lIsing analys is ofvariance and Stlldent-Newman-Kellls lest. ln this work it was seen that in males and fema les at resti ng and mature stages, there are no di fference aI ioni c pl as malic conle nl. K+ conlenlS were higher in lhe bi le ofmalure males lhan in resting ones. Mg ++ bi liar conlenls were higher in resling males than in resting and mature males. Na ' , Ca H e cr contents have no di ffe rence. Na ', K+, Ca +-and Mg ++ contents were higher in the bile than in lhe plasma. CI-content was higher in plasma lhan in bile.Variations related with prote ic synthesis, and another metabolic processes during cyc1e, may be lhe reason of vari ations in lhe biliar ionic conten!. KEY WORDS . Osteichthyes, Characi formes, Proehilodus semfa, bil e, pl asma, ioni c conlent Os teleósteos dul ciaquíco las têm con centração osmótica pl as mática muito superi or à da água do meio; são, portan to, hiperosmóticos em relação ao meio em que vivem e, desta form a, tendem a ganh ar água por osmose e perder íons por
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