Composição lipí­­dica de jundiá, Rhamdia quelen (Siluriformes, Heptapteridae), de duas populações adaptadas a diferentes condições ambientais

Autores

  • Rodrigo Vargas Sección Zoolog-­­a de Vertebrados, Facultad de Ciencias, Universidad de la República Iguá
  • Martín Bessonart Sección Zoolog-­­a de Vertebrados, Facultad de Ciencias, Universidad de la República Iguá

Palavras-chave:

ácidos graxos, peixes, jundiá, Rhamdia quelen, salinidade, DHA, EPA

Resumo

A composição lipí­­dica do músculo de peixes é afetada por fatores intrí­­nsecos (caracterí­­sticas metabólicas, hábitos migratórios, idade) e/ou extrí­­nsecos (habitat, temperatura, salinidade). Em particular, a composição em·ácidos graxos e a relação n3:n6 em diferentes tecidos são afetadas pela salinidade. No presente estudo, indiví­­duos selvagens de jundiá, Rhamdia quelen, foram capturados em dois lugares com condições ambientais diferentes: um rio de água doce (SG) e uma lagoa costeira com significativas variações de salinidade. A composição em ·ácidos graxos do músculo de indiví­­duos das duas populações foi determinada e comparada. Os maiores valores foram registrados em SG, refletindo, possivelmente, a alta disponibilidade de alimento no verão, estação em que os indiví­­duos foram capturados. Neste estudo, o valor da relação n-3:n-6 esteve próximo de 2, caracterizando um peixe de água doce. Porém, quando comparadas as duas populações, observa-se que, em indiví­­duos de SG, o valor da relação n-3:n-6 é inferior ao registrado naqueles de LR. Este fato pode estar associado a condições ambientais e/ou dietas diferentes. Embora os exemplares tenham sido coletados em lugares, estações e condições ambientais diferentes, as relações entre ácidos graxos essenciais do músculo permaneceram constantes. Outros estudos que focalizem estas relações em condições ambientais extremas são necessários para confirmar estes dados e aportar informações para uma adequada formulação de dietas.

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2018-10-30

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Nota cientí­­fica (Short Communication)