Repository logo

Browsing by Author "Cruz Casallas, Pablo Emilio"

Now showing 1 - 4 of 4
  • Thumbnail Image
    Item
    Comportamiento reproductivo de Alona sp. y Diaphanosoma sp. (Crustacea: cladocera) bajo diferentes fotoperiodos
    (Corporación Universitaria Lasallista, Editorial Lasallista, 2013) Muñoz Peñuela, Marcela; Otero Paternina, Angélica María; Medina Robles, Víctor Mauricio; Cruz Casallas, Pablo Emilio
    In recent years, native zooplankton has become an alternative source of food in the fish larviculture and nursery processes. Cladocerans are the most used group given their small size, fast development, easy cultivation, susceptibility to pre-dation and high content of digestive enzymes and nutrients. objective. To determine the reproductive behavior of two native cladoceran species from the Colombian Orinoquia (Alona sp. and Diaphanosomasp.) in laboratory and under different photoperiod conditions, measuring some reproductive efficiency variables. Materials and methods. Just born indivi-duals were put, individually, in 6 mL. multicell boxes, which were put into isolated cabins with controlled illumination in order to provide light during 0, 6, 12 or 24 hours. 12 replicates of each treatment were performed. Every 6 h and during 15 days in a row, every individual was observed with the microscope in order to determine the presence of eggs or embr-yos in the incubation chamber and, later, calculate the reproduction variables. results. No significant differences were found between treatments for the variables evaluated in any of both species. conclu-sions. Under the experimental conditions used, it could be seen that the photoperiod has no influence on the reproduction aspects measured in this study for the Alona sp. and Diaphanosoma sp.
  • Thumbnail Image
    Item
    Desarrollo Embrionario del Capaz Pimelodus grosskopfii (Steindachner, 1879)
    (2014-04-03) Valbuena Villarreal, Rubén D; Zapata Berruecos, Beatriz E; David Ruales, Carlos Arturo; Cruz Casallas, Pablo Emilio
  • Thumbnail Image
    Item
    Desarrollo Embrionario del Capaz Pimelodus grosskopfii (Steindachner, 1879)
    (2012) Valbuena Villarreal, Rubén D.; Zapata Berruecos, Beatriz E.; David Ruales, Carlos Arturo; Cruz Casallas, Pablo Emilio
    The knowledge of embryonic development in fish is important in native species with potential for fish farming, by virtue of which it makes possible to identify morphological and chronological events to establish management practices during incubation periods and larviculture. The capaz (Pimelodus grosskopfii) is a species with potential for commercial crop, due to their omnivorous eating habits and acceptance of its meat in the market. To study the embryonic development of the species, sexually mature adult specimens were induced to reproduce with carp pituitary extract (5.75 and 4.0 mgKg-1, females and males, respectively). The inseminated oocytes were incubated in an upward flow system 30 a 27 ± 1 ° C. The samples (n = 30) were collected at the same time of the extrusion, during fertilization, and every 15 minutes starting from 0 to 2 hours post fertilization (HPF) and every 30 minutes from 0 to 2 HPF, and every 30 minutes from 2 to 5 HPF; finally, between 5 HPF and hatching every 60 minutes. The fertilized oocytes had a spherical shape without adhesions and large perivitelline space. Embryonic development took 12 HPF. The differentiation in animal and vegetal pole occurred at 0.2 HPF, the first cleavage at 0.3 HPF, stratified and high blastodisc at 1.8 HPF, flattened blastodisc at 3.3 HPF, the epiboly <50% was observed at 4 HPF, the closure of the blastopore at 5.7 HPF, cranial-caudal differentiation and starting the neurolation at 7 HPF, the differentiation of the optic vesicles, otic and Kupffer's vesicle at 8.5 HPF, tail of the vitelum was released at 10 HPF, first movements were observed at 10.5 and finally hatching occurred at 12 HPF. When the larvae hatched, they showed a total length of 2987±67 µm, without depigmentation, rudimentary digestive system without oral and anal opening and the presence of chromatophores on the yolk sac.
  • Thumbnail Image
    Item
    Reproducción inducida de la sabaleta Brycon henni: revisión bibliográfica
    (Corporación Universitaria Lasallista, 2015-08-24) Lenis Sucerquia, Gustavo Adolfo; Cruz Casallas, Pablo Emilio; David Ruales, Carlos Arturo
    “Sabaleta” fish, Brycon henni, is an endemic species from the mountain zones of Colombia, which adapts itself well to temperate and warm waters. Given its cultural importance in the life zones associated to its presence, several aspects of its biology, its ecology and confined reproduction have been being developed. Despite the fact this species is considered as promising for continental aquaculture, the research works about its induced reproduction reported until 2009 have not achieved satisfactory results. The most recent tests of reproduction in captivity are expected to contribute to the development of this species ´ cultivation.