Respuesta de la actividad enzimática digestiva al incremento gradual de la salinidad en el cangrejo de Shanghai maduro, Eriocheir sinensis (Decapoda: Brachyura)

Autores/as

  • Ruifang Wang East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences - School of Life Science, East China Normal University
  • Ping Zhuang East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences - School of Life Science, East China Normal University
  • Guangpeng Feng East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences
  • Longzhen Zhang East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences
  • Xiaorong Huang East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences
  • Feng Zhao East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences
  • Yu Wang East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences

DOI:

https://doi.org/10.3989/scimar.03737.15B

Palabras clave:

cangrejo maduro, enzima digestiva, diferencia por sexo, regulación metabólica, osmorregulación, salinidad

Resumen


Se expusieron cangrejos de Shanghai maduros (Eriocheir sinensis) a agua salobre o agua marina obligatoriamente durante la migración reproductora. A fin de que los ejemplares se adaptaran a esta migración, fue preciso proceder a una reorganización fisiológica y bioquímica. Con objeto de estudiar los ajustes digestivos de carácter bioquímico del Eriocheir sinensisdurante la transformación del agua dulce en agua marina, se analizó la reacción de la actividad en el hepatopáncreas de cinco enzimas digestivas (amilasa, celulasa, pepsina, tripsina y lipasa) a un aumento gradual de la salinidad, desde 0 ppt (agua dulce) hasta 35 ppt (agua marina), en ejemplares maduros machos y hembras. Las enzimas digestivas mostraron un grado de actividad notablemente mayor en el hepatopáncreas de los machos que en el de las hembras, con excepción de la lipasa. En las hembras, la actividad de la amilasa, la pepsina y la tripsina comenzó a reducirse notablemente cuando la salinidad alcanzó las 28 ppt, mientras que la actividad de la celulasa descendió cuando se alcanzaron las 35 ppt; en el caso de los machos, se observó un descenso muy pronunciado de la actividad enzimática digestiva a partir de las 21 ppt, aunque la actividad aumentó a las 14 ppt. La menor actividad enzimática indicaría que la capacidad digestiva de los cangrejos se reduce a niveles elevados de salinidad y que todas estas enzimas digestivas participan en los ajustes digestivos que se producen durante la osmorregulación. El nivel de salinidad inicial que indujo el descenso de la actividad enzimática fue inferior en los machos que en las hembras, lo cual indica que estas últimas mostraron una mayor tolerancia a un nivel elevado de salinidad que los machos desde el punto de vista de la modulación bioquímica del proceso digestivo.

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Publicado

2013-06-30

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1.
Wang R, Zhuang P, Feng G, Zhang L, Huang X, Zhao F, Wang Y. Respuesta de la actividad enzimática digestiva al incremento gradual de la salinidad en el cangrejo de Shanghai maduro, Eriocheir sinensis (Decapoda: Brachyura). Sci. mar. [Internet]. 30 de junio de 2013 [citado 22 de julio de 2024];77(2):323-9. Disponible en: https://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/1457

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