Setogenesis and characterization of the new moult substages in the freshwater shrimp Palaemon argentinus (Nobili, 1901) (Caridea: Palaemonidae)

Abstract

The moult cycle of crustaceans is continuous and during different stages of this cycle, physiological, biochemical and morphological changes occur. Therefore, understanding the different stages of the moult cycle in the target species becomes critical for a wide range of biological studies. Here we describe the natural cycle changes in the freshwater shrimp Palaemon argentinus and identify two new substages of post-moult, B 1 and B 2 , that are substages occurring before the intermoult, a stage widely used in crustacean studies. Furthermore, we present a more detailed description of stages already known, describing modifications of the structures and its presence or absence in each stage, in conjunction with explanatory pictures. We also indicate the duration for each stage of the cycle, thus expanding our knowledge of the moult cycle and setogenesis for P. argentinus.

Can hypoosmotic shock and calcium influx lead to translocation of aquaporin‐1 in shrimp muscle cells?

“…The animals were acclimated to room temperature (~23°C), with a 12/12 h light/dark photoperiod, fed once a day with commercial fish food (Alcon Basic®). The molting stages were identified through Setogenesis—analysis of the development of the setae of the uropods (Foguesatto, Nery, et al, 2019). Subsequently, the shrimp in premolt (D 2 ) and early postmolt (A) were cryo‐anesthetized and had their abdominal muscle fibers removed (the intestinal tissue and ganglia were also removed).…”