The aim of this study was to evaluate the body pigmentation of Cryphiops caementarius with diets supplemented with marigold (Calendula officinalis). Male shrimp were collected from the Pativilca river (Lima, Peru) and cultured in the laboratory in individual containers installed inside eight glass aquariums (55 L). One shrimp was stocked in each individual container and there were six culture containers in each aquarium. The experimental treatments were diets supplemented with 0, 100, 200 and 300 mg/kg of marigold flower flour. Each diet had two repetitions. The pigmentation of epidermal chromatophores and the carotenoids of the shrimp body were determined at 15 and 30 days. The total concentration of carotenoids in shrimp from the natural environment was 9.47 mg/kg. A higher pigmentation of the shrimp body was obtained w...

            The aim of this study was to evaluate the body pigmentation of Cryphiops caementarius with diets supplemented with marigold (Calendula officinalis). Male shrimp were collected from the Pativilca river (Lima, Peru) and cultured in the laboratory in individual containers installed inside eight glass aquariums (55 L). One shrimp was stocked in each individual container and there were six culture containers in each aquarium. The experimental treatments were diets supplemented with 0, 100, 200 and 300 mg/kg of marigold flower flour. Each diet had two repetitions. The pigmentation of epidermal chromatophores and the carotenoids of the shrimp body were determined at 15 and 30 days. The total concentration of carotenoids in shrimp from the natural environment was 9.47 mg/kg. A higher pigmentation of the shrimp body was obtained w...

El objetivo fue evaluar el efecto dietario de diferentes concentraciones de harina de Marigold (Calendula officinalis) en la pigmentación de camarones machos adultos de Cryphiops caementarius. Se utilizaron camarones procedentes del Río Pativilca - Región Lima, de 6,50 cm y 9,23 g. Se emplearon: Dietas con 0, 100, 200, 300 mg kg-1 de harina de flor de marigold, cada uno con cuatro repeticiones. Se utilizaron 8 acuarios de vidrio 55 L de volumen útil. Se emplearon recipientes individuales de cultivo dentro de los acuarios con sistema de recirculación de agua tipo air-water-lift con filtro biológico de goteo. En cada recipiente individual se sembró un camarón (32 camarones m-2). La dieta con 300 mg kg-1 con harina de flor de marigold ocasionó mayor pigmentacióne intensa coloración tanto en crudo como en cocido. En el experimento se demostró que la inclusión de harina de marigo...

The aim of the study was to evaluate the effect of electrical stimulation on the expulsion of Cryphiops caementarius spermatophores according to size and molting stages. Male prawns from 3.0 to 10.8 cm total length, caught in the Lacramarca River (Ancash, Peru) and kept in aquariums (55 L) were evaluated. For spermatophores expulsion, electric shocks of 4 V (n=15), 6 V (n=12) and 8 V (n=6) were applied on the coxopodites of the fifth pair of periopods (1-3 s and for 2-3 times). Spermatophores expulsion was achieved with 4 to 8 V, independent of the size of the prawn, but there was greater expulsion with 6 and 8 V in specimens of 5-8 cm in size and in C, Do and D1 molting. There was no expulsion of spermatophores in molting B prawn with any electrical stimulus.